BIOLOGICAL CONTROL OF Pectinophora gossypiella (SAUND.) AND Earias insulana (BOISD.) IN COTTON FIELDS AT DAKAHLIA GOVERNORATE, EGYPT BY AUGMENTATIVE RELEASES OF Trichogramma evanescens WESTWOOD | ||
| Journal of Plant Protection and Pathology | ||
| Article 5, Volume 32, Issue 3, March 2007, Pages 2295-2306 PDF (672.01 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2007.219467 | ||
| Authors | ||
| Alia M. Abd El-Hafez,; K. A. Hassan; Manal A.A. El-Sharkawy; H. A. Zedan | ||
| Plant Protection Res. Inst. 7 Nadi El said St., Dokki, Cairo, 12311, Egypt | ||
| Abstract | ||
| Field studies were conducted atDakahlia Governorate, Egypt in 2004 and 2005 cotton seasons to evaluate the releases of Trichogramma wasps for pink bollworm, Pectinophora gossypiella(Saund.) and spiny bollworms Earias insulana (Boisd.) management in cotton. In the two seasons, six releases of Trichogramma evanescens Westwood10-15 days intervals were made into 999 and 600 feddan, respectively. While, the recommended bollworms insecticide control program was applied at the control units. This recommended program suggested to use insecticide applications (insect growth regulators, organophosphoric and pyrethroid compounds) when infestation met or exceed the economic level (3%). The overall reduction of infestation with the two pests in Trichogramma units averaged 23.73 and 40%, since infestation averaged 1.35 & 1.44.0 in these units and 1.77 & 2.4% in control units at the two seasons, respectively. Meanwhile, T. evanescens succeeded to maintain boll infestation below the economic level in 78 and 84% of the dissected boll samples in the two seasons, respectively. The corresponding figures by insecticides were 67 and 56% in the two seasons, respectively. | ||
| Keywords | ||
| Pectinophora gossypiella; Earias insulana; Trichogramma evanescens; biological control | ||
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