Seasonal Incidence and Spatial Distribution of Myzus persicae (Hemiptera: Aphididae) on Pepper in Protected Cultivation

Abstract

Myzus persicae (Hemiptera: Aphididae), commonly known as the green peach aphid, is a major insect pest of pepper crops cultivated under protected environments. The pest causes significant economic damage through direct feeding, honeydew secretion, and transmission of plant viruses, leading to reduced crop growth and fruit quality. Understanding the seasonal incidence and spatial distribution of M. persicae is essential for developing effective pest monitoring and management strategies in protected cultivation systems. The present study was conducted to investigate the population dynamics and spatial distribution patterns of M. persicae on pepper crops grown under greenhouse conditions. Regular field observations were carried out throughout the cropping season, and aphid populations were monitored at different growth stages of the crop. Data on aphid density, infestation intensity, and environmental parameters such as temperature and relative humidity were recorded and analyzed to determine their influence on pest occurrence. Spatial distribution patterns were assessed using dispersion indices and aggregation models to identify the distribution behavior of aphid populations within the cultivation area. The results revealed that aphid incidence varied significantly across different stages of crop growth and environmental conditions. Peak population density was observed during periods characterized by moderate temperature and relatively high humidity, which favored rapid multiplication of the pest. Spatial analysis indicated that M. persicae populations exhibited an aggregated distribution pattern within the greenhouse environment, with infestation concentrated in localized areas of the crop canopy. The findings highlight the influence of environmental factors on aphid population dynamics and demonstrate the importance of spatial monitoring for early pest detection. This study provides valuable information for the implementation of integrated pest management strategies, including targeted monitoring and localized control measures, to minimize aphid infestation and improve pepper production under protected cultivation systems.