Posts Tagged ‘spotted wing drosophila’

Spotted Wing Drosophila Alert: September 29, 2017

Monday, October 2nd, 2017
Male Spotted Wing Drosophila

Male Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

SPOTTED WING DROSOPHILA ALERT: SEPTEMBER 29, 2017

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila numbers were variable from site to site this week, with some locations seeing little change or a slight decrease from last week, while others showed a significant increase. This may be due to the availability of fruit at each site, as the season starts to wind down, spraying at a site, or trap exposure during the recent hot, sunny days. It is important to note, however, that all locations still have drosophila numbers high enough to cause significant damage to any ripening fruit remaining in the fields. (See table below.) Fall raspberries and day-neutral strawberries are very susceptible at this time. We have also had reports of peaches being infested over the past week. Typically, thicker-skinned fruit like peaches, plums and grapes are not very susceptible to spotted wing drosophila unless the skin is cracked or wounded, which provides the flies with easy access to the flesh for egg laying. It is important to keep wounded and rotten fruit out of the field as much as possible. Allowing it to stay on the plant or on the ground will attract more flies and provide food and shelter for more eggs and larvae.

SWD Maggot in Raspberry

SWD Maggot in Raspberry, photo by David Handley

Growers with any ripening fruit should continue protecting their crop against egg-laying drosophila. A minimum spray interval of 5 to 7 days is recommended to keep fruit from becoming infested.

For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog.

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing Drosophila weekly trap catch 9/15/17 Spotted Wing Drosophila weekly trap catch 9/22/17 Spotted Wing Drosophila weekly trap catch 9/29/17
Wells 330 45 527
Limington 734 373 80
Limerick 1771 174 799
Cape Elizabeth 1308 879 204
New Gloucester 383 341 259
Bowdoinham 792 264 746
Dresden 1584 554 2064
Freeport 132 359 111
Poland Spring 1145 1866 2608
Mechanic Falls 48 113 51
Monmouth 470 63 1624
Wales 86 104 450
Farmington 1848 286 440

Spotted Wing Drosophila Alert: September 15, 2017

Friday, September 15th, 2017

SPOTTED WING DROSOPHILA UPDATE: SEPTEMBER 15, 2017

Spotted Wing Drosophila Larvae in Raspberry

Spotted Wing Drosophila Larvae in Raspberry, photo by David Handley

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Trap captures for spotted wing drosophila increased in most locations this week, likely stimulated by some warmer weather from tropical fronts moving through Maine. Fly populations remain well over the tolerance level to prevent fruit infestation. (See table below.) Growers with any susceptible ripening fruit will need to continue protecting their crop against larval infestation. Regular, consistent spray coverage is needed to prevent fruit infestation. At this time, we continue to recommend a minimum spray interval of 5 to 7 days.

There is a possibility that any more tropical storm fronts moving into the region could further increase drosophila numbers. Harvest all ripe fruit regularly and remove any rotten or cull fruit from the field.

Insects in Spotted Wing Drosophila Trap

Insects in Spotted Wing Drosophila Trap, Male SWD Circled, photo by Kaytlin Woodman

For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog.

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 8/31/17 Spotted Wing  Drosophila weekly trap catch 9/8/17 Spotted Wing  Drosophila weekly trap catch 9/15/17
Wells 1256 273 330
Limington 428 568 734
Limerick 237 326 1771
Cape Elizabeth 2968 1308
New Gloucester 272 383
Bowdoinham 1448 449 792
Dresden 103 666 1584
Freeport 56 164
Poland Spring 597 807 1145
Mechanic Falls 65 77 48
Monmouth 681 434 470
Wales 642 122 86
Farmington 1552 1728 1848

Spotted Wing Drosophila Alert: September 11, 2017

Monday, September 11th, 2017

SPOTTED WING DROSOPHILA ALERT: SEPTEMBER 11, 2017

Click on photo to enlarge.

Spotted Wing Drosophila Emerging from Fall Raspberries

SWD Emerging from Fall Raspberries, photo by James Dill

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Our trap captures for spotted wing drosophila did not change significantly in most locations last week, meaning that populations are generally well over the tolerance level to prevent infestation of any soft fruit remaining in the fields. (See table below.) Growers with any susceptible ripening fruit need to continue protecting their crop against larval infestation. Only regular, consistent spray coverage will prevent fruit infestation. At this time, we continue to recommend a minimum spray interval of 5 to 7 days.

We do not expect populations to start to decline until the flies are exposed to several hard frosts. There is a possibility that any tropical storm fronts moving into the region could actually cause a significant increase in drosophila numbers. Keep harvesting ripe fruit regularly and remove all rotten or cull fruit from the field.

For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog.

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 8/23/17 Spotted Wing  Drosophila weekly trap catch 8/31/17 Spotted Wing  Drosophila weekly trap catch 9/8/17
Wells 387 1256 273
Sanford 93 143
Limington 842 428 568
Limerick 217 237 326
Cape Elizabeth 4320 2968
New Gloucester 603 272
Bowdoinham 925 1448 449
Dresden 104 103 666
Freeport 40 56
Poland Spring 304 597 807
Mechanic Falls 16 65 77
Monmouth 415 681 434
Wales 1816 (2 weeks) 642 122
Farmington 1048 1552 1728

 

 

Spotted Wing Drosophila Alert: September 1, 2017

Friday, September 1st, 2017

SPOTTED WING DROSOPHILA ALERT: SEPTEMBER 1, 2017

Male Spotted Wing Drosophila

Male Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Our trap captures for spotted wing drosophila continued to increase this week at nearly all locations. (See table below.) Growers with any susceptible ripening fruit will need to continue protecting against fly egg-laying and larval infestation. Only regular, consistent spray coverage will prevent fruit infestation. We recommend a minimum spray interval of 5 to 7 days.

While cooler evening temperatures slow fruit development, we have seen little impact on spotted wing drosophila activity, thus we expect populations to continue rising, until they are exposed to several hard frosts. Keep harvesting ripe fruit regularly and remove all rotten or cull fruit from the field.

Spotted Wing Drosophila Larva in Blackberry

SWD Larvae in Blackberry, photo by David Handley

For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog.

Other IPM Web Pages
Michigan State University
Penn State University

University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 8/16/17 Spotted Wing  Drosophila weekly trap catch 8/23/17 Spotted Wing  Drosophila weekly trap catch 8/31/17
Wells 41 387 1256
Sanford 115 93 143
Limington 517 842 428
Limerick 159 217 237
Cape Elizabeth 830 4320
New Gloucester 554 603
Bowdoinham 402 925 1448
Dresden 130 104 103
Freeport 50 40 56
Poland Spring 96 304 597
Mechanic Falls 24 16 65
Monmouth 57 415 681
Wales 1816 (2 weeks) 642
Farmington 1048 (2 weeks)

 

 

Spotted Wing Drosophila Alert: August 24, 2017

Friday, August 25th, 2017

SPOTTED WING DROSOPHILA ALERT:  AUGUST 24, 2017

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila trap captures continue to increase as we move later into the season. (See table below.) Such high fly numbers will cause significant infestations of larvae in any ripening soft fruit, especially raspberries, blackberries, blueberries and day-neutral strawberries. Consistent spray coverage of susceptible crops is now necessary to prevent fruit infestation. We recommend a minimum spray interval of 5 to 7 days.

Populations are likely to continue rising as more food is available to the flies. Often it is not until we have experienced several hard frosts that we see populations start to decline. Harvest regularly and often to prevent the buildup of overripe fruit and remove all rotten or cull fruit from the field. Prune out excessive vegetative growth that provides shade and cover for the flies. This will also improve spray penetration.

Spotted Wing Drosophila Larvae in Blueberry

Spotted Wing Drosophila Larvae in Blueberry, photo by David Handley

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 8/10/17 Spotted Wing  Drosophila weekly trap catch 8/16/17 Spotted Wing  Drosophila weekly trap catch 8/23/17
Wells 11 41 387
Sanford 4 115 93
Limington 678 517 842
Limerick 25 159 217
Cape Elizabeth 786 830 4320
Buxton 37 455 641
New Gloucester 1534 554 603
Bowdoinham 130 402 925
Dresden 111 130 104
Freeport 17 50 40
Poland Spring 10 96 304
Mechanic Falls 1 24 16
Monmouth 17 57 415
Wales 429 1816 (2 weeks)
Farmington 272 1048 (2 weeks)
Fayette 37 117 210

Spotted Wing Drosophila Alert: August 17, 2017

Friday, August 18th, 2017
Insects in Spotted Wing Drosophila Trap

Insects in Spotted Wing Drosophila Trap, Male SWD Circled, photo by Kaytlin Woodman

SPOTTED WING DROSOPHILA ALERT: AUGUST 17, 2017

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila trap captures have increased significantly at most locations over the past two weeks. (See table below.) All of the trapping sites are catching numbers that will result in significant infestations of larvae in any ripening soft fruit, especially raspberries, blackberries, blueberries and day-neutral strawberries. Peaches, nectarines and plums may also be susceptible, especially if the fruit have any growth or stem cracks. At this point, a spray schedule of 5 to 7 days apart should be adequate to prevent fruit infestation.

Spotted Wing Drosophila Larvae in Raspberry

Spotted Wing Drosophila Larvae in Raspberry, photo by David Handley

Spotted wing drosophila (SWD) populations are likely to continue rising as more fruit, especially waste fruit becomes available to the flies. Continue to look for fruit flies hovering around fruit and symptoms of premature fruit decay. The flies favor shady, moist regions of the planting. Be sure your insecticide sprays penetrate the outer foliage to reach the interior of the plants. Harvest regularly and often to prevent the buildup of overripe fruit and remove all rotten or cull fruit from the field. Pruning out excessive vegetative growth that provides shade and cover for the flies can also help reduce infestations and improve spray penetration.

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 8/3/17 Spotted Wing  Drosophila weekly trap catch 8/10/17 Spotted Wing  Drosophila weekly trap catch 8/16/17
Wells 12 11 41
Sanford 8 4 115
Limington 233 678 517
Limerick 19 25 159
Cape Elizabeth 65 786 830
Buxton 14 37 455
New Gloucester 780 1534 554
Bowdoinham 128 130 402
Dresden 47 111 130
Freeport 3 17 50
Poland Spring 22 10 96
Mechanic Falls 0 1 24
Monmouth 2 17 57
Wales 85 429
Farmington 123 272
Fayette 8 37 117

Spotted Wing Drosophila Alert: August 3, 2017

Friday, August 4th, 2017
Spotted Wing Drosophila Trap Catch

Spotted Wing Drosophila Trap Catch, photo by Christina Hillier

SPOTTED WING DROSOPHILA UPDATE: AUGUST 3, 2017

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila activity continues to increase at most trapping sites this week. (See table below.) Most of the trap counts are above what we consider potentially damaging to ripening berry crops, especially raspberries, blackberries and blueberries. Research suggests that when 6 to 10 flies are caught in a yeast-baited trap in a week, larvae will start appearing in the fruit. At this point, a spray schedule of 7 to 10 days apart should be adequate to prevent fruit infestation at most locations. However, at sites where higher populations are now occurring (New Gloucester, Farmington, Limerick, Bowdoinham), fruit may need to be under a five to seven-day spray interval to achieve adequate protection.

Spotted Wing Drosophila on Raspberry

SWD on Raspberry, photo by David Handley.

Spotted wing drosophila (SWD) populations are likely to continue rising in the coming weeks. Look for fruit flies hovering around fruit and symptoms of premature fruit decay. Remember, the flies favor shady, moist regions of the planting. Flies can be discouraged by harvesting regularly to prevent the buildup of overripe fruit, removing all rotten or cull fruit from the field, and pruning out excessive vegetative growth that provides shade and cover for the flies.

 

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 7/20/17 Spotted Wing  Drosophila weekly trap catch 7/27/17 Spotted Wing  Drosophila weekly trap catch 8/3/17
Wells 8 12 12
Sanford 6 16 8
Limington 7 21 233
Limerick 4 18 19
Cape Elizabeth 37 68 65
Buxton 3 5 14
New Gloucester 298 600 780
Bowdoinham 28 74 128
Dresden 2 13 47
Freeport 4 10 3
Poland Spring 2 4 22
Mechanic Falls 0 0
Monmouth 5 1 2
Wales 121 78 85
Farmington 9 141 123
Fayette 5 7 8

Spotted Wing Drosophila Alert: July 21, 2017

Friday, July 21st, 2017
Male and Female Spotted Wing Drosophila

Male and Female Spotted Wing Drosophila, image by Alan Kenage, Capital Press

SPOTTED WING DROSOPHILA ALERT: JULY 21, 2017

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

There has been an increase in spotted wing drosophila activity at most trapping sites this week (see table below). Reports from throughout the northeast suggest a similar trend. This is significantly earlier activity than we have seen in recent years, and some of the trap counts are already well above what we consider potentially damaging to ripening berry crops, especially raspberries and blueberries.  Research suggests that when 6 to 10 flies are caught in a yeast-baited trap in a week, larvae will start appearing in the fruit.

We expect that spotted wing drosophila populations (SWD) will continue to build rapidly in the coming weeks as more eggs are laid in the fruit that is now ripening. Growers should set out traps, if you haven’t already. Start protective sprays on any berries that have begun to ripen when more than four spotted wing drosophila flies are caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay. Remember, the flies favor shady, moist regions of the planting.

Insects in Spotted Wing Drosophila Trap

Insects in Spotted Wing Drosophila Trap, Male SWD Circled, photo by Kaytlin Woodman

You can find directions for making a home-made SWD monitoring trap on our SWD blog. An effective commercial trap and bait is now available from Scentry.  The trap is reusable and the bait lasts 4-6weeks.  Cost for both is about $15 plus shipping, it is available from Great Lakes IPM Company (http://www.greatlakesipm.com/).

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

 

Town Spotted Wing Drosophila weekly trap catch 7/6/17 Spotted Wing  Drosophila weekly trap catch 7/13/17 Spotted Wing  Drosophila weekly trap catch 7/20/17
Wells 19 8
Sanford 0 4 6
Limington 4 2 7
Limerick 1 3 4
Cape Elizabeth 19 21 37
Buxton 12 6 3
New Gloucester 3 30 298
Bowdoinham 2 10 28
Dresden 0 0 2
Freeport 2 0 4
Poland Spring 1 2 2
Mechanic Falls 14 5 0
Monmouth 2 4 5
Wales 110 121
Farmington 0 3 9
Fayette 6 3 5

 

 

 

 

Spotted Wing Drosophila Alert: July 17, 2017

Monday, July 17th, 2017
Male Spotted Wing Drosophila

Male Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

SPOTTED WING DROSOPHILA ALERT: JULY 17, 2017

Click on photos to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

We have found numerous spotted wing drosophila (SWD) fruit flies in raspberry and highbush blueberry plantings in Maine over the past week, in nearly every location that we have set up traps (see table below). This information compliments reports from throughout the northeast that SWD is active and in higher numbers much earlier than we have seen in recent years.

Some of the fly counts are already well above what we would consider potentially damaging to ripening berry crops, especially raspberries and blueberries. Research in Maine and other regions suggests that when 6 to 10 flies are caught in a yeast-baited trap in a week, larvae will start appearing in the fruit.

Spotted wing drosophila populations are likely to build rapidly in the coming weeks as more food (fruit) becomes available for the flies, especially if conditions remain warm and we get some rain. Now is the time to set out traps, if you haven’t already. Start protective sprays on any berries that have begun to ripen, when more than four spotted wing drosophila flies are caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.

Research has shown that dry conditions and exposure reduce the number of eggs these insects will lay in the fruit. This supports our recommendations to open up your berry plantings by pruning, especially low growth, as these insects favor dark, moist conditions, close to the ground.

Based on what we know so far about this pest, here are six rules for managing spotted wing drosophila.

  1. Monitor for the flies with traps, and for the larvae in fruit.
  2. Spray regularly and often once flies have been found in the field (1-2/week).
  3. Harvest fruit regularly and often; do not leave any ripe/rotten fruit in the field.
  4. Sort fruit at harvest; do not leave any soft fruit in the container to be sold.
  5. Chill all fruit immediately after harvest to 38ºF (or as close as you can) for at least 12 hours to slow development of any eggs or larvae.
  6. Prune the planting to open up the canopy and create dry, light conditions.

Products that provide good control of drosophila on berry crops include spinosad (Radiant® for strawberries, Delegate® for raspberries and blueberries), Asana®, Brigade®, Danitol®, malathion, Exirel® (blueberries only) and Assail®. Research suggests that adding table sugar to group 4A insecticides, such as Assail®, may improve their effectiveness. The recommended rate would be 1-2 lbs. sugar per 100 gallons of spray. Please check product labels for rates, post-harvest intervals and safety precautions. Keeping fields clean of overripe and rotten fruit will also help reduce the incidence of this insect.

Characteristics of Insecticides for Spotted Wing Drosophila Control

Trade Name Days to Harvest
Blueberry
Days of Residual
Assail® 1 5-7
Mustang Max® 1 7
Bifenture® 1 (3 raspberry) 7
Brigade® 1 (3 raspberry) 7
Danitol® 3 7
Delegate® 3 (1 raspberry) 7
Entrust® 3 (1 raspberry) 3-5
Exirel® 3 (not for raspberry) 5-7
Imidan® 3 (not for raspberry) 5-7

 

drosophila trap

Drosophila Trap, photo by David Handley

A Simple Monitoring Trap for Spotted Wing Drosophila

The trap body is made from a 16 ounce red plastic cup (we use Solo Brand P16RLR). You’ll need one that has a tight fitting lid (we use Solo Brand 626TS). Using a 1/8” hole punch (available through art suppliers), punch about 15 holes in a row around the cup just under the lip about 1/2” apart. Leave about 2” of the diameter of the rim with no holes so that liquid can be poured in and out. Punch a second row of holes just under the first row, to give you a total of 30, 1/8” holes. Use a black permanent marker to paint a 1/2” wide black strip around the cup under the rim, right over the holes you punched. To support the trap, cut a wooden tomato stake down to about 30”. Attach a 4” or larger hose clamp near the top of the stake to act as a cup holder for the trap. (We just punched a hole in the metal band of the hose clamp and attached it to the stake with a flat-headed wood screw.) Place the trap holder in a shady, moist place in or near the fruit planting, with the cup height about 18” off the ground. Fill the trap with 4 to 6 ounces of apple cider vinegar, water + sugar + yeast, or whatever bait you prefer. It is best to add a few drops of unscented soap to break the surface tension of the liquid. Place the lid on the cup to keep rain and critters from getting in, and place the trap in the holder. Adjust the hose clamp so that the trap fits in snugly but the trap holes are not covered up. Empty and re-bait the trap every week. Do not pour out the old bait on the ground near the trap, as this will draw flies away from it.

An effective commercial trap and bait is now available from Scentry. The trap is reusable and the bait lasts 4-6weeks. Cost for both is about $15 plus shipping, it is available from Great Lakes IPM Company (http://www.greatlakesipm.com/).

Other IPM Web Pages
Michigan State University
Penn State University
University of New Hampshire

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.

Town Spotted Wing  Drosophila weekly trap catch 7/6/17 Spotted Wing  Drosophila weekly trap catch 7/12/17
Wells 19
Sanford 0 4
Limington 4 2
Limerick 1 3
Cape Elizabeth 19 21
Buxton 12 6
New Gloucester 3 30
Bowdoinham 2 10
Dresden 0 0
Freeport 2 0
Poland Spring 1 2
Mechanic Falls 14 5
Monmouth 2 4
Wales 110
Farmington 0 3
Fayette 6 3

Spotted Wing Drosophila Update: November 4, 2016

Friday, November 4th, 2016

SPOTTED WING DROSOPHILA UPDATE: NOVEMBER 4, 2016

Click on photo to enlarge.

David Handley, Vegetable and Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted Wing Drosophila Trap Catch

Spotted Wing Drosophila Trap Catch, photo by Christina Hillier

Warmer temperatures and some rain have resulted in an upsurge of spotted wing drosophila trap catches in some locations, while numbers continued a downward trend in others. Once the weather settles into a colder pattern, we expect fly populations will decline rapidly, based on our experience in previous years. Our monitoring sites are done harvesting for the season, and we have removed our traps from the fields. If you still have any fields or high tunnels being harvested, drosophila pose a significant threat to any remaining fruit. A 5 to 7 day spray interval is recommended to prevent infestations of larvae. See the New England Small Fruit Management Guide for pesticide options.

We’d like to thank the farmers who allowed us to set up traps in their fields and share the data with you. Thanks also to our scouts, Lindsey Ridlon, Shannon Buzzell, Hannah Kerrigan, Danielle Murray, and Pat McManus. Special thanks to Christina Hillier for counting all those flies!

Town Spotted Wing Drosophila weekly trap catch 10/21/16 Spotted Wing Drosophila weekly trap catch 10/28/16 Spotted Wing Drosophila weekly trap catch 11/04/16
Limington* 303 301 1,077
Limerick 2,832 1,722 11,472
Wells 677 539 171
Cape Elizabeth 1,976 1,384 347
Bowdoinham 198 132 390
Dresden 4,264 431 2,992
Freeport 109 132 11
Poland Spring 3,336 1,066 442
Mechanic Falls 136 138 104
Monmouth* 4,312 625 232
Wales 176 134 298
Wayne 9,880 5,472 9,592
Farmington 2,376 1,712 968
*unsprayed planting

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME 04259          Orono, ME 04473
207.933.2100                           1.800.287.0279

For more information on identifying spotted wing drosophila (SWD) and updates on populations in Maine, visit our SWD blog.

IPM Web Pages:
Michigan State University
Penn State University
University of New Hampshire

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

The University of Maine is an equal opportunity/affirmative action institution.