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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 65°F. 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 
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