Economic Damage Threshold of the Pink Bollworm, Pectinophora gossypiella (Saund.) and the Spiny Bollworm, Earias insulana (Boisd.) In Egyptian Cotton Fields

Document Type : Original Article

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Plant Protection Research Institute, ARC, Dokki Giza, Egypt

Abstract

The economic damage threshold, which is the point at which a significant drop in cotton production occurs at different levels of infestation by the cotton bollworms Pectinophora gossypiella (Saund.) and Earias insulana (Boisd.) was quantitatively determined. The experiment did not include any control measures against cotton bollworms. Therefore, after planting cotton seeds for 150–170 days, mature cotton bolls were collected and investigated. Three levels of infestation were noted [infested of all shutters per boll (opened boll completely infested), infested of one-third and two-thirds of shutters per boll (opening of two-thirds and one-third per boll), and total infested bolls on cotton plant]. Based on the results, the economic damage thresholds for the three infestation levels were roughly 14.26 to 14.60, 13.90 to 15.91, and 24.05 to 25.30 percentage of infested bolls/ mature cotton bolls/plant throughout the first and second years of investigation (2021 and 2022), respectively. Effective pest control strategies require a thorough understanding of the extent to which various bollworm species reduce cotton yield. To guarantee cotton farming's long-term viability, more study in this field is required.

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