[Market-farming] Revisiting Raspberry problem

Marlin Burkholder burkholders at glenecofarm.com
Sun Jul 15 23:30:50 EDT 2012

Thanks, Bill, for the details about hatching them out.
When you say there was ³a positive ID in Peoria, IL² 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> 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
> From: market-farming-bounces at lists.ibiblio.org
> [market-farming-bounces at lists.ibiblio.org] on behalf of Marlin & Christine
> Burkholder [burkholders at glenecofarm.com]
> 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 don¹t 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 ³lays eggs in the flowers²,
> 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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