Inundative release of Trichogramma chilonis for the biological control of pink bollworm (Pectinophora gossypiella) in cotton

Nargis Lodhi, Bhai Khan Solangi, Imran Khatri, Raza Muhammad Memon

Abstract


Pink bollworm (Pectinophora gossypiella) is a major pest of cotton worldwide, including in Pakistan, causing substantial quantitative and qualitative yield losses. Therefore, the effectiveness of the egg parasitoid Trichogramma chilonis was evaluated for the management of pink bollworm in cotton. The field experiment was conducted during the cotton growing season at the experimental fields of the Nuclear Institute of Agriculture, Tandojam. Two experimental plots were sown with the cotton variety NIA-Noori. In one plot, T. chilonis was released at a density of two cards per 1/4 acre, while the other plot served as an untreated control without parasitoid release. The results indicated a significant reduction in pink bollworm infestation on cotton flowers and bolls in the T. chilonis-released plot compared to the control. The highest infestation was observed in the control treatment, with 10.67% infestation on flowers and 18.91% on bolls. In contrast, infestation on cotton buds remained nearly the same (1.18%) in both treatments. Based on these findings, it can be concluded that T. chilonis is an effective biological control agent against pink bollworm. Its periodic release is recommended as an eco-friendly and sustainable strategy for managing pink bollworm infestations in cotton.


Keywords


Trichogramma chilonis, Pectinophora gossypiella, Biological control, Cotton pest management, Egg parasitoid

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DOI: https://doi.org/10.33804/pp.009.04.5849

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