Here is the newest issue of Massachusetts Berry Notes from the UMass Extension Fruit Team.

Massachusetts IPM Berry Blast

March 29, 2016

Heather Faubert, URI Extension

All locations where winter moth eggs are being monitored have at least some blue eggs except eggs in Little Compton. All monitored eggs in Little Compton are still orange. Eggs turn blue about 2 days before hatching. I think it will be another week before eggs start turning blue in Little Compton.
In Kingston & Warwick, RI, Pawcatuck, CT, and Franklin, MA more than half of monitored eggs have turned blue and have been hatching. In Cumberland, RI and Hanson, MA eggs are a bit behind and just started turning blue over the weekend.
If you want to protect apples, pears or blueberries from winter moth caterpillars in any winter moth infested areas (other than Little Compton and other cool areas along the ocean) spray with an insecticide as soon as possible.
I think it is best to wait to spray landscape trees until leaves emerge.

From March 4th message about insecticides:
Winter moth caterpillars are pretty easy to kill, provided they are not inside closed buds. Insecticide choices for when caterpillars start to hatch for fruit growers include, but are not limited to, spinosad, Imidan, Sevin, Malathion and synthetic pyrethroids such as Asana. Spinosad products are Delegate, mostly for commercial growers, Entrust for organic growers, and Captain Jack’s Deadbug Brew is formulated for small-scale growing. Adding a dormant oil may be useful for the first spray of any of the listed insecticides.

Once buds are open, B.t. kurstaki products (Bacillus thuringiensis kurstaki) such as DiPel and Biobit work well. For landscape trees, winter moth caterpillars can be controlled once trees leaf out with spinosad (Conserve), B.t. kurstaki (Dipel Pro, Javelin, and others), as well as synthetic pyrethroids such as bifenthrin. B.t. products are a good choice because they kill only caterpillars, but B.t. products break down in sunlight after 3-5 days so may need to be reapplied more frequently.

Other past messages can be seen at:

Archived IPM Berry Blasts are available at the UMass Extension Fruitadvisor website.
We thank Nourse Farms for their underwriting of this newsletter which allows us to keep subscription rates low.

Our newsletter is presented in Adobe PDF format. To read the newsletter you'll need to download a free utility from Adobe called "Acrobat Reader"
It is available from
Copyright © 2012 UMass Extension, All rights reserved.
Archives at:
Our mailing address is:
Mass Berry Notes, Bowditch Hall/UMass, Amherst, MA 01003