Return to the Florida Gardening Forum | Post a Follow-Up

 o
Need help with grapevine pest...please!

Posted by c9pilot 9b/10a (My Page) on
Mon, Sep 24, 12 at 14:58

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.


Follow-Up Postings:

 o
ugh

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.


 o
RE: Need help with grapevine pest...please!

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.


 o
RE: Need help with grapevine pest...please!

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 control...you're not picking now so I would cut them back for the winter and get on a spray/drench program

Corrie


 o
RE: Need help with grapevine pest...please!

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.


 o
RE: Need help with grapevine pest...please!

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.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Florida Gardening Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here