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Forages & Grains
Volume 57 Number 20 Date 08/30/2012 POTATO LEAFHOPPER - Surveys conducted in Columbia, Dane, Green Lake, Marquette, Richland and Sauk counties during the final week of August found variable, mostly non-economic populations. Counts were below 2.9 per sweep in all fields sampled and the average was 0.7 per sweep. Nymph counts have declined and significant population increases are not expected for the remainder of the growing season. PEA APHID - Densities have escalated in localized fields. One alfalfa field surveyed in Dane County and two in Richland County contained 10-21 per sweep, the highest populations documented in several weeks. Other sites had fewer than seven per sweep. Pea aphids have been of minor importance this year. GRASSHOPPER - This pest remains abundant in the grassy areas adjacent to alfalfa, but minimal feeding injury is evident beyond the field margins. Alfalfa fields with counts in excess of 3-4 per sweep are unusual in the southern half of the state. --Krista Hamilton, DATCP Entomologist 
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