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What do these yellow spots mean? Toplef10What do these yellow spots mean? 1zd3ho10

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.

What do these yellow spots mean? I22gcj10What do these yellow spots mean? 14dhcg10

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What do these yellow spots mean?

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What do these yellow spots mean? Empty What do these yellow spots mean?

Post  markqz 10/4/2022, 10:29 pm

This is a cucumber leaf. I'm used to mildew. But this seems different. I'm thinking it might mean something's been biting them. Thanks!

What do these yellow spots mean? L7P5WVO
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Post  sanderson 10/4/2022, 11:29 pm

Does anything here look like a possible match? My squash and cucumber leaves are destroyed by aphids, spider mites and/or white flies before any disease has a chance to wreak havoc.

https://plantvillage.psu.edu/topics/squash/infos

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Post  OhioGardener 10/5/2022, 8:25 am

markqz wrote:This is a cucumber leaf. I'm used to mildew. But this seems different. I'm thinking it might mean something's been biting them. Thanks!

Looks like it might be Downy Mildew. Check the underside of the leaf for fuzzy, dark gray spots (spores).

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Post  markqz 10/5/2022, 3:14 pm

OhioGardener wrote:Looks like it might be Downy Mildew. Check the underside of the leaf for fuzzy, dark gray spots (spores).
Thanks! Probably Alternaria leaf blight from Sanderson's list, though I imagine it goes by many local names.
sanderson wrote:Does anything here look like a possible match? My squash and cucumber leaves are destroyed by aphids, spider mites and/or white flies before any disease has a chance to wreak havoc.

https://plantvillage.psu.edu/topics/squash/infos
I've got rollie pollies actually climbing way up in the Cucumbers! They're probably spreading the mildew/fungus.
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