氟吡菌酰胺与啶菌噁唑混配对灰葡萄孢的联合毒力

Joint Toxicity of Mixing Fluopyram with Pyrisoxazole Against Botrytis cinerea

采用菌丝生长速率法测定了氟吡菌酰胺与啶菌噁唑不同配比(质量比2∶1、1∶1、1∶2、1∶3、1∶4)混配对灰葡萄孢XSZH1的联合毒力,以及最佳增效配比对XSHF6、XSHF2、17RC12和XSHF7等4株灰葡萄孢的联合毒力,并在田间验证了最佳组合对番茄灰霉病的防治效果。结果显示,氟吡菌酰胺与啶菌噁唑以质量比2∶1和1∶4混配时,对灰葡萄孢XSZH1具有毒力增效作用,前者的增效作用最明显,增效系数为1.69。氟吡菌酰胺与啶菌噁唑以质量比2∶1混配时对其他4株灰葡萄孢菌株也显示出毒力增效作用,且在田间有效剂量为150～250g·hm-2时,对番茄灰霉病的防治效果为80.50%～90.13%。可见氟吡菌酰胺与啶菌噁唑以质量比2∶1混配可以有效地控制番茄灰霉病,适合在田间应用推广。

The joint toxicity of mixing fluopyram with pyrisoxazole at different matching ratios against B. cinerea XSZH1 was determined by measuring mycelial growth rate test.The inhibitory activity of the mixture with the other 4 isolates of B. cinerea was also determined by the same method.The efficacy in controlling tomato gray mould was tested through field trials.The results showed that synergia effect against B. cinerea of mixing fluopyram with pyrisoxazolewere found at the ratios of 2∶1 and 1∶4,while the ratio of 2∶1 exhibited the most obvious synergia effects,the synergistic coefficient was 1.69.The mixture of fluopyram with pyrisoxazole,at the ratio of 2∶1,also showed synergistic inhibition to the other 4 isolates.The control effect of this mixture(2∶1) against tomato gray mould was 80.50%-90.13%,under the dose of 150-250 g·hm^-2.The mixture of fluopyram and pyrisoxazole(2∶1)could effectively control tomato gray mould.It is suitable to use this mixture in field application and extension.