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Soybeans
Volume 63 Number 4 Date 05/24/2018 SOYBEAN APHID - Egg hatch on buckthorn began by early May, and aphid colonization of emerging soybeans could start next week. During the last decade, the first recorded aphid observations have ranged from as early as May 24 in 2007 to as late as June 9 in 2009. In most years, aphids are detectable by the time soybeans reach the V1 stage. BEAN LEAF BEETLE - Overwintered beetles have been found in only four of 73 alfalfa fields sampled this month. The beetles were collected from two fields in Richland County, one in Sauk County, and one in Trempealeau County. The very low number of beetles collected thus far suggests only a minor threat of soybean defoliation in early June. However, the estimated 7% of soybean acres that have emerged as of May 20 are at increased risk of infestation by overwintered adults and should be checked for evidence of beetle feeding. -- Krista Hamilton, DATCP Entomologist 
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