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Forages & Grains
Volume 63 Number 1 Date 05/03/2018 ALFALFA WEEVIL - Overwintered adults are resuming activity and spring egg deposition has begun in far southern Wisconsin. Surveys in alfalfa have not yet started as of May 3. The record-setting cold weather of April is expected to delay the first appearance of larvae until May 11 or later. PEA APHID - The degree day accumulation above base 40°F is adequate for hatching of overwintered eggs. Pea aphids were first noted on April 17 last season and are usually active by now. Aphid densities typically increase throughout May and peak about two weeks before the first alfalfa harvest. -- Krista Hamilton, DATCP Entomologist 
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