噻霉酮和苯醚甲环唑混配对4种不同病原菌的增效作用

Synergistic activity of benziothiazolinone/difenoconazole complex against four different fungi

采用室内生长速率法,以黄瓜菌核病菌、棉花立枯病菌、番茄早疫病菌和辣椒炭疽病菌为作用目标,研究了噻霉酮和苯醚甲环唑混配对病菌的增效作用。苯醚甲环唑对4种病菌的EC50为0.650 9～1.211 2mg/L,噻霉酮对4种病菌的EC50为20.887 0～43.514 6mg/L。当苯醚甲环唑和噻霉酮的混配比例为1∶10时,对黄瓜菌核病菌的共毒系数为519.11;混配比例为1∶2时,对辣椒炭疽病菌的共毒系数为230.66;混配比例为1∶5时,对棉花立枯病菌和番茄早疫病菌的共毒系数分别为219.42和190.71。噻霉酮和苯醚甲环唑按适当比例混配对4种不同病原菌具有明显的增效作用。

The inhibition activities of benziothiazolinone, difenoconazole and their mixture against Sclerotinia sclerotiorum , Rhizoctonia solani , Alternaria solani and Colletotrichum capsici were studied. The synergistic activ- ity of benziothiazolinone/difenoconazole complex against four different fungi was studied based on the mycelial growth method in the laboratory. Bioassay results showed that the EC50 values of benziothiazolinone （A） against 4 fungi were ranged from 0. 650 9 mg/L to 1. 211 2mg/L, and the ECs0 values of difenoconazole （B） against 4 fungi were ranged from 20. 887 0 mg/L to 43. 514 6 mg/L. When the ratio of the mixture of benziothiazolinone （A） and difenoconazole （B） was 1：10, the co-toxicity coefficient （CTC） against mycelial growth of S. sclerotiorum was 519.11; when the ratio of the mixture was 1：2, the CTC against mycelial growth of C. capsici was 230.66; when the ratio of the mixture was 1：5, the CTC against mycelial growth of R. solani and A. solani were 219.42 and 190.71, respectively. The results suggested that benziothiazolinone and difenoconazole had significant synergistic activity against 4 different fungi when combined by appropriate ratio.