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Soybeans
Volume 64 Number 8 Date 06/20/2019 BEAN LEAF BEETLE - Light defoliation was observed in 30% of sites surveyed in the southern two-thirds of the state. Despite widespread feeding injury, less than 5% of soybean plants were affected in the infested fields and very few beetles were found. Treatment specifically for this pest is seldom justifiable, but could be considered in the rare event that defoliation exceeds 40% or for populations of 39 or more beetles per foot of row during the vegetative stages. ROSE CHAFER - These tan beetles with orange-brown spiny legs are appearing on soybeans and corn, and on a wide variety of ornamental and garden plants. Rose chafer pressure is likely to be heaviest in fields on sandy soils and can be expected to continue for 3-4 more weeks. The economic threshold is 30% defoliation for soybean fields in the pre-bloom stages. Defoliation caused solely by the rose chafer is unlikely to reach this level before beetle activity subsides in July. SOYBEAN APHID - Surveys of VC-V2 soybeans found aphids in two of 25 fields sampled during the reporting period ending June 19. Densities ranged from 1-85 aphids per infested plant on 1-8% of plants, based on 100 plants examined per field. Specific counties where the aphids were detected were Columbia and Sauk. -- Krista Hamilton, DATCP Entomologist 
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