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Forages & Grains
Volume 58 Number 2 Date 05/09/2013 ALFALFA WEEVIL - Surveys in alfalfa found adults at the rate of 1-9 per 100 sweeps. Egg deposition is under way across southern Wisconsin where the first weevil larvae could appear in sweep net collections next week. Routine field scouting is advised beginning at 300 degree days (base 48°F), or about May 15 in the southern counties, May 21 in the central counties and May 24 in the north. PEA APHID - Alfalfa sampled in Grant, Iowa, Lafayette, Richland, Sauk and Vernon counties showed low counts of 1-24 aphids per 100 sweeps. TARNISHED PLANT BUG - Adults can be found in most alfalfa fields in the southwest area of the state. The average count in the last week was two per 100 sweeps. ENGLIGH GRAIN APHID - Migrants were swept in from alfalfa in very low numbers, ranging from 1-3 per 100 sweeps in Richland and Vernon counties. None were found in the other fields surveyed in southwestern Wisconsin. This migratory pest of small grains seldom reaches economic levels, but it is a vector of both cereal yellow dwarf virus and barely yellow dwarf virus. -- Krista Hamilton, DATCP Entomologist 
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