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Forages & Grains
Volume 65 Number 13 Date 07/30/2020 POTATO LEAFHOPPER - Survey counts for the last two weeks were all below the 2.0 leafhopper-per-plant economic threshold for alfalfa 12 inches and taller, with most sites having averages less than 1.6 leafhoppers per sweep. Nymphs are still common in sweep nets, indicating the potential for population growth. Weekly monitoring of the third alfalfa crop throughout August is recommended. GRASSHOPPER - Late summer grasshopper activity is escalating in alfalfa and other crops. Defoliation has become pronounced along field margins since mid-July. Grasshopper damage to forage crops can be serious at this time of year, especially in new alfalfa seedings and when dry weather slows plant regrowth after harvest. Chemical intervention is not necessary unless populations reach 20 grasshoppers per square yard at the margins or eight per square yard within an alfalfa field. -- Krista Hamilton, DATCP Entomologist 
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