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Nursery & Forest

Degree Days

Volume 60 Number 4 Date 05/14/2015

BEAN LEAF BEETLE - The first overwintered beetles were collected on May 11 from Sauk County alfalfa. This insect is inconsequential to alfalfa, but its presence and abundance can be an indicator of soybean defoliation potential. Early-planted soybeans are highly attractive to bean leaf beetles and should be checked for feeding injury beginning at emergence.

SOYBEAN APHID - Egg hatch on buckthorn began by late April and the first soybean aphids of the growing season could begin to colonize Wisconsin soybeans before the end of the month. Documented first detection dates for the soybean aphid in Wisconsin range from May 24 in 2007 to June 9 in 2009.

-- Krista Hamilton, DATCP Entomologist