Have you seen galls on the leaves of any of your vines? If the infestation is severe the leaves can become pretty contorted (see image). The galls are caused by insects called phylloxera. These insects seem to prefer certain cultivars more than others, often american or hybrids more so that vinifera. Even though the manifestation of the insect presence is seen now, there is nothing to be done about it this time of year. Control must take place much earlier in the season. Dr. Rebek lists the control options as Admire Pro (imidacloprid), Assail (acetamiprid), Danitol (fenpropathrin), Movento (spirotetramat), and Surround (kaolin clay; this is a chalky barrier). Think right about the time of bloom for control next year.
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- June 18, 2010 at 11:58 am
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- Pest Management
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June 21, 2010 at 11:57 am
I have seen phylloxera on my chambourcin. We had one gall last year this year a few more.
June 21, 2010 at 1:40 pm
Mark:
Even though you have not had serious issues with this pest yet, you might consider treating for it next year if you think it is getting to be a problem.
June 21, 2010 at 2:22 pm
I will do that. I am also seeing more leaf rollers, but we are controling that so far.
July 26, 2012 at 8:14 pm
This was a really helpful photograph to identify a problem in my vineyard right now. As you said I can begin addressing next year. Is there any direct impact on grapes other than reduced photosynthesis ?
July 27, 2012 at 9:30 am
Langdon:
Severe infestations my cause the vine to be stressed. Stressed vines could have poorer cold hardiness than unstressed vines. This may or may not be a serious issue depending on your location. A reduction in photosynthesis may also lead to a reduction in next years fruit, but there may be lots of other factors involved in that as well.
June 24, 2016 at 6:51 am
This is what our vines look like but we want to stop the infestation with non- chemical treatment. In other words NON TOXIC. Any advice or is removing our one vine the best solution? It’s more decorative than productive.
Pegbyars@gmail.com