grape vine disease & peach trees - Knowledgebase Question

Lyndhurst, NJ (Zone 6A)
Question by joangiovia
June 29, 2007
My grape vine is getting grapes but they are shrivelling up to a hard raisin before the ripen, what can I do for this year and for next year? Do I have to cut the vine back, when do I have to spray it?
My peach tree has a few leaves with i think that leaf curl..when should I spray the tree and with what? Also, is there any way of keeping the squirrels away from eating the peaches???
Thank you for your help

Answer from NGA
June 29, 2007


Based on your description of the fruit turning to "raisins" on the vine, your grapes may be suffering from a fungal disease called black rot. To prevent it, keep the vines well pruned so air can circulate and sunlight can penetrate the vine, keep the around around the vines weeded, and practice good sanitation by cleaning up all prunings and fallen fruit or foliage promptly and disposing of them in the trash. The fungus overwinters on plant debris and reinfects the plant the next year, so the clean-up aspect is very important.

Peach leaf curl must be prevented by spraying in the fall or very early spring, so unfortunately it is be too late to control that now once the symptoms appear.

I would suggest you consult with your local Cornell county extension to make sure this is black rot and peach leaf curl and to get their control recommendations. If a chemical control is recommended, they will have the most up to date information on what to use and how/when to use it for maximum results.

As far as the squirrels, you may be able to net the tree, or you might have success using one of the spray on or granular repellents labeled for squirrels. Read and follow the label directions for applying and reapplying the repellent.

Good luck with your fruit crop!

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