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Forages & Grains
Volume 64 Number 3 Date 05/16/2019


ALFALFA WEEVIL - Adults are appearing in very low numbers in alfalfa. The first small larvae should be detectable in advanced fields by May 20.

PEA APHID - Surveys this week found very low counts of 1-35 aphids per 100 sweeps. The average was 17 per 100 sweeps. Pea aphid development is favored by cool, dry weather, with populations increasing most rapidly at temperatures around 65F. Heavy early-season aphid density can cause stunting of the first crop and damage to subsequent cuttings. Pea aphids are also suspected of transmitting certain alfalfa virus diseases.

TARNISHED PLANT BUG - Alfalfa sampled in Columbia, Dane, Grant, Green, Iowa, Lafayette and Rock counties had low counts of 1-7 per 100 sweeps. Plant bug abundance in the first-crop alfalfa is an indicator of potential high populations in apples, strawberries and other fruits and vegetables.

-- Krista Hamilton, DATCP Entomologist