パラチオン乳剤の物理性および散布方法とニカメイチュウ防除効果との関係について

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Though parathion has become widely used in controlling rice stem borer, Chilo suppressalis WALKER, which is one of the most important pests of rice plant, the improvements or theapplicator and the method of application still remain to be studied. UEJIMA et al (1954), YAMASHINA (1954) and FUKUDA (1955) have studied on the adhesion, systemic action and residuality of parathion on rice plant and proposed the necessity of the improvement of the applicator and the method of application. The authors have studied the effects of the physical properties and the method of application of parathion to control the rice stem borer. The results are summarized as follows : 1. Insecticides used : a. Parathion 47 percent emulsifiable concentrate diluted to 0.002-0.06 percent. b. Triton X-100 added to above as a wetting agent. c. Diazinon 60 and 20 percent emulsifiable concentrates diluted to the same concentrations as parathion. 2. Quantity of spray liquid applied : 5cc, 10cc, 20cc and 40cc. 3. Methods of aplication. a. Sprayed only on the leaf surfaces of rice plant. b. Sprayed only on the leaf sheaths of the rice plant where larvae are bored in. 4. Results : The effect of controlling the first brood rice stem borer was small in case of spraying a large amount of liquid on the leaf sheaths of the plant when the wetting power of the spray liquid is strengthened because a large part of the spray liquid runs off the plant. The effect of controlling the second brood rice stem borer, however, was greater in case of spraying on leaf surfaces because the spray liquid runs down into the leaf sheaths where larvae are bored in. But the effect of changing the physical properties of the spray liquid was not definite when a small amount of liquid was applied and this means that there was no definite difference of the killing effect observed between parathion and diazinon. In consequence, the effect of controlling rice stem borer differed greatly when the wetting power of the spray liquid of parathion to the rice plant is strengthened by changing its physical properties owing to the changes of adhesion and the running off of the spray liquid. The effect of the control also seems to be affected by the method of application and the growth of the rice plant. Therefore, not only the systemic action of parathion but also its running into the leaf sheaths seems to play an important role in the control of the rice stem borer.
日本応用動物昆虫学会の論文
1957-03-30

パラチオン乳剤の物理性および散布方法とニカメイチュウ防除効果との関係について

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