Laboratory tests conducted to evaluate the ability of three formamidines (chlordimeform, amitraz, and N'-(2,4-dimethylphenyl)- N-methylformamidine SN-49844, a metabolite of amitraz) to synergize permethrin in tobacco budworm (TBW) showed no synergism in susceptible larvae, but did show synergism in resistant larvae. Chlordimeform (CDF) and N'-(2,4-dimethylphenyl)-N-methylformamidine SN-49844 showed higher degrees of synergism than amitraz. Selection of cross-bred larvae of tobacco budworm using permethrin ± formamidine mixtures at LD 80 for four generations produced strong tolerance to all agents used in the selection. A test for cross-resistance to cypermethrin and to methyl parathion in a permethrin-selected strain of tobacco budworm showed resistance levels of 58-fold, and 48-fold, respectively, compared with susceptible TBW.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/278560 |
| Date | January 1990 |
| Creators | Mosupi, Pharoah Opelo Pedro, 1961- |
| Publisher | The University of Arizona. |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Thesis-Reproduction (electronic) |
| Rights | Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. |
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