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Field experiments in 1988–1990 determined the (1) effects of defoliation by Pseudoplusia includens (Walker) (soybean looper) or basal stem girdling by Spissistilus festinus (Say) (threecornered alfalfa hopper) on soybean stem canker severity and (2) effects of the soybean looper defoliation on red crown rot incidence. Compared to ungirdled plants, stem canker severity was increased while stem length, stem diameter, and yield were reduced for girdled plants. Stem canker severity, number of perithecia, yield, stem length, and stem diameter were reduced on defoliated soybean, compared to undefoliated soybean. Red crown rot incidence, perithecial production, and yields were reduced on defoliated soybean compared to undefoliated soybean. This suggests different types of insect injury may either increase or decrease the severity of soybean diseases.

journal of entomological science

Interactions Among the Soybean Looper (Lepidoptera: Noctuidae), Threecornered Alfalfa Hopper (Homoptera Membracidae), Stem Canker, and Red Crown Rot in Soybean