Survey and Seasonal Dynamics of Tetranychus turkestani (Acari: Tetranychidae) on Cotton and Associated Predatory Mites

Abstract

Spider mites are important arthropod pests in cotton ecosystems, with Tetranychus turkestani emerging as a significant species contributing to yield losses under favorable climatic conditions. The present study aimed to conduct a survey and assess the seasonal dynamics of T. turkestani on cotton along with its associated predatory mite complex. Field surveys were carried out across major cotton-growing areas, and mite populations were monitored at regular intervals using standardized leaf sampling techniques. Results revealed the presence of T. turkestani as the dominant tetranychid species, with population peaks occurring during warm and dry periods of the growing season. Initial infestation was observed during early vegetative stages, followed by rapid population buildup during flowering and boll development stages. Predatory mites belonging primarily to the family Phytoseiidae were consistently associated with spider mite populations, indicating a natural regulatory relationship. However, predator abundance lagged behind prey population growth, resulting in periodic outbreaks of T. turkestani. Environmental factors such as high temperature, low relative humidity, and reduced rainfall significantly influenced mite population dynamics. Correlation analysis indicated a positive relationship between pest abundance and temperature, while predatory mite activity was influenced by prey availability and microclimatic conditions. The study highlights the importance of understanding seasonal fluctuations for effective management of spider mites in cotton ecosystems. Overall, T. turkestani exhibits strong seasonal adaptability and rapid population growth potential, necessitating timely intervention strategies. Conservation of natural enemies and integration of biological and chemical control measures are recommended for sustainable management of spider mite infestations in cotton agroecosystems.