Need help with grapevine pest...please!

c9pilot(9b/10a)September 24, 2012

Our grapevines, from which we have already harvested this year, started going into a steep decline about a week or ten days ago. It started at one end and at first we thought it was a problem with just the one plant (second from the end) or a problem with the last sprinkler head on the run, but now it is really spreading fast down the line.

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Danged computer froze up before I could post the second picture....I'll put a close up as soon as the stupid thing finishes booting up.

    Bookmark   September 24, 2012 at 3:03PM
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So here's the close-up picture of one of the leaves and you can see the tiny black specks that are some sort of pest - they're smaller than fleas but they jump around when I touch them. The browner leaves (more infected) have dozens or hundreds of them, mostly on the underside of the leaves.
No holes or chewing on the leaves - they just start with brown spotting then turn all brown and dead and fall off.
Any ideas what they are and what I need to do?
My google search didn't yield anything remotely like this.

    Bookmark   September 24, 2012 at 3:13PM
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That looks exactly like grapevine aphids...
..they almost made me stop growing grapes

c9, search google for "grapevine aphid"..

they can also destroy the roots of cultivated grapes

I had to resort to systemics/imidacloprid to finally get mine under're not picking now so I would cut them back for the winter and get on a spray/drench program


    Bookmark   September 24, 2012 at 8:13PM
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Thanks, Corrie.
From the pictures I found online, the grapevine aphids looked tan-brown and these are dark black, and the regular old aphids that I'm used to are much bigger, maybe poor googling on my part, but I've got to do something.
They're my hubbie's grapes so hopefully I can get him to follow this advice.

    Bookmark   September 25, 2012 at 6:59AM
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Maybe they are some kind of mite? Either way, it's time to spray. I'd try some insecticidal soap, neem oil (works great on mites if that's what it is), or some paraffin oil. You do need to do something ASAP though. It looks bad! FWIW I had mango scales bad.. Neem didn't do much but parra f'in knocked em out in two treatments two days apart.

It's too late for a systemic now. They'll be toast by the time it's up taken.

    Bookmark   September 29, 2012 at 4:34PM
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