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Forages & Grains
Volume 59 Number 11 Date 07/17/2014 POTATO LEAFHOPPER - Counts in alfalfa remain low to moderate. Surveys conducted in Buffalo, Crawford, Dane, Eau Claire, Iowa, Kenosha, Richland, Trempealeau, Sauk and Walworth counties found a range of 0.1-0.9 adults and nymphs per sweep and an average of 0.5 per sweep. Nymphs now constitute 10-45% of the population in some fields, indicating potential for population increase in the third crop. PEA APHID - Alfalfa fields surveyed in the southern counties contained remarkably low populations of less than 0.3 aphids per sweep or 30 per 100 sweeps. Counts in the west-central area were comparable at less than 0.2 per sweep. Aphid fungal pathogens, which are thought to have caused an abrupt population collapse two weeks ago, are continuing to limit aphid activity. PLANT BUG - Representative counts in the southern half of the state range from 0.1-1.7 per sweep. The average is only 0.3 per sweep, based on a sample size of 27 fields. Nymphs of various maturities are still common in most fields and reports indicate damaging populations are appearing in some apple orchards. -- Krista Hamilton, DATCP Entomologist 
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