Evaluation of natural products on some biological and biochemical parameters of pectinophora gossypiella (Lepidoptera : Gelechiidae)‎

الملخص EN

The pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera.: Gelechiidae), is considered a major cotton pest.

Experiments were conducted to study the effect of some natural products namely Thuja orintalis, bug oil, sesame oil and α-pinene on some biological and biochemical aspects of P.

gossypiella under laboratory conditions of 27±1°C and 70±5% RH.

Results revealed that LC50s values were 4.88, 6.29, 3.46 and 1.43 ppm, when newly hatched larvae treated with Thuja orintalis, bug oil, sesame oil and α-pinene, respectively.

Percentages of accumulative larval mortality were estimated by 61, 68, 66 and 58% for previously mentioned compounds, respectively, compared with 5% in the untreated check.

Also, the obtained results showed a prolongation in larval and pupal duration for the tested compounds except bug oil as it recorded 11.8 days for larval duration compared to 14.3 days for the untreated check.

In contrast, all treatments caused considerable reduction in both larval and pupal weight, in comparison to the untreated check.

According to the adult stage, results indicated high reduction in total eggs laid estimated by 140.3, 111, 67.66 and 157 eggs/female for Thuja orintalis, bug oil, sesame oil and α-pinene respectively, compared to 253 for the untreated check.

Percentage of hatchability was reduced to reach 72, 73.6, 62.3 and 81% for the same compounds respectively compared to 96% in untreated check.