Toxicity Test of the Bisamide Insecticide Tetrazolium on the Silkworm,Bombyx mori
Tetrazolamide is a new type of bis-amide insecticide,in order to clarify its toxicity and safety risk to silkworms,the acute toxicity of 200 g/L tetrazolamide suspension to silkworms starting from the age of 3 was determined by the leaf dipping method,and the LC50 was 0.335 5 mg/L,which was of very high toxicity,and posed a very high risk to sericulture production.The residual toxicity of tetrazolium suspension at conventional concentration(200 g/L)sprayed on mulberry leaves was more than 90 d for silkworms at the age of 3.The fumigation toxicity of tetrazolium suspension at 200 g/L to silkworms was not observed,and there was a slight systemic conductivity toxicity after spraying on mulberry leaves or root-irrigation treatment of soil.The symptoms of tetrazolamide poisoning on silkworms were similar to those of chlorothalonil and other bis-amide insecticides,mainly manifested as refusal to feed,sedentary,vomiting,excreting continuous faeces,shortening of the silkworm body and other symptoms.Since tetrazolamide is highly toxic to silkworms and has a super long residual period,it is recommended that tetrazolamide should not be used in sericulture areas to avoid contamination of mulberry leaves by the liquid,which may cause poisoning losses in sericulture.
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