Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Control strategy of bean aphid with predator, Menochilus sexmaculatus (F.) and insecticides.

Abstract

Field trials were conducted on the response of the predator, M. sexmaculatus [Cheilomenes sexmaculata], and insecticides to control bean aphid, Aphis craccivora during the bean [Lablab purpureus] growing season in Bangladesh. The predation rate and controlling efficacy were based on the population of aphids in lablab plants. Five larvae of C. sexmaculata caused 73-95% suppression of infesting bean aphids at high densities (490-640) and 86-100% reduction at low densities (105-180) on caged bean plants in 7 days. C. sexmaculata larvae (10 or 15 individuals) were able to control 97 and 100% aphids at a density below 500 per plant. Spraying of diazinon and malathion (at 0.002% active ingredient) controlled 80 and 87% aphids, respectively. The efficacy of 15 larvae of C. sexmaculata per bean plant was significantly greater than the 2 insecticides in controlling bean aphid and increasing yield.