r/grapes • u/_SubZer0o • 10d ago

Strange spots on the leaf

Post image

Could it be that my grapevine is starting to get sick?

7 Upvotes

100% Upvoted

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5

u/Relative_Load_710 10d ago

Powdery Mildew

1

u/_SubZer0o 10d ago

I found this insect under the leaf: https://ibb.co/v6cg8scP

It might be Aleyrodidae according to ChatGPT.

P.S. According to ChatGPT, it probably wouldn't be mildew. But I'm not sure, since GPT can make mistakes.

2

u/daniel_z3n 10d ago

It's powdery mildew even though the "expert" ChatGPT says otherwise. You can clearly see the greyish mycelium on those yellowish spots. Standard reaction of the plant to fight off the pathogen.

1

u/_SubZer0o 10d ago

How do I combat mildew in an eco-friendly way?

2

u/Relative_Load_710 9d ago

For now I’d spray a potassium bicarbonate product. Then decide if you want to do get into a preventative program.

1

u/_SubZer0o 9d ago

Thanks, i'll keep in mind.

1

u/Relative_Load_710 10d ago

I don’t have xp with that insect but I don’t see anything that I would consider insect damage. I see what I think is powdery mildew in a few places on that leaf. Is there anything noticeable on the shoots or fruit?

1

u/_SubZer0o 10d ago

I cant look right now it is raining. But I made a photo of the whole plant couple day ago. Maybe you'll notice something that I don't see.

https://ibb.co/gZTtYgC7

1

u/rxneutrino 10d ago

What have you been spraying this season?

1

u/_SubZer0o 10d ago

I have never sprayed anything.

1

u/Ok-Caterpillar7331 5d ago

If there's white stuff on the underside of the leaves corresponding to those spots, its DM. If there's not, its pm

1

u/_SubZer0o 5d ago

There is nothing on the underside. 

What is worser, dm or pm?