新型水稻浸种剂对恶苗病及干尖线虫病的防治效果

摘要

The inhibitory activity of Tebuconzole , Fluazinam, Fludioxonil, Cartap, and their mixtures to the hyphal growth of Fusarium verticillioides Nirenberg, and their nematicidal activity to Aphelenchoides besseyi were tested in laboratory by using mycelial growth rate method and dipping method , respectively, and the co-toxicity coefficient (CTC) of their mixtures was determined by u-sing Sunyunpei's method.The results showed that the EC50 values of Tebuconzole, Fluazinam, Fludioxonil and Cartap against the hyphal growth of F.verticillioides were 0.3097, 0.3342, 1.0068 and 2077.27 μg/mL respectively, and their LD50 values against A.besseyi were more than 2000, more than 2000, above 2000, and 22.1177μg/mL respectively.Both the mixture of Tebuconzole+Fluazinam +Cartap (1∶2∶2) and the mixture of Tebuconzole +Fludioxonil +Cartap (1∶2∶2) had the best inhibitory effi-ciency on the hyphal growth of F.verticillioides and the best nematicidal efficiency on A.besseyi.In the field test, using the 1000-fold solution of 12.5%Tebuconzole· Fluazinam· Cartap (1∶2∶2) WP or the 1200-fold solution of 12.5%Tebuconzole· Fludi-oxonil· Cartap (1∶2∶2) WP to soak rice seeds for 48 hours had better control efficiency on bakanae disease of rice , and these two kinds of seed-soaking agents were safe to the seed germination and seedling formation of rice .%采用菌丝生长速率法和浸渍法在室内测定了戊唑醇、氟啶胺、咯菌腈和杀螟丹及其混配剂对水稻恶苗病菌菌丝生长的抑制活性和对水稻干尖线虫的杀虫活性，并计算混剂的共毒系数。结果表明：戊唑醇、氟啶胺、咯菌腈和杀螟丹抑制水稻恶苗病菌菌丝生长的EC50值分别为0．3097、0．3342、1．0068和2077．27μg/mL；杀灭线虫的LD50值分别为＞2000、＞2000、＞2000和22．1177μg/mL。戊唑醇∶氟啶胺∶杀螟丹和戊唑醇∶咯菌腈∶杀螟丹按1∶2∶2的比例混配后对恶苗病菌的抑菌活性具增效作用，对干尖线虫的杀虫活性具相加作用。按此配比加工的12．5％戊唑醇·氟啶胺·杀螟丹WP和12．5％戊唑醇·咯菌腈·杀螟丹WP按1∶1000倍或1∶1200倍液浸种48 h对水稻恶苗病的防治效果较好，对水稻种子发芽和成苗安全。