Predation Rate and Prey Preference of Chrysoperla pallida (Neuroptera: Chrysopidae) on Different Aphid Species at Varying Temperatures

Abstract

Chrysoperla pallida (Neuroptera: Chrysopidae) is an important predatory insect widely recognized for its potential in the biological control of soft-bodied agricultural pests, particularly aphids. Understanding the predation efficiency and prey preference of this predator under different environmental conditions is essential for optimizing its application in integrated pest management programs. The present study investigated the predation rate and prey preference of Chrysoperla pallida on different aphid species under varying temperature regimes. Laboratory experiments were conducted under controlled environmental conditions using multiple aphid species commonly associated with agricultural crops. Larvae of C. pallida were exposed to different prey densities at several temperature levels, and data on prey consumption, feeding behavior, developmental performance, and prey preference were recorded and analyzed. The results demonstrated that temperature significantly influenced the predatory efficiency of C. pallida. Higher predation rates were generally observed at moderate temperature conditions, whereas extremely low or high temperatures reduced feeding activity and predator performance. The predator exhibited clear prey preferences among the tested aphid species, with certain aphids being consumed more frequently due to differences in body size, mobility, and host suitability. Increased prey availability also enhanced predation rates, indicating a strong functional response of the predator to aphid density. The findings suggest that both temperature and prey type play critical roles in determining the biological control potential of C. pallida. The study highlights the adaptability and effectiveness of this predator as a natural enemy of aphid pests in diverse agroecosystems. These results provide valuable information for improving biological control strategies and support the incorporation of C. pallida into integrated pest management programs aimed at reducing reliance on synthetic insecticides and promoting sustainable crop protection practices.