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Forages & Grains
Volume 58 Number 10 Date 07/11/2013 POTATO LEAFHOPPER - Counts remain much the same as previously reported. Surveyed fields in Chippewa, Dunn, Eau Claire, Grant, Iowa, Lafayette, Pierce and St. Croix counties contained 0.1-1.9 per sweep, with an average of 0.6 per sweep. Populations in the east-central counties of Calumet, Fond du Lac, Outagamie and Winnebago were lower and varied from 0.1-0.7 per sweep. Economic counts have not been noted in any field checked as of July 10, although nymphs are common and levels in some fields appear to be approaching the 2.0 per sweep threshold for alfalfa taller than 12 inches. PEA APHID - Surveys in the southern, east-central and west-central districts found low aphid counts of less than four per sweep. Populations have declined since mid-June when counts of 6-8 per sweep were standard. The average this week was only 1.5 per sweep. ALFALFA WEEVIL - A few late-stage larvae persist in the second crop, but most have pupated and new adults are appearing in sweep net collections. Larval populations have been reduced to less than one per 20 sweeps and no further problems are anticipated this year. PLANT BUG - Mixed populations are still low at 0.1-1.5 per sweep in 12- to 30-inch alfalfa. Adults are more common than the nymphs, indicating reproduction has slowed for the time being. -- Krista Hamilton, DATCP Entomologist 
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