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ABO-SHOLO, M., NASSEF, M., WATSON, W. (2000). CHANGES IN SUSCEPTIBILITY OF THE LARVAE OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA (S AU N D.) TO SYNTHETIC PYRETHROIDS. Egyptian Journal of Agricultural Research, 78(2), 665-673. doi: 10.21608/ejar.2000.321997
MOHAMED K. A. ABO-SHOLO; MOHAMED A. NASSEF; WATSON M. WATSON. "CHANGES IN SUSCEPTIBILITY OF THE LARVAE OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA (S AU N D.) TO SYNTHETIC PYRETHROIDS". Egyptian Journal of Agricultural Research, 78, 2, 2000, 665-673. doi: 10.21608/ejar.2000.321997
ABO-SHOLO, M., NASSEF, M., WATSON, W. (2000). 'CHANGES IN SUSCEPTIBILITY OF THE LARVAE OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA (S AU N D.) TO SYNTHETIC PYRETHROIDS', Egyptian Journal of Agricultural Research, 78(2), pp. 665-673. doi: 10.21608/ejar.2000.321997
ABO-SHOLO, M., NASSEF, M., WATSON, W. CHANGES IN SUSCEPTIBILITY OF THE LARVAE OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA (S AU N D.) TO SYNTHETIC PYRETHROIDS. Egyptian Journal of Agricultural Research, 2000; 78(2): 665-673. doi: 10.21608/ejar.2000.321997

CHANGES IN SUSCEPTIBILITY OF THE LARVAE OF PINK BOLLWORM, PECTINOPHORA GOSSYPIELLA (S AU N D.) TO SYNTHETIC PYRETHROIDS

Article 14, Volume 78, Issue 2, July 2000, Page 665-673  XML PDF (2.41 MB)
Document Type: Original Article
DOI: 10.21608/ejar.2000.321997
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Authors
MOHAMED K. A. ABO-SHOLO; MOHAMED A. NASSEF; WATSON M. WATSON
Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt
Abstract
Field experiments were conducted during 1997 and 1998 cotton seasons to study the effect of individual synthetic pyrethroids sprayed three times at 15 days interval on the population density of the pink bollworm larvae infesting cotton bolls. Data shown that ?.-cyhalothrin and cyhalothrin proved to be the most effective in reducing pink boll­worm incidence on cotton among the tested compounds. They caused 79.29 and 77.45% reduction of pink bollworm larval population in 1997 and 74_97% and 71.97% in 1998, respectively. On the other hand, del­tamelhrin ad cyfluthrin were the least effective insecticides, giving 59.44 and 54.95% in 1997 and 50.00 and 46.94% reduction in 1998, respectively. Also, the response of the field strain larvae to the same insecti­cides at the end of the rotational chemical control programme was eval­uated in laboratory. Data indicate that the larvae of 1998 showed more tolerance compared to that of 1997 season. The tolerance ratio ranged between 1.01 and 1.32 at LC50 level, where it ranged between 1.08 and 1.69 at LC50.
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