Evaluation of Potato Leaf Injury Caused by Leafhoppers, Flea Beetles, and Early Blight1

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Abstract
In connection with insecticide experiments on potatoes in Minnesota, populations of the potato flea beetle, Epitrix cucumeris, and the potato leafhopper, Empoasca fabae, were studied in relation to the amounts of foliage injury and the effects on yields. Almost a constant relationship was observed between flea beetle counts and numbers of leaf holes per square inch. Only relatively large populations of flea beetles caused measurable reductions in yields. The potato leafhopper caused relatively greater yield reductions than the potato flea beetle. The matching method, with the use of mathematically calculated diagrams for comparison, was found to be an accurate and rapid method for estimating the percentages of foliage injury caused by the potato flea beetle, the potato leafhopper, and early blight (Alternaria solani).

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