253-Cultural and Biological Management for Insects and Diseases in Wild Blueberries

Fact Sheet No.253


Prepared by David E. Yarborough, Extension Blueberry Specialist, The University of Maine, Orono, ME 04469.  Revised June 2017.

Insects Method Comments
Blueberry Maggot Harvesting Harvesting techniques that reduce fruit loss can minimize the number of infected fruit left on the plants and on the ground. Avoid edges as higher infestations occur there.  Allowing infected fruit to drop before harvest will increase fly populations and future losses.
Clean Winnow Piles Compost, burn or dispose of winnower refuse or hot spots of fly emergence will be created.
Keep all fields in same cycle Since 90% of the flies emerge from the previous crop field, having all fields in the same locale will deny flies fruit and reduce maggot infestation.
Flea beetle, Spanworm,
Sawfly
Fire pruning Blueberry litter must be ignited, if too wet then will have incomplete sanitation.
Thrips, Tip midge Fire pruning Burn curled stems as soon as extensive curling occurs in early spring but before June 1.
Biological Control of Spanworm Apply to small early instar larvae for best control. Larval death not immediate, but feeding quickly inhibited. May use when bees pollinating. Do not apply when bees are actively foraging, toxic to bees. Best results occur when applications are made in the evening since sunlight kills the Beauveria spores over time.  Do not apply when bees are actively foraging toxic to bees for 3 hours after application.
BT (Bacillus thuringiensis) Multiple labels
Micotrol-0
(Beauveria bassiana)
1 qt./acre
Entrust 2 oz./acre
Biological Control of Flea Beetle, Strawberry Rootworm Apply at seven to ten day intervals in evening. Flea beetle larvae only.  Best results occur when applications are made in the evening since sunlight kills the Beauveria spores over time. Do not apply when bees are actively foraging, toxic to bees.  Do not apply when bees are actively foraging toxic to bees for 3 hours after application.
Micotrol-0
(Beauveria bassiana)
1 qt./acre
Entrust 2 oz./acre
Insects Method Comments
Monilinia Blight Fire pruning Blueberry litter must be ignited, if too wet then will have incomplete sanitation. Burning can decrease approximately 50% of mummies.  A two-inch layer of mulch put down in prune year will prevent germination of mummies in the following year.
Control of Monilinia Blight  Apply at bud break and repeat every seven to ten days as needed. Please see labels for particular requirements for each material.
Regalia (extract of Reynoutria sachalinensis) 1 to 4 qt./50 to 100 gallons per acre
Serenade Max (Bacillus subtilis) 1 to 3 lbs./acre
Valdensia Spot burn BURN the diseased area and a 10 ft. area outside the edge of the infected stems.  All leaf litter must be burned to ensure eradication of disease.

Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.

© 1994, 2004, 2017

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