The toxicity of diflubenzuron to Oxya japonica (Willemse) and its effect on moulting

A laboratory evaluation of the acute toxicity of diflubenzuron against the final stage of Oxya japonica nymphs showed that it was more effective in preventing the development of the nymphs into the adults when applied topically, than when injected. Histological studies revealed that treated nymphs that subsequently died, before or during ecdysis, suffered from severe endocuticular lesions. Comparable abnormalities and disruption of endocuticular deposition and growth were also seen in nymphs that were treated topically with diflubenzuron at 50 or 200 μg a.i. per insect, although these nymphs appeared normal externally.

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