Safety evaluation of cyetpyrafen,cyflumetofen and cyenopyrafen to Bombyx mor
In order to identify the safety of cyetpyrafen,cyflumetofen and cyenopyrafen to Bombyx mor.The acute toxicities to the 3rd instar silkworm larvae,and the effects of sublethal dose to cocooning performance of silkworm were determined by leaf feeding method.The results indicated that the values of LC50 to silkworm larvae were more than 2 000 mg/L.The three acaricides had no significant effects on the mounting rate and cocooning rate.The mortalities after mounting and mortalities in cocooning frame of cyenopyrafen were higher than blank control.The cocoon weight,cocoon shell weight of cyetpyrafen treatments were lower than blank control treatment,but there were no significant differences in pupa weight and cocoon layer rate between cyetpyrafen and the blank control.The cocoon weight,cocoon shell weight and pupa weight of the treatments of cyenopyrafen 500 and 250 mg/L,were significantly lower than those of the control treatment.The cocoon shell weight and pupa weight of cyenopyrafen 125 mg/L were significantly higher than those of the blank control.The cocoon weight,cocoon shell weight,pupa weight and cocoon shell rate of cyflumetofen were significantly higher than blank control treatment.Therefore,cyetpyrafen,cyflumetofen and cyenopyrafen had low toxic to silkworm and had little effects on the cocooning performance of silkworm at the recommended dose.Cyetpyrafen,cyflumetofen and cyenopyrafen could be used to control mulberry red spider.
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