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Soybeans
Volume 62 Number 16 Date 08/17/2017


SOYBEAN APHID - Densities have not surpassed the 250 aphid-per-plant economic threshold in any soybean field surveyed by DATCP this season. The statewide average aphid count in 110 fields sampled from July 28-August 16 was only eight per plant, with moderate averages of 50 or more aphids per plant found at only 2% of sites. Aphid populations are expected to decline by late August due to biological controls, reduced nutritional content of soybeans at R5 and beyond, and other environmental factors. Final management decisions for fields in the R5-R5.5 (beginning to mid-seed) stages must be made very soon.

GREEN CLOVERWORM - Larvae of various sizes continue to cause light defoliation of soybeans in the southern and west-central counties. The damage observed in the past week was minor. Populations have been low since the first caterpillars became apparent last month.

JAPANESE BEETLE - This beetle remains common in soybeans over much of the state. Economic defoliation above the 20% threshold for soybeans in the seed-filling stages was observed in five of the 110 fields surveyed in the past three weeks. Although many fields have an abundance of beetles and varying levels of perimeter defoliation, the degree of injury is generally not severe enough to justify treatment.

-- Krista Hamilton, DATCP Entomologist