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OSU Extension

College of Food, Agricultural, and Environmental Sciences



July 15, 2021

During our 3rd gardening session at Hope Emergency, we taught participants about the steps of diagnosing plant problems. We also walked through the garden to practice disease identification and determine appropriate management steps. Pictured are examples of powdery mildew and downy mildew on some of the cucumber and zucchini plants. As shown in the images, Downy mildew appears as yellow, chlorotic spots on the top side of the leaves and white, fuzzy sporulation occurs on the undersides. Powdery mildew is the white fuzzy sporulation shown the the upper side of the leaves. Be on the look out for these diseases in your garden and find more details about management at


The pcitured insects are squash bug nymphs. "The adults and nymphs feed by sucking sap from leaves and stems. Feeding causes plants to wilt, and patches of leaf tissue to turn black and dry. Young plants can die, or plants may live but not develop fruit. The squash bug can be a serious pest of winter and summer squash, gourds, and pumpkins but does not usually attack melons or cucumbers. Adults of the squash bug (Anasa tristis) are dark brown, 2/3 inch long. Eggs are brown, shiny, oval, and usually in clusters on the underside of leaves where two veins meet. Nymphs are initially green, later grey. Adults of another species, the horned squash bug (Anasa armigera), are similar but slightly smaller, with lighter colored legs and body, and a pair of short horns near the base of the antennae." More on ID and control can be found at Insect Pests of Cucurbit Crops