シミュレーションによるチャ寄生クワシロカイガラムシの最適防除時期の推定

概要

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Optimum timing of insecticide application for the white peach scale, Pseudaulacaspis pentagona (Targioni), that had infested tea trees was estimated using a simulation method. Fenpyroximate-buprofezin mixture was used as the test insecticide. Mortalities of the larvae (age, 1 to 8 days) of the scale were investigated, after using the insecticide, in a laboratory. In addition, residual activities of the insecticide that lasted up to 4 days after the spraying on the hatched larvae of the scale were investigated in a field and the laboratory. On the basis of these experimental data, and assuming that hatchability is represented as a sigmoid curve, the effects of the timing of the insecticide application on larval mortality in tea fields were simulated. The simulation results showed that larval mortality was the highest at a hatchability of 73.1% and that the optimum application period of the insecticide was 3 days.
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