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Forages & Grains
Volume 62 Number 1 Date 04/27/2017 ALFALFA WEEVIL - Adult specimens were collected in Columbia, La Crosse and Monroe County alfalfa fields on April 24 and spring egg deposition is underway. The first appearance of larvae is predicted for May 2 in southwest Wisconsin, May 9 across the central counties, and May 16 north of Wausau. A mild winter, including an unusually warm February, likely favored overwintering weevil populations statewide. PEA APHID - Egg hatch was confirmed by April 17. Alfalfa sampled this week in the south-central and west-central areas contained very low counts of 1-15 aphids per 100 sweeps. Aphid densities in alfalfa will continue to increase next month and should peak about two weeks before the first harvest. TARNISHED PLANT BUG - Adults of this species are already common in six to 12-inch alfalfa fields. The early levels noted are insignificant for alfalfa, but suggest this fruit pest could soon begin feeding on flower buds in Wisconsin apple orchards and strawberry plantings. -- Krista Hamilton, DATCP Entomologist 
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