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Forages & Grains
Volume 62 Number 13 Date 07/27/2017 POTATO LEAFHOPPER - Surveys from July 20-26 yielded below-threshold counts of less than 1.2 leafhoppers per sweep in all sampled fields. The average was 0.5 per sweep. Frequent heavy rains throughout July have apparently reduced populations from the high levels observed several weeks ago. Monitoring third- and fourth-crop alfalfa throughout August is recommended. PLANT BUG - Counts are similar to last week at 0.1-1.5 adults and nymphs per sweep. Most fields contain 0.6 plant bugs or fewer per sweep, a fraction of the economic threshold of five per sweep. Nymphs remain more abundant than adults in alfalfa. PEA APHID - Levels are still very low at less than 0.5 aphid per sweep in alfalfa fields surveyed in southern and central Wisconsin. -- Krista Hamilton, DATCP Entomologist 
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