Watch Leaves for Cucumber Downy Mildew

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Delicious food that comes to mind when I think of this summer holiday includes juicy  watermelon, cucumber and tomato sandwiches, and fried squash and zucchini. Okay, maybe not all of that is the healthiest, but I have to admit it is delicious.

Talk of cucumbers reminds me of an article I read earlier this week. The headline read “Cucumber Downy Mildew Found in Lenoir County in N.C.”. If cucumber downy mildew is in Lenoir County, then it won’t be long before we will have it here in Carteret County. To identify this disease, look for yellow angular spots on the top of the leaves. The spots are angular because the fungus that causes the disease has a difficult time crossing the many veins that criss-cross the leaf. On the underside of the leaf, when looking through a magnifying glass, you may see some gray structures that carry the windblown spores.

This disease can spread fast, causing the plant to completely defoliate, which kills the plant. The best way for a home gardener to control this disease is to get on a spray program rotating a couple different chemicals to keep the disease from getting established. Fungicides containing chlorothalonil or mancozeb that are labeled for use in the vegetable garden should help prevent cucumber downy mildew from becoming established. However, they won’t get rid of it once it has infected the plant.

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