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Title: PINK BOLLWORM LARVAL MORTALITY FOLLOWING APPLICATION OF STEINERNEMA RIOBRAVIS ENTOMOPATHOGENIC NEMATODES IN COTTON FURROW IRRIGATION.

Author
item Jech, Lynn
item Henneberry, Thomas

Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 6/1/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: An infective juvenile nematode slurry of 1.3 billion Steinernema riobravis Cabanillas, Poinar and Raulston per acre was pumped through a polyvinyl chloride pump 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 nematodes induced mortality. Mean percent mortalities ranged from 92.4% at 2 days following treatment to 25.7% at 36 days following treatment.

Technical Abstract: An infective juvenile nematode slurry of 1.3 billion Steinernema riobravis Cabanillas, Poinar and Raulston per acre was pumped through a polyvinyl chloride pump 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 nematodes induced mortality. Mean percent mortalities ranged from 92.4% at 2 days following treatment to 25.7% at 36 days following treatment.