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Old 05-17-2019, 03:15 PM
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Weedinhoe Weedinhoe is online now
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Default Squash Leaf Problem



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Yesterday while I was watering I found this fungal or whatever problem on one of the two Butterbush plants. They're young, 18 days out from germination with each having two 5" wide leaves, both of which are funked up and have been removed. The several younger leaves are clean... so far.

Front of leaf:



Back of leaf:



Leaf petioles were clean. There seems to be a whitening along the edges of the main veins. I checked photos online last night and it doesn't seem to be septoria or phytopthora. It's almost like a severe angular leaf spot but it came on this plant a lot faster than when angular leaf spot hits my cukes.

Got an e-mail w/photos sent to my extension guy but was just wondering if anyone has seen this before.
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Old 05-17-2019, 04:22 PM
Helion Helion is offline
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I haven't seen that.

Mine usually get like white dust-ish spots on them but still grow good. I also have those squash beetle things too and they don't even manage to do damage like that on the leaves themselves.
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Old 05-18-2019, 09:24 AM
ebjr1967 ebjr1967 is offline
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It appears to be anthracnose.
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Old 05-18-2019, 09:26 AM
ebjr1967 ebjr1967 is offline
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https://www.planetnatural.com/pest-p...e/anthracnose/
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Old 05-18-2019, 10:31 AM
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catfeet catfeet is offline
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Powdery Mildew? The veins and white edging look sort of like that. https://www.almanac.com/pest/powdery-mildew
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Old 05-18-2019, 10:49 AM
Heartlander Heartlander is offline
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Have you looked under the leaves early morning or late evening?

Look for squash bugs and egg clusters.
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Old 05-18-2019, 04:27 PM
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Quote:
Originally Posted by ebjr1967 View Post
Hmmm, could be but I haven't seen:
"The centers of these lesions often become covered with pink, gelatinous masses of spores especially during moist, warm weather."

And it's been hot and very dry the last six days. The plants have received regular spray of Serenade, especially after the last rain.
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Old 05-18-2019, 04:33 PM
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Quote:
Originally Posted by Heartlander View Post
Have you looked under the leaves early morning or late evening?

Look for squash bugs and egg clusters.
None so far, thank goodness! Starting May 1st I begin a daily leaf check patrol for squash bugs/eggs on cucurbits, Japanese beetles on roses and crapes, aphids on peas and beans, Colorado potato beetle on taters and eggplant. Last year the first squash bug egg masses were found on June 1st. Then starting June 1st I start watching for tomato hornworms.
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