ミカンハムグリガ防除のための農薬散布とミカンハダニの個体数変動(予報)

抄録

Present work was carried out to clarify the effect of insecticides for citrus leaf miner control on the numerical population of the citrus red mite, preparing 30 young citrus trees planted in one orchard. Of 30 citrus trees, 10 were sprayed with nicotine sulfate (×600), 10 were sprayed with the mixture of nicotine sulfate (×800) and endrin (×1, 000), and 10 were set for the check, respectively. Insecticides were sprayed from spring to autumn once a week. And the number of the citrus red mite of these three sets of citrus trees were examined about 15 days interval from the autumn in 1963 to the summer in 1964.
In the case of the set sprayed with nicotine sulfate, the population level of the red mite did not so increase throughout the experiment. In the case of check, the red mite increased in August and September and then decreased. However, the population of mite in the set sprayed with mixture of nicotine sulfate and endrin increased remarkably even in the winter season from November to January in next year.