Plathypena scabra (F.) (Lepidoptera: Noctuidae) Populations and the Incidence of Natural Enemies in Four Soybean Tillage Systems

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Soybeans were planted in four widely used tillage systems (fall-moldboard-plow, fall-chisel-plow, till-plant, and no-till) and monitored for insect populations of the green cloverworm (GCW), Plathypena scabra, (F.), populations, its parasitoids, and the presence of the entomopathogenic fungus, Nomuraea rileyi (Farlow) Samson. Each tillage regime was used to plant soybeans in randomized complete blocks; blocks were replicated three times. Weekly shake-cloth samples were taken in each tillage plot. Each collected GCW larva was maintained singly in a 26-ml plastic snap-top vial containing a soybean leaflet until its death or adult emergence. Analysis of variance detected that significantly fewer (P <0.05) GCW larvae were collected from till-plant and no-till soybean plots than from fall-moldboard-plow and fall-chisel-plow plots during the first year of the study. During the second year of research, no significant differences (P > 0.05) in the numbers of GCW larvae were detected among the tillage systems. The reasons for the differences in GCW larval numbers were not explained by analysis of incidences of natural mortality agents, including N. rileyi.

Document Type: Research Article

Publication date: February 1, 1985

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