水稻恶苗病化学防治药剂的筛选

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0.147 3、1.464 5和9.244 5 μg/m l.抑制孢子萌发的EC50分别为0.984 2、3.757 4和0.804 1 μg/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0.047 8和0.036 3 μg/ml,共毒系数分别为615和7 893, 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0.059 7和0.089 4 μg/ml,共毒系数分别为3 253和1 482.

Screen of Chemical Fungicides Against Rice Bakanae Disease

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.