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Forages & Grains





Nursery & Forest

Degree Days

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 48F), 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