Efficacy of some aqueous plant extracts against cotton stainers, Dysdercus superstitious (Herrich Schaffer) (Hemiptera: Pyrrhocoridae)

Abstract

The objective of the present study was to investigate the insecticidal efficacy of Bridelia micrantha, Chasmanthera dependens and Vernonia cinerea under ambient laboratory conditions in the management of Dysdercus superstitious (Herrich Schaffer) (Hemiptera: Pyrrhocoridae). The incidence of each aqueous extracts on D. superstitious for repellency and mortality was monitored at 24 h interval for 4 days, while nymph emergence was monitored and recorded. The result indicated that D. superstitious repellency, mortality and nymph emergence were concentration (dosage) and exposure time dependent. Across treatment, dishes treated with 2.0 ml extract significantly (P