author(s)
Guruprasad B R, Akmal Pasha

abstract
Repellency behavior and insecticidal activities of plant extracts of Ajuga parviflora and Trichilia connaroides were studied against stored product insects viz., the lesser grain borer Rhyzopertha dominica (F.), and the red flour beetle Tribolium castaneum (Herbst). The area preference method and dose-mortality was used to determine the repellency rate and insecticidal activity. The average repellency of the methanol, petroleum ether and ethyl acetate extract concentrate per cm2 of bothplant leaves totally achieved class II, III, class IV and class V repellency respectively at different intervals (2, 4, 8 hours) of time. The methanolic extract of A. parviflora and T. connaroides showed maximum repellency behavior compared to other solvent systems.This extract was also found to be more effective than the commercial product teflubenzuron (No: SZBB291XV) and also more effective than other solvent extracts mentioned above. Our results indicate that the repellency behavior was dose and extract dependent and dose-mortality of the methanolic extract varied depending on the insect species. Moreover, T. castaneum was susceptible to methanolic extract of A. parviflora and R. dominica was more susceptible to T. connaroides extract.