plum curculio on fruit

The plum curculio model:

spray coverage required until 308 DD Base 50 F. after biofix (McIntosh petal fall)

Example:

McIntosh petal fall: May 15, 2008 ------------------------------------>

Begin accumulating DD's (Base 50) from May 18:

curculio model table
Once 308 DD's (Base 50 F.) have been reached, as long as you have insecticide coverage through this date or just after, you have passed the risk of plum curculio injury.(06/10 in the above example.) No further insecticide sprays for plum curculio necessary.

Prepared by Jon Clements, UMass Amherst Extension and the UMass Fruit Advisor

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