oa Journal of the Entomological Society of Southern Africa - Systemic behaviour and toxicity to wheat aphids of methyl-s-demeton after uptake by wheat plants
Laboratory-grown wheat plants, infested with wheat aphids, Schizaphis graminum (Rond.), were treated with various concentrations of the systemic insecticide methyl-s-demeton. After exposure to the insecticide, the surviving aphids were counted and a small sample of leaf, taken from the area where aphids had fed, was incubated with a standard fly-head esterase preparation. The data obtained were used to calculate the LI 50 (that percentage inhibition of the standard esterase preparation which corresponded to a 50 percent mortality of the aphids). Translocation and retention time of the insecticide was also investigated.
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