Gigaspora margaritaの胞子発芽におよぼす殺虫剤の影響

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Effects of organic phosphorus pesticides were investigated on the spore germination of Gigaspora margarita and the infection of kidney beans. Five kinds of pesticides, DDVP, isoxathion, MEP, EPN, and malathion, were tested in this study. To estimate the effects on spore germination, the germination rate and the amount of mycelial growth were determined by immersing the spores in the solutions of those pesticides. Their effects on the spore germination in soil and the infection of kidney beans were examined by dropping the pesticide solution on the surface of soil packed in a pot. All the pesticide solutions inhibited the germination of Gigaspora margarita and its mycelial elongation. The repressive effects were strong for DDVP and isoxathion and weak for EPN and malathion. When dropped on the soil, 10^2-fold diluted solutions of DDVP, isoxathion, MEP and malathion, and 10-fold diluted solution of EPN showed the repression of germination in soil ; however, none of their 10^3-fold diluted solutions, which contain the respective pesticides at a concentration in ordinary use, repressed the germination. In addition, the infection of kidney beans was not affected even by the dropping of the 10^2-fold diluted solutions. These results indicate that organic phosphorus pesticides have inhibitory effects on the spore germination and the mycelial growth in Gigaspora margarita. However, when dropped on soil at a concentration in ordinary use, organic phosphorus pesticides were found to have no effects on the spore germination and the infection of kidney beans.
社団法人日本土壌肥料学会の論文
1996-08-05

Gigaspora margaritaの胞子発芽におよぼす殺虫剤の影響

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