Synergistic Effect Between Vapors of C-8514/Schering 36268 and Dichlorvos Against the Carmine Spider Mite

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Abstract
Adult females of Tetranychus telarius (L.), the carmine spider mite, were exposed to sturated atmospheres of C-8514/Schering 36268 (N-(2-methy-4-chlorophenyl)-N', N' dimethyformamidine), and dichlorvos for certain time increments. A dosage-mortality relationship between percentages kill and exposure time was established. The LT50 for adults was 28 seconds for dichlorvos, and 4 hours 8 minutes for C-8514. Taking into account the saturation concentrations (dichlorvos 145 mg per m3; C-8514 4 mg per m3) the LT50 showed a ratio of 1:15 (adults) in favor of dichlorvos. With mite eggs the situation was reversed: C-8514 has a higher killing potential than dichlorvos. When adult females were exposed successively to the 2 toxicants in the vapor phase, the mortality was more than twice as high as could be expected from addition of mortality values after corresponding time exposures in each of the 2 vapor phases. This synergistic relationship was observed whether samples were first exposed to dichlorvos and then to C-8514, or vice versa. C-8514 is very well qualified for greenhouse applications against spider mites. Together with dichlorvos it can be successfully applied in vaporized form against most arthropod pests in cultures under glass.

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