Action Thresholds for Potato Leafhopper on Potatoes in Minnesota12

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Abstract
The appropriate action threshold for application of insecticidal sprays to control potato leafhopper, Empoasca fabae (Harris), on potatoes, Solanum tuberosum (L.), appeared to be ca. 10 nymphs/105 leaves. Applying treatments only when leafhopper populations reached 30 or more nymphs/105 leaves resulted in hopperburn and yield reductions. Treating for 10 or fewer nymphs/105 leaves necessitated additional spray applications of minimal incremental value in crop protection, but which can trigger outbreaks of green peach aphid, Myzus persicae (Sulzer). Only 2 spray applications were required when insecticidal applications were timed to coincide with peak nymphal populations in mid-July and mid-Aug. For these studies, essentially single species infestations of potato leafhopper were obtained by inter planting the potatoes with alfalfa strips.

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