Predation Rate and Developmental Biology of Menochilus sexmaculatus (Coleoptera: Coccinellidae) on Myzus persicae

Abstract

Predation rate and developmental biology of Menochilus sexmaculatus (Coleoptera: Coccinellidae) on Myzus persicae were investigated to evaluate its potential as a biological control agent in aphid-infested cropping systems. Laboratory experiments were conducted under controlled environmental conditions using different prey densities of M. persicae, and parameters such as larval development, survival, fecundity, and predation efficiency were recorded across life stages of the predator. Results indicated that M. sexmaculatus exhibited strong predatory activity on all larval instars and adults of M. persicae, with consumption rates increasing with prey density up to a saturation threshold. Developmental duration of the predator varied depending on prey availability, with shorter developmental periods and higher survival observed under higher aphid densities. Fecundity and adult longevity were also positively influenced by increased prey abundance, indicating a strong functional response of the predator to prey density. The predation pattern suggested a Type II functional response, characterized by rapid increase in consumption at low prey density followed by stabilization due to handling time constraints. Developmental parameters further demonstrated the predator’s adaptability and efficiency in exploiting aphid populations. The study highlights the strong biological control potential of M. sexmaculatus against M. persicae in agricultural ecosystems. These findings support its integration into aphid management programs as an effective natural enemy for sustainable pest suppression.