Forages & Grains
Volume 60 Number 4 Date 05/14/2015
ALFALFA WEEVIL - Larvae were collected for the first time this season on May 11 in Sauk County. Alfalfa surveyed in the south-central and southwest areas contained low counts of 1-9 per 100 sweeps in less than 5% of fields checked. Regular sampling for larvae and leaf tip feeding should begin at 300 degree days (sine base 48°F), or by May 18 across the northern half of the state. Scouting should be under way in southern Wisconsin.
PEA APHID - Surveys conducted in the southern half of the state yielded 5-139 aphids per 100 sweeps. The average count for the period of May 7-13 was 45 per 100 sweeps, a moderate increase from 23 per 100 sweeps the week before.
MEADOW SPITTLEBUG - The first nymphs and spittle masses in alfalfa were observed earlier this week. Populations are currently less than two per 100 stems.
PLANT BUG - Representative counts are low and range from 2-28 per 100 sweeps. Small nymphs of the tarnished and alfalfa plant bug species are likely to appear in sweep net collections by late May.
-- Krista Hamilton, DATCP Entomologist