水稻恶苗病化学防治药剂的筛选

Screen of Chemical Fungicides Against Rice Bakanae Disease

用不同药剂 (单剂和混剂 )对水稻恶苗病菌菌丝生长和孢子萌发进行了毒力测定试验 ,结果表明 :单剂中 ,施宝克、使百克和浸种灵的抑制作用明显 ,抑制菌丝生长的EC50 分别为 0 .14 73、1.464 5和 9.2 44 5 μg/ml。抑制孢子萌发的EC50 分别为0 .9842、3 .75 74和 0 .80 41μg/ml。混剂中 ,施宝克 +百菌清和使百克 +多菌灵的抑制作用明显 ,抑制菌丝生长的EC50 分别为0 .0 478和 0 .0 3 63 μg/ml,共毒系数分别为 615和 7893 ,抑制孢子萌发最好的为施宝克 +百菌清和使百克 +浸种灵 ,EC50 分别为0 .0 5 97和 0 .0 894μg/ml,共毒系数分别为 3 2 5 3和 14 82。

To test inhibition effects of different fungicides against Fusarium moniliforme hyphal growth and conidiospore germination,toxicity determinations of single and mixed fungicides against rice bakanae disease had been done.The results showed:in single fungicide,the inhibitions of Sportak,Prochloraz and Scelartial were more significant than the rest. EC 50 inhibiting hyphal growth was 0.147 3 μg/ml,1.464 5 μg/ml and 9.244 5 μg/ml respectively.And in inhibition of conidiospore germination EC 50 was 0.984 2 μg/ml,3.757 4 μg/ml and 0.804 1 μg/ml respectively.With regard to mixed fungicides the effects of Sportak + Chlorothalonil and Prochloraz + Carbendazim were the best.EC 50 and CTC of inhibiting hyphal growth were 0.047 8,0.036 3 μg/ml and 615,7 893 respectively.For inhibiting conidiospore germination Sportak + chlorothalnil and Prochloraz + Seelartial were better,their EC 50 and CTC were 0.059 7,0.089 4 μg/ml and 3 253,1 482 respectively.