Preparation of diflubenzuron effervescent tablet and determining of toxity

A formulation of effervescent pesticidal tablet suitable for dilution with water to spray was reported in this paper.A chitin inhibiting insecticide diflubenzuron was an active ingredient (a.i.) in this formulation.A reverse phase high performance liquid chromatography method of determining the content of diflubenzuron effervescent tablet was established.The newly enclosed 3rd instar larvae of Mythimna separata Walker were fed with the maize foliage of diflubenzuron and administrated in 60h.The EC50 of effervescent tablet and wettable powder were 0.1210,0.1236 μg/mL respectively.