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Cooperative Extension at Highmoor Farm

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Strawberry IPM Newsletter No. 3 – June 3, 2106

Strawberry IPM Newsletter No. 3 – June 3, 2016
Click on photos to enlarge.


Spider Mites Over Threshold in Several Fields

Vegetable and Berry Growers Twilight Meeting
Thursday, June 9, 2016 at 4:00 p.m.
McDougal’s Orchard in Springvale, Maine

Continued dry weather has kept fungus disease pressure very low. Insect populations have also been low this week, but mite pressure has been increasing. Early varieties are now showing green fruit in southern Maine, while late varieties are now coming into bloom.

REMINDER: Twilight meeting, Thursday night
The University of Maine Cooperative Extension and the Maine Vegetable and Small Fruit Growers Association will hold a twilight meeting at McDougal’s Orchard in Springvale on Thursday, June 9 at 4:00 p.m. This will be a joint meeting with the Maine State Pomological Society.  Trevor Hardy of Brookdale Farm and George Hamilton from the University of New Hampshire will be on hand to discuss the latest developments in irrigation equipment for fruit and vegetable growers. We will tour some of the orchard and berry plantings at the farm, courtesy of Ellen and Jack McAdam, and see some of the new deer fence. In addition, we’ll discuss the upcoming season and pest management issues facing vegetable and berry growers this year.  McDougal Orchard is located at 201 Hanson Ridge Road in Springvale, Maine.  You can visit their website at:

Strawberry bud weevil or “clipper” Most fields in Southern Maine are now beyond early bloom stage, when clipper can have an economic impact. However there may be some late blooming varieties in more northern sites that could still see significant damage from clipper; so scout any fields/varieties that have not yet reached full bloom, looking for clipped buds and/or live adults. If there are more than an average of 1.2 clipped buds per two feet of row, or live clippers are present, a spray should be applied. Insecticide options for clipper include Brigade®, Bifenture®, Danitol®, Sevin® and PyGanic®.

Tarnished plant bug activity has been very low this week, with no fields over the recommended spray threshold. The nymphs can still cause damage beyond the bloom stage, so continue to scout for them until the primary (king) berries begin to color. The threshold for nymphs is 4 or more flower clusters infested per 30 clusters sampled. Insecticide options for tarnished plant bug include malathion, Assail®, Brigade®, Bifenture®, Danitol®, and PyGanic®.

Two-spotted spider mites have been over threshold in several fields this week, which is to be expected under prolonged warm, dry conditions. It is important to scout for mites regularly, as they can build up very rapidly. If 25% of leaves sampled  (e.g. 15 out of 60) have any mites, a spray should be applied. Chemical control options for two-spotted spider mites include Acramite®, Savey®, Zeal®, Vendex®, Oberon®, Brigade®, and Danitol®.  Be sure to use enough liquid and pressure in the spray to get good coverage on the undersides of the leaves.

Diseases: Fields in southern Maine are getting ready for a second application of fungicide to prevent gray mold, in anticipation of weekend rains, which could result in fungal spores being released to infect remaining flowers. Two to three sprays of fungicide are typically required to provide good protection. The first spray is usually applied at 5-10% bloom, followed by a second application at petal fall.


David T. Handley
Vegetable and Small Fruit Specialist

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

Maine Cooperative Extension, the Land Grant University of the state of Maine and the U.S. Department of Agriculture Cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.  A Member of the University of Maine System.

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.





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Image Description: Clipper Beetle on Strawberry Bud

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University of Maine Cooperative Extension

Contact Information

Cooperative Extension at Highmoor Farm
52 U.S. Route 202
Monmouth, Maine 04259-0179
Phone: 207.933.2100
The University of Maine
Orono, Maine 04469
A Member of the University of Maine System