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Soybeans
Volume 58 Number 11 Date 07/18/2013 SOYBEAN APHID - Colonies have exceeded the economic threshold in a very small percentage of fields. A report from UW-Madison researchers indicates the first economic population was found in Calumet County on July 11. Average densities at 48 other DATCP sites were well below-threshold at 1-19 per plant. Monitoring of fields should be intensified in all areas of the state as soybeans approach the early reproductive growth stages when aphid populations usually peak. JAPANESE BEETLE - Defoliation was observed at the rate of 1-10% in soybeans in more than half of the 48 fields surveyed in the past week. The most serious infestations were found in Dane and Monroe counties. Leaf injury by the combination of Japanese beetles, grasshoppers, green cloverworms and various other defoliators should not exceed 20% between the bloom and pod-fill stages. GREEN CLOVERWORM - Larvae are beginning to appear in soybeans in the southern and west-central areas. Counts are currently below four per 100 sweeps. Those noted in Lafayette, Monroe and Vernon counties were in the early instars as of July 17. -- Krista Hamilton, DATCP Entomologist 
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