Weird white spots on plants of many different species
September 24, 2018 9:14 AM   Subscribe

Powdery mildew?
posted by bibliotropic at 10:06 AM on September 24, 2018 [1 favorite]

Looks like powdery mildew to me. Some plants are more susceptible than others, and its a common part of garden life. I'd take a sterile pair of clippers and remove affected sections. Additionally, air circulation helps prevent it entirely. When plants are left unpruned (or pruned improperly) dense growth causes an environment favorable to powdery mildew, as does a long stretch of grey, rainy weather. If they're not in a cold climate where it's already decidedly fall, they may want to prune out weaker, interior stems in addition to removing affected leaves. Then, follow a good pruning practice going forward. Check out this pruning guide.
posted by missmary6 at 3:25 PM on September 24, 2018

I just had that on alllll my squashes. I pruned the leaves that were most infected and squirted the rest with a dose of one heaping teaspoon of baking soda mixed with 32 ounces of water in a spray bottle. Spritzed once daily for maybe three days? four? Fully cleared up in less than a week.
posted by esmerelda_jenkins at 9:14 PM on September 24, 2018

This is often the result of overhead watering late in the day. Switch to ground watering early in the day and it should help.
posted by eleslie at 10:34 PM on September 24, 2018

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