ABSTRACT
An infective juvenile nematode slurry of 1.3 billion Steinernema riobravis Cabanillas, Poinar and Raulston per acre was pumped through a polyvinyl chloride pipe manifold directly into furrow irrigation water in a cotton field. Pink bollworm (Pectinophora gossypiella) (PBW) larvae were released onto the soil surface in bottomless buckets 2, 8, 14, 22, 29 and 36 days after nematode application. Prior to each PBW release, the field was either irrigated or had received rain. PBW larvae were recovered 24 hr after each release, held another 24 hr in petri dishes and examined for nematode-induced mortality. Mean percent mortalities ranged from 92.4% at 2 days following treatment to 25.7% at 36 days following treatment.
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