几种杀菌剂对南方红豆杉炭疽病的室内毒力测定

Indoor Toxicity Measurement of Several Fungicides on Anthracnose of Southern Chinese Yew

选择7种不同的杀菌剂,用分生孢子萌发法和菌落生长速度法对南方红豆杉炭疽病进行了室内毒力测定。分生孢子萌发法测定结果表明,7种药剂对孢子萌发均有很好的抑制作用,其中,甲基托布津的抑制效果最好,平均抑制率达到96.71%;最差的为代森锌,平均抑制率为59.31%。杀菌剂对菌丝生长的影响试验结果表明,甲基托布津的抑制效果最佳,平均抑制率达到84.60%;最差的是代森锌,为32.15%。根据毒力回归方程和EC50结果得出,7种杀菌剂的毒力大小依次为：甲基托布津〉炭克（多福溴菌）〉多菌灵〉退菌特〉达科宁〉代森锰锌〉代森锌。

The results of the study on the virulence bioassay by restraining conidial germination with toxic medium indicates： 7 kinds of fungicides have very strong inhibitory effect to conidium germination,among which thiram-thiophanate-methyl has the highest inhibitory effect.The restraining rate reaches 96.71%,of which Zineb is the lowest,with the equal restraining rate of 59.31%.The results of the study on the influence of the fungicides to the hypha grows show that the inhibitory effect of thiram-thiophanate-methyl is the highest,with restraining rate reaching equally 84.60%;the inhibitory effect of Zineb is the lowest and the restraining rate is equally 32.15%.Through virulence regression equation and the results of EC50,the virulence strong sequence of the 7 kinds of fungicides for the experiment is as follows： thiram-thiophanate-methyl〉Bromothalonil〉Carbendazim 〉Tuzet〉Doconct〉Mancozeb-sulfur〉Zineb.