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Browsing by Subject Earias insulana

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  • Impact of conventional insecticides on two bollworms and their indirect effects on the ectoparasitoid, Bracon brevicornis (Wesmael) (Hymenoptera: Braconidae)

    • Authors: Kandi, Mervat A.;  Advisor: -;  Participants: Moustafa, Hemat Z. (2019)

  • In this study, experiments were performed to investigate and evaluate the toxicity of etofenprox and chlorpyrifos insecticides against newly hatched larvae of Pectinophora gossypiella and Earias insulana. Some biological aspects of compound effects on larval and pupal duration, percentage of mortality, and percentage of adult emergence which resulted from treated newly hatched larvae were studied. The results revealed that LC50 was 0.7 and 0.87 ppm when P. gossypiella was treated with etofenprox and chlorpyrifos, respectively, while LC50 was 0.09 and 0.73 ppm when E. insulana was treated with etofenprox and chlorpyrifos, respectively. The obtained results showed that the percentage of...
  • BB

  • Influence of some insecticide sequences on the injurious insect- pests of cotton plants

    • Authors: Ismail, Seham M.;  Advisor: -;  Participants: - (2019)

  • The highest reduction percentages are effective sequences 7 and 5 (gave about 90% infestation reduction) were started and mediated with new insecticides, and when started and mediated with spinosad, or with cypermethrin, sequences 2 and 3 (gave about 86%) respectively, also, the repetition of the same insecticide twice in a regimen might increase, might decrease, or has no effect on the insecticide efficiency against cotton bollworms. The tested sequence programs showed high protection for green bolls with protection percentages ranged from 66.1 and 67.2% (sequence 1) to 92.6 and 94.1% (sequence 7) during two seasons respectively. On the other hand, the superiority in yield loss reduc...
  • BB

  • Relationship between cotton planting date and two bollworms associated with their natural enemies

    • Authors: Attia, Zakaria Abdelhalim;  Advisor: -;  Participants: Ebada, Laila; Abdelmaksoud, Nasr Mohamed (2021)

  • The insect infestation increased significantly by delaying planting date. The fewest numbers of pests attacked cotton recorded in the earliest planting date (March 23rd) with highest weight of cotton yield. The results showed that the mean rates of infestation with pink bollworm were (2.11, 3.5, 2.33 individuals/boll) for March 23rd, April 17th and May 6th, respectively, while the mean rates of infestation with bollworm were (1.60, 2.79, 1.67 individuals/boll) for March 23rd, April 17th and May 6th, respectively.