稻瘟灵与三乙膦酸铝混剂对稻瘟病的防治效果

Controlling effect of the tank mixture of fosethyl-alnminum and isoprothiolane on rice blast disease

分别采用孢子萌发法和菌丝生长法测定了三乙膦酸铝与稻瘟灵5种不同质量配比混剂对稻瘟病菌的毒力。结果表明,不同质量配比的三乙膦酸铝与稻瘟灵混剂都有不同程度的增效作用,其中以三乙膦酸铝与稻瘟灵质量比为1∶1混剂的增效作用最为显著,其抑制孢子萌发和菌丝生长的共毒系数分别为203.92和190.24。田间试验结果表明,以40%三乙膦酸铝WP与40%稻瘟灵WP质量比为1∶1的混剂(1 g.L-1)对稻瘟病的防治效果最佳,达87.20%,分别比40%三乙膦酸铝WP(2.86 g.L-1)和40%稻瘟灵WP(1.25 g.L-1)单用的防治效果提高14.40%和12.28%。

The toxicities of various mixtures of fosethyl-alnminum and isoprothiolane were determined by the method of mycelium growth and spores germination of Pyricularla grisea. The results showed that the mixture of fosethyl-alnminum and isoprothiolane （ mass ratio = 1 ： 1 ） had the most significant inhibiting effect on myeelium growth with the co-toxicity cofficient of 203.92, and had the most significant inhibiting effect on spores germination with the co-toxicity cofficient of 190.24. The controlling effects of the 1 g·L^-1 tank mixture （ the mass ratio of 40% fosethyl-alnminum WP to 40% isoprothiolane WP was 1 ： 1 ） on rice blast disease increased by 14.40% and 12.28%, respectively, compared with that of 40% fosethyl-alnminum WP （2.86g·L^-1） and that of 40% isoprothiolane WP （1.25g·L^-1）.