grape leaves discolored – Xtremehorticulture

Grape Leaf Problems Leafhoppers and Iron

Q. I have been growing grapes for 7 years. Last year and also this year, I have had problems with the leaves. I have attached 2 photos. Can you please tell me what is wrong with my vines? They are still producing grapes. Thank you! Readers grape leaves A. The pictures were a bit hard to see. I think I am seeing two things. One is some strong discoloration between the veins, almost white. The other are some speckling of the leaves all over the leaves. If I am seeing this correctly I think you have some leafhopper damage (speckling) which would be tiny bugs that are jumping all over the place when you are handling the leaves and the other I think is an iron problem. Grape leaf. Speckling is feeding damage from leafhoppers. With the jumping bugs you could have sprayed Spinosad in about May when they were young and you could have knocked the population back. That would have been the same time for controlling skeletonizer and hornworms so you would have hit three pests with an application of this product about one week apart in May. One example of a spinosad spray at a local nursery. The other would be controlled with an iron chelate application to the base of the grape plant in about March, just before new growth. It would be watered in after you applied it. The iron chelate to use would be EDDHA.

Some Defects on Grape Leaves May Be Normal

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Q. Can you tell me what is wrong with the leaves on my Thompson seedless grape vine (see attached picture)? Are there grape leaf miners? What is the best pesticide to use to control these pests? Readers grape leaf looks pretty healthy A. I really did not see too much to be concerned about on the top of the leaf. Make sure you look at the bottom of the leaf, not just the top. Some insect pests will invade the leaves from the bottom. The leaves look pretty normal to me and I do not know of any leaf miners and grapes. However you are getting into the season where you will get grape leaf skeletonizer starting in May. Keep inspecting your leaves and around the next week or two begin spraying your grape leaves with Bt, an organic pesticide. Do this twice about 10 days apart in May. This should eliminate grape leaf skeletonizer as well as hornworm attacks. If these little bugs called leaf hoppers that jump when you walk past your grapevine are problem in the summer months then you might also apply to applications of spinosad around the same time as the BT. Do not mix them in the same sprayer because I am not sure they are compatible together in the same sprayer. Make sure you spray the top of the leaves as well as the bottom of the leaves. This is very important to get good coverage. Good luck.

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