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Forages & Grains
Volume 63 Number 14 Date 08/02/2018 POTATO LEAFHOPPER - Surveys continue to yield non-economic counts of less than two adults and nymphs per sweep. High populations have been reported in alfalfa in La Crosse County, leading to treatment of a few fields in the past two weeks. Above-threshold counts have not been found by DATCP specialists. Nymphs are still common in sweep nets, and weekly monitoring of the third alfalfa crop throughout August is recommended. GRASSHOPPER - Late-season grasshopper activity is escalating in alfalfa and other crops. Defoliation has become pronounced along field margins since mid-July across the southern two-thirds of the state. 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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