Ask a Question forum: Is this fungus?

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Jun 10, 2017 3:49 PM CST
I am growing a pumpkin plant (for a large carving pumpkin) on my balcony in a large pot. I am seeing this on some of the leaves. Please see images 1 and 2. The third image is a good leaf for comparison. These pale whitish patches don't look like the fungus I dealt with last year when I tried growing a pumpkin plant. These look more geometric, like they are growing within the boundaries of the 'veins' of the leaves. This doesn't look like any pictures of powdery mildew or downey mildew that I have seen.
Here is some more information if it helps:
- balcony faces east and gets a lot sun until 11:30ish.
- pumpkin was planted in Miracle Grow potting soil and compost/manure.
- 1 to 2 times a week the pumpkin gets Miracle Grow Miracid Acid Loving Plant Food in its water (a 30 nitrogen, 10 phosphate, 10 potash mix)
- leaves are sprayed each day at dusk (7pm or 8pm) with homemade fungicide of 1 teaspoon of baking soda to 1 quart water, plus a few drops of dish soap.

Thank you.

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Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
Jun 10, 2017 6:34 PM CST
Are you sure it isn't residue from your spray? Evening is not generally a good time to wet leaves...especially if they don't dry before dark. Air circulation is usually low at night in my area. Our breezes come from the east in the morning and west in the afternoon. Rarely much air movement at night. Your area may be very different.
N. Ohio (Zone 5b)
Bookworm The WITWIT Badge Moon Gardener Million Pollinator Garden Challenge Native Plants and Wildflowers Roses
Vermiculture Frogs and Toads Birds Lover of wildlife (Raccoon badge)
Jun 12, 2017 11:17 AM CST
Good mystery question.
Looks like a type of leafminer damage.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Jun 12, 2017 12:36 PM CST
Welcome! If the markings are silvery and seem to be part of the leaf it may be normal. Do you know the name of the cultivar so that we can check? This picture is of a pumpkin that gets a silver pattern on the leaves.


It may not be a good idea to spray with baking soda and soap every single evening though.
Jun 12, 2017 8:17 PM CST
Thank you for the responses. It is a Cucurbita Maxima plant (for jack o lantern pumpkins). I think I actually first saw the silvery patches a day or 2 before I started applying the fungicide (baking soda solution). In all other respects the plant seems to be growing well. So perhaps it is just normal. I will continue to watch it but I won't worry about it. I will keep the low leaves from touching the soil with netting and keep weaving the high leaves through a trellis as they grow.

Again, thanks to everyone who replied.
Jun 15, 2017 7:47 PM CST
Sooby, you were right. It's just a few days later and more leaves are showing brighter silver triangular/diamond shapes, just like in your picture of Cucurbita moschata. Totally natural. No worries. I'm even getting blooms now. Thanks for the info.

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