[Market-farming] New Raspberry pest-back again with a vengance

Marlin Burkholder burkholders at glenecofarm.com
Wed Aug 15 15:26:58 EDT 2012

This is Christine describing what I see.
We do not see pests or flies on our raspberries.  One of our pickers saw
some little moths.  I have seen a few bugs which look like squash bugs, but
have extra fuzz on their hind upper legs.
Over the years, we have had the cane bore make the 2 rings around the top
canes and we would break them off and not have damage to canes.  This year,
in addition to some of that, we have whole canes wilting and dying from the
bottom.  They will have a clean break near the bottom of the cane.  When one
goes to remove the cane,  It appears that a bore has laid eggs or cut one
ring around the stalk.
I tried to get the maggots to hatch out, but they molded on the sides of the
plastic jar after 2 weeks.  We are trying again.
Christine & Marlin

On 8/15/12 9:45 AM, "Shoemaker, William H" <wshoemak at illinois.edu> wrote:

> IF it is Spotted Wing Drosophila it is pretty susceptible to insecticides. The
> problem is that you probably have every stage of the insect present; eggs,
> larvae, pupa and adult. You'll need to spray more than once to get them under
> control. Because it has a short life cycle, spraying twice 4-5 days apart may
> be enough, but I suspect another spray may be necessary. But that still
> doesn't address migration of new adults into your patch from adjacent areas.
> You may need to spray continuously to address this pest, perhaps putting on
> new sprays every 5-7 days.
> However, looking at this as an opportunity, if you don't spray you'll lose the
> crop and suffer despair about ever growing it again. Why not turn this into an
> opportunity to learn what works? If the insect is pretty easy to kill, why not
> try several choices, focusing on the least threatening insecticides first? You
> could try Pyganic and Entrust to see how well they control it. These are OMRI
> approved and have a history of some efficacy on a number of insects. You could
> alternate sprays of each, which would reduce the risk of resistance
> development. That's important with an insect like this with a short life
> cycle. You could throw Neem, or Azidarachtin, into the spray cycle to see if
> it works, though I'd be a little concerned about the smell. If you're not
> growing organically, Malathion is effective and shouldn't affect bees.
> Unfortunately I think Pyganic will affect the bees.
> Sorry to hear you're dealing with this again. I'm afraid we all will be before
> long.
> Bill
> William H. Shoemaker,
> Northern Illinois Viticulturist - IGGVA
> Illinois Grape Growers and Vinters Association
> 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: Tuesday, August 14, 2012 8:45 PM
> To: 'Market Farming'
> Subject: [Market-farming] New Raspberry pest-back again with a vengance
> The new no see-um fruit fly which first made an appearance on our Virginia
> farm last summer is back again, with a vengeance!  I had considered spraying
> an insecticide as the crop started into bloom in July but backed off when I
> saw the number and variety of bees and other pollinators on the plants.  I
> opted instead to inspect the plants with a magnifying glass in search of the
> offending flies to see if I could make a positive identification before
> bringing in the bombs.  I never could see anything that looked like the
> spotted wing drosophila which I have been suspecting is the culprit.
> Now the first flush is ripening and at least 90% of the ripe fruit is mushy
> soft, crawling with maggots, and unfit to harvest.  If there is no way of
> rescuing the remaining unripe fruit there will be no reason to attempt
> harvesting any more of the crop.  It looks like we can consider the crop a
> 100% failure.  I am considering bombing them immediately and waiting a week or
> more to begin harvesting.  Anything ripe now or going to ripen within the next
> week or two would be given a goodbye kiss.  Does anyone think this has a
> chance of working?  Would insecticide hitting the infested berries still
> hanging on the vines kill the maggots and help reduce the pest load next year?
> Would I also need to soak the ground under the plants to get maggots on the
> fallen berries?  When are the berries being infested?  At bloom or
> preripening?
> The only professional beekeeper still operating in our county happens to be a
> next door neighbor.  He is struggling with all the new issues confronting
> beekeeping, including ³colony collapse disorder² believed to be caused by
> environmental poisoning.  I do not wish for my activities to contribute to his
> demise!
> Fall red raspberries have in the past been one of our cornerstone income
> generating crops.  Should I attempt a rescue maneuver now or should I write it
> off this year and plan to go after it early next season?
> This thing is hurting us far more than the BMSB invasion that has had everyone
> stewing for the past two years!
> Marlin Burkholder
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