Boll Weevil: Chemosterilization by Fumigation and Dipping13
| Autor: | Paul H. Terry, Charles W. Woods, Alexej B. Bořkovec |
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| Rok vydání: | 1978 |
| Předmět: | |
| Zdroj: | Journal of Economic Entomology. 71:862-866 |
| ISSN: | 1938-291X 0022-0493 |
| Popis: | A procedure suitable for sterilizing both sexes of Anthonomus grandis grandis Boheman on a large scale was developed. First, the weevils were fumigated with bisazir ( P,P -bis(1-aziridinyl)- N -methylphosphinothioic amide, AI3-61585) at atmospheric pressure for 90 min, and 30 min later, they were dipped for 5 sec into a 1.35% solution of penfluron (2,6-difluoro- N -[[[4-(trifluoromethyl) phenyl]amino]carbonyl]benzamide, AI3-63223) in acetone. In either sex, the sterility exceeded 99%, and 59.3% of the treated males survived 10 days posttreatment. A new laboratory-size fumigation chamber with a rotating bisazir-treated paddle was designed and scaled up to a field-size chamber suitable for treating up to 200,000 weevils at a time. Monitoring of the sterilizing treatment consisted of measuring the concentration of bisazir vapors during the fumigation and analyzing the treated weevils for residues of bisazir and penfluron. One day posttreatment, no residues of bisazir or of its aziridinyl metabolite could be detected in the treated weevils, but penfluron residues decreased only slowly from 39 to 8.8 μg/weevil within 7 days. Oviposition of untreated females mated to treated males was decreased; also, treated males were less effective than untreated ones in transferring sperm. On the other hand, when various ratios of treated and untreated males were combined with untreated females, the treated males appeared more competitive because they suppressed reproduction more effectively than their proportional number would warrant. The development of the new sterilizing procedure now makes it possible to test the performance of chemosterilized weevils in large field tests. |
| Databáze: | OpenAIRE |
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