Effect of a Rice Blast Controlling Agent, Isoprothiolane, on Nilaparvata Lugens Stal with Different Levels of Susceptibility to Diazinon
Isoprothiolane (Fuji-one®, diisopropyl 1,3-dithiolan-2-ylidene-malonate, Figure 1) has been developed as a fungicide showing eradi-cant as well as protectant activities against the most important fungal disease of rice plant caused by Pyvioutavia oryzae Cav. (Taninaka et al., 1976). It acts on the fungus at the penetration and growth stages of the infecting hyphae rather than at those of conidial germination and appressorium formation (Araki and Miyagi, 1977). Besides being applied as a foliar spray, a submerging technique has been developed in which isoprothiolane is applied to the irrigation water as granules containing 12% active ingredient.
KeywordsRice Plant Paddy Field Conidial Germination Appressorium Formation Brown Planthopper
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