Grapevine - Is this mildew?

**WendyC** · 14-05-2016, 02:29 PM

A photo of the underneath would be handy bug I'm pretty sure that's not mildew. I suspect something (aphid or leaf sucker) damaged the bud before the leaves unfurled. Pick it off if it bothers you.

**jpdw** · 14-05-2016, 02:43 PM

Underside of leaf - you can see a few grey patches.

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**muddled** · 14-05-2016, 03:25 PM

bugs...not mildew.

is it on all the leaves or just one or two?
if only a couple, pick them off and dispose of them (not in your compost)

If its all the leaves then more drastic action may be needed...

**Kirk** · 14-05-2016, 05:36 PM

Not sure but try looking up "vine louse". It leaves gauls on leaves and is/was present in Europe. So would expect that there are occurances of it in the UK.

Nothing I find looks a great match to your picture, so every chance equally that it is not.

Seems that it/they infest the roots, and so the grapes are usually on rootstocks that are resistant. I am guessing they infest the roots, get into and up the plant, form a Gall, hatch and head off to infest another.

Likely going to need a few more images to get a better idea.

I guess it is either just something that lays eggs on leaves and has found your vine suitable - in which case pluck them off or spray or whatever, or it is more serious as in the above.

Is the vine on a rootstock ?? Just in case someone has grown/rooted it from a nice green vine shoot, in which case there will be no resistance.

**jpdw** · 14-05-2016, 09:33 PM

Thanks both for the replies.

It's only on a few leaves ( probably less than 1 in 20 ) so definitely not rampant over the vine. The vine is grafted and was originally purchased from a UK retailer, probably 10 years ago now.

Googling 'vine weavel' links to Phylloxera which i'd definately heard of -- having read the wikipedia page, I dont think what we're seeing on the leaves is what's shown in the wikipedia images. The legions on our vine are less pronounced - more like indentations.

Unless the proportion of infected leaves gets a lot higher, I think we'll go with picking off affected leaves and see what happens.

**Scarlet** · 14-05-2016, 09:50 PM

I think it maybe a mite as Wendy and Muddled has said - Grape gall. Remove the leaves and burn.
Pests and Deseases: show

**jpdw** · 14-05-2016, 10:29 PM

I have an incinerator ( = "bin with hole in the lid" type) on my plot, so burning the bad leaves will be no trouble!

**Scarlet** · 14-05-2016, 10:44 PM

I'd try to make sure you have every one...ive got a leaf miner problem on my conker tree, I try every year to burn as many as possible but I have to wait for them to fall

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Grapevine - Is this mildew?

Grapevine - Is this mildew?

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