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Forages & Grains





Nursery & Forest

Degree Days

Forages & Grains
Volume 63 Number 2 Date 05/10/2018

ALFALFA WEEVIL - Adult weevils were collected in Dane and Grant counties on May 7 and 8, indicating the start of spring egg deposition in alfalfa stems. The first appearance of larvae is forecasted for May 11 across far southern Wisconsin and May 18 in northern fields.

PEA APHID - Egg hatch was confirmed on May 7. Alfalfa sampled in the southwestern areas contained very low counts of 1-2 aphids per 100 sweeps. Aphid densities in alfalfa historically begin escalating by mid-May and 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 will soon begin feeding on flower buds in Wisconsin apple orchards and strawberry plantings.

-- Krista Hamilton, DATCP Entomologist