Toxicity of Pyrethroid Insecticides to Carrot Weevils: Enhancement by Synergists and Oils
| Autor: | A. B. Stevenson, E. S. Barszcz, D. J. Pree |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Journal of Economic Entomology. 89:1254-1261 |
| ISSN: | 1938-291X 0022-0493 |
| DOI: | 10.1093/jee/89.5.1254 |
| Popis: | In laboratory bios says over 24 h, pyre throed insecticides, with the exception of tefluthrin, were more toxic than azinphosmethyl or foamer to the carrot weevil, Listronotus oregonensis (Leconte). The toxicity of permethrin decreased as post treatment holding temperatures were increased. LC50 values for pyre thyroids increased by ≈2- to 3-fold between 24 and 48 h as weevils recovered from treatment. The synergisms piper only but oxide and DEF enhanced the toxicity of permethrin by 3- to 5-fold in both 24- and 48-h post treatment observations, but recovery rates were similar to those for permethrin alone. Addition of herbicidal (mineral) oil increased the toxicity of permethrin and deltamethrin, whereas the addition of olive oil was either antagonistic or ineffective. The increased toxicity of the herbicidal oilpyrethroid mixture appeared associated with more rapid penetration of insecticide. In field trials, cypermethrin was as effective for control of the carrot weevil as the currently recommended insecticide foamer and is, therefore, a suitable alternative where control of both carrot mst fly, Pails rosae (F.), and carrot weevil is necessary. Application of cypermethrin in herbicidal oil was not more effective than cypermethrin alone against the carrot weevil at the concentrations tested. |
| Databáze: | OpenAIRE |
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