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Medford, Oregon
Jun 7, 2020 6:30 PM CST
Over the past couple of years I have struggled to get my garden to take off. All of my tomato's, zucchini and squash keep getting yellow spots all over the leaves. I have tried different fungicides, changed the watering cycles etc... I'm not sure if its to much watering, a virus or something else. Any insight would be welcomed.

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Name: sumire
Reno, Nevada (Zone 6a)
Jun 7, 2020 9:34 PM CST
That does not look good. Can you show us some pictures of the entire plants and pictures of the underside of the leaves? Last year, did you get any fruit off the affected plants? How did it look? I suspect it is downy mildew.
Medford, Oregon
Jun 7, 2020 10:02 PM CST
A very small yield of zucchini but only about half the normal size. Lots of tomatoes but half of those turned black on the bottom. The squash plant grew like crazy but only produced very small gourds.

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Name: sumire
Reno, Nevada (Zone 6a)
Jun 7, 2020 10:47 PM CST
Downy mildew, whiteflies and blossom end rot....

Okay, so downy mildew and whiteflies both cause the yellow patterning. The best treatment for downy mildew is to rotate where your garden is each year because the fungus persists in the soil. (This is why fungicide didn't work.) Sticky traps are the only thing I've found that works on whiteflies. Make sure that all garden debris is pulled out and cleared away at the end of the season so the flies have fewer places to hide.

Blossom end rot is a calcium deficiency. I noticed that you have egg shells in your garden. That is great except that the roots need to grow through the calcium source to absorb it properly. Crush the shells down to a powder with a food processor or blender so that the calcium can leach out (I wear an N-95 mask for these adventures because breathing egg shell dust isn't good). And then add the shell, blood and bone meals to the root zones (bottom of the planting hole) of your tomatoes next year. You can try and dig it in around the plant now, but there are no easy cures for this year's plants.

Let us know how it goes. I wish I had better news.
Medford, Oregon
Jun 7, 2020 11:06 PM CST
Thanks for the info

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