恶霉灵与溴菌腈混配对香蕉枯萎病菌的抑制效果

分别以孢子萌发法与菌丝生长法测定了噁霉灵与溴菌腈5种不同配比混配制剂对香蕉枯萎病菌的毒力.结果表明,不同配比的噁霉灵与溴菌腈的混配制剂都有不同程度的增效作用,其中以噁霉灵∶溴菌腈=2∶1的混配制剂增效作用最为显著,孢子萌发法和菌丝生长法的共毒系数分别为220和262.按噁霉灵∶溴菌腈=2∶1制成的45%噁霉灵*溴菌腈WP处理蕉园土中的孢子和菌丝,300～225 mg/L药液对孢子和菌丝的抑制率均达95%以上;处理香蕉枯萎病菌接种过10天的盆栽香蕉组培苗,20天后的防效达80%,比25%溴菌腈WP 625 mg/L和90%噁霉灵SP 300 mg/L的防治效果分别提高53%和14%.

The inhibition effect of the mixture of hymexazol and bromothalonil on Fusarium oxysporum f.sp.cubense

The toxicity of various hymexazol and bromothalonil mixtures were determined by mycelium growth and spores germination of Fusarium oxysporum f.sp.cubense(Smith) Snyder et Hansen.The results showed that 5 kinds of mixtures had different synergisms,of which the mixture of hymexazol : bromothalonil=2:1 was the most significant with the co-toxicity coefficient of 262 on mycelium growth and 220 on the spores germination respectively.The mixture of hymexazol : bromothalonil=2:1 was made into 45% hymexazol bromothalonil WP.It had over 95 % inhibition effect to both mycelium growth and spores germination of the fungi in the soil.The control effects of the mixture increased by 53% and 14% respectively,compared with that of 90% hymexazol SP and 25% bromothalonil WP after being applied to banana plant infected by banana vascular wilt fungi for 20d.