[Market-farming] Revisiting Raspberry problem

Shoemaker, William H wshoemak at illinois.edu
Mon Jul 16 14:16:46 EDT 2012


Our state fruit and vegetable entomologist told me about it. I'm not sure about the details, but I respect his opinion. If he thinks it was a positive ID, I have no doubts. We've had a few Brown Marmorated Stink bugs show up too, but Rick believes they were travelers, not from established populations. But its just a matter of time.



Bill

William H. Shoemaker

University of Illinois, Crop Sciences

St Charles Horticulture Research Center

535 Randall Road, St Charles, IL  60174

630-584-7254, wshoemak at illinois.edu<mailto:wshoemak at illinois.edu>

________________________________
From: market-farming-bounces at lists.ibiblio.org [market-farming-bounces at lists.ibiblio.org] on behalf of Marlin Burkholder [burkholders at glenecofarm.com]
Sent: Sunday, July 15, 2012 10:30 PM
To: Market Farming
Subject: Re: [Market-farming] Revisiting Raspberry problem

Thanks, Bill, for the details about hatching them out.
When you say there was “a positive ID in Peoria, IL” how did they do that?  Did they find the adult fly?  What was the damage on the fruit like?
Christine Burkholder


On 7/15/12 9:19 PM, "Shoemaker, William H" <wshoemak at illinois.edu<https://webmail.illinois.edu/owa/UrlBlockedError.aspx>> wrote:

You might be able to raise the maggots into adults to help ID them. You can put them into a clear sealed container, like a Glad plastic snap-top, with some of the berries. Keep them at a mild temp in shaded conditions and they'll form pupas pretty quickly. They'll hatch into adults not long after that. Then throw the container in the freezer and they'll die but be preserved. You should be able to get a good ID after that. I wouldn't rule out Spotted Wing Drosophila. It is a new invasive that had spread quickly across the eastern US. They love soft fruits like raspberries. We had a positive ID in Peoria, IL last Fall, which was a rude shock.



Bill

William H. Shoemaker

University of Illinois, Crop Sciences

St Charles Horticulture Research Center

535 Randall Road, St Charles, IL  60174

630-584-7254, wshoemak at illinois.edu<https://webmail.illinois.edu/owa/UrlBlockedError.aspx>

________________________________
From: market-farming-bounces at lists.ibiblio.org<https://webmail.illinois.edu/owa/UrlBlockedError.aspx> [market-farming-bounces at lists.ibiblio.org<https://webmail.illinois.edu/owa/UrlBlockedError.aspx>] on behalf of Marlin & Christine Burkholder [burkholders at glenecofarm.com<https://webmail.illinois.edu/owa/UrlBlockedError.aspx>]
Sent: Sunday, July 15, 2012 6:08 PM
To: 'Market Farming'
Subject: Re: [Market-farming] Revisiting Raspberry problem

Last raspberry season, Marlin and I wrote about our massive occurrence of  mushy Heritage raspberries on the bottoms.  The berries looked nice on the plant,  when those berries were picked, one could see a liquid inside the bottom of the berry. As the berry ripened, the whole berry got mushy.  Upon microscopic inspection, we could see many white maggots in one berry.  After my picking bucket with seconds of berries set, these little white maggots would crawl out of the raspberries.
Extension folks and others say it is the result of the spotted wing drosophila.  I do not see a correlation with the maggots of the drosophila and what we had.  I have not read any information about what causes the liquid inside the raspberry from which the maggots hatched.  Just a few of our purple raspberries (this season) had that liquid inside the berry.  We don’t have many purple raspberries and they are adjacent to our Hull blackberries.  I read how the red berry mite can keep blackberries red on part of the berry, which I may have seen on some of our blackberries.  We have lots of sap beetles on our overripe blackberries.
I have read that there is a raspberry beetle which “lays eggs in the flowers”, but the hatching or maggots do not seem characteristic of what we saw.
Meredith (who picks and works with us) suggested that it would be helpful if we could take one of those berries and see what hatches out of them.  Does anyone know the best way to do that?
One person from the list responded last year with a similar problem.  Can anyone help in this detective work? Marlin is threatening to spray for the drosophila, and we have never sprayed chemicals on our raspberries in prior years.
Christine Burkholder


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