Glen- From work that Dean Polk Rutgers and I did in NJ we know that SWD can 
infest intact peach fruit
His response has more detail. But the answer is yes SWD can be an issue if the 
populations are high enough with alternative sources like Black Cherry, wild 
grapes, grapes, blueberries and many more.


Win Cowgill
Executive Horticultural Advisor Tree Fruit-Phytelligence
Win Enterprises International, LLC
PO Box 143
Baptistown, NJ 08803

> On Sep 18, 2017, at 1:10 PM, Glen Koehler <> wrote:
> Case in Maine that appears to be SWD attack on intact peaches without splits 
> or other prior wounds.  These peaches were ripening on the tree but not 
> over-ripe and no splits etc. for easy drosophila oviposition without having 
> to cut through skin.  Until now it seemed that SWD could only lay eggs in 
> peaches with pre-existing wound.  Have other folks seen SWD infestation of 
> intact peaches?   
> Glen Koehler
> University of Maine Cooperative Extension
> Pest Management Office
> Voice:  Office 207-581-3882,   Cell  207-485-0918
> 491 College Avenue, Orono, ME  04473
> UMaine Apple IPM 
> <>
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