Yes -
We had 1 report from a farm in North Jersey, but I could not find any in the 
fruit. I later picked some ripe Encore on Sept 1 and put them in emergence 
cages. I let them run a full 14 days. And yes, many SWD females and males 
emerged. We have never had these in peaches in NJ, and we still don’t – in 
traditionally sprayed orchards. The difference here is that the one reported 
incidence in Hunterdon County and the recorded emergence from the Encore came 
from fruit that had not been sprayed for about 4 weeks (I still have to look up 
the spray programs). In recent years growers have been using many pyrethroid 
sprays for BMSB control. This year, given the lower BMSB populations, coupled 
with the use of mating disruption for OFM, the insecticide use in a number of 
orchards was much lower. I think what this tells us is that if we get back to a 
true IPM program for peaches, we have to monitor and treat for SWD, at least 
for fruit that is intended for table-ripe markets. We  have to look at this as 
a whole farm practice in that we have to allow for management options if the 
grower also produces other SWD host crops like blueberries, cherries and 
Dean Polk, Fruit IPM Agent (Professor)
Rutgers Agricultural Research and Extension Center
121 Northville Rd.
Bridgeton, NJ  08302-5919
Cell: (609) 902-1134
Office: (856) 455-3100  ext 4116
Fax: (856) 455-3133

From: apple-crop 
 on behalf of Glen Koehler 
Reply-To: Apple-Crop discussion list 
Date: Monday, September 18, 2017 at 1:10 PM
To: Apple-crop LISTSERVER 
Subject: [Apple-Crop] SWD attack on intact peaches

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<>
Our Changing Climate: It's Real, It's Us, It's Bad, Experts Agree. There's Hope

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