El-Shennawy, R., Kandel, M. (2024). Effects of certain pesticides on the embryonic development of Pink Bollworm eggs and subsequent stages. Egyptian Journal of Agricultural Research, 102(1), 115-126. doi: 10.21608/ejar.2024.244278.1455
Rania M. El-Shennawy; Mervat A. Kandel. "Effects of certain pesticides on the embryonic development of Pink Bollworm eggs and subsequent stages". Egyptian Journal of Agricultural Research, 102, 1, 2024, 115-126. doi: 10.21608/ejar.2024.244278.1455
El-Shennawy, R., Kandel, M. (2024). 'Effects of certain pesticides on the embryonic development of Pink Bollworm eggs and subsequent stages', Egyptian Journal of Agricultural Research, 102(1), pp. 115-126. doi: 10.21608/ejar.2024.244278.1455
El-Shennawy, R., Kandel, M. Effects of certain pesticides on the embryonic development of Pink Bollworm eggs and subsequent stages. Egyptian Journal of Agricultural Research, 2024; 102(1): 115-126. doi: 10.21608/ejar.2024.244278.1455
Effects of certain pesticides on the embryonic development of Pink Bollworm eggs and subsequent stages
Bollworm Research Department, Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt.
Abstract
The pink bollworm, Pectinophora gossypiella (Saund.) is an important pest that causes severe economic loss for cotton crop. The potent bioactive properties of three tested compounds; the two IGRs compounds; Dimilin (Diflubenzuron) and Nomolt (Teflubenzuron), and the bio-pesticide compound Emacte (Emamectin benzoate); were tested against two different ages of P. gossypiella eggs under laboratory conditions of 26±1°C and 70±5% RH. Results revealed that older eggs of P. gossypiella are more susceptible to pesticides than the younger ones where LC50 values were 155.4, 185.85, and 1.95 ppm. for 0–1-day-old eggs, while decreased to 81.42, 103.42, and 1.30 ppm, for 2-3 days-old eggs in Dimilin, Nomolt, and Emacte treatments, respectively. The incubation periods for eggs were prolonged as a result of the treatments, in comparison to the untreated check. In addition, the estimated developmental periods for the immature stages increased to 19.6, 17.9 and15.85 days for larva and 12.5, 11.8, and 9.76 days for pupa, in treatment of 0-1 day old eggs and to 20.2, 18.8, and 16.9 days for larva and 13.6, 11.98 and 10.36 days for pupa in treatment of 2-3 days old eggs in Dimilin, Nomolt and Emacte treatments respectively, compared to 14.55 days for larval stage and 8.03 days for pupal stage in the untreated. The present study noted also, light changes in the levels of the total protein, carbohydrate and chitin composition during embryogenesis for P. gossypiella eggs as a result of treatments in comparison to the untreated.
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