5种药剂对桑尼短体线虫的毒力测定和室内防效

Determination of laboratory toxicity and control effect of five insecticides against Pratylenchus thornei

【目的】筛选有效防治桑尼短体线虫(Pratylenchus thornei)的药剂,为燕麦短体线虫病的科学防治和安全生产提供参考。【方法】在室内条件下分别采用浸渍法和盆栽灌根法测定5种药剂对桑尼短体线虫的毒力和防效。【结果】5种药剂中41.7%氟吡菌酰胺SC对桑尼短体线虫毒力最强,LC_(50)为1.115 7 mg/L;2.5%高效氯氰菊酯EW毒力最低,LC_(50)为68.454 5 mg/L。41.7%氟吡菌酰胺SC和40%氟烯线砜EC灌根处理45 d后的线虫减退率分别为94.07%和97.07%,防效分别为84.67%和92.42%。【结论】41.7%氟吡菌酰胺SC和40%氟烯线砜EC对桑尼短体线虫的防效最好,建议在燕麦生产中推广应用。

【Objective】The study was performed to screen out the effective agents to prevent and control Prat-ylenchus thornei,so as to provide references for scientific control of this disease in oat safe production.【Method】The toxicity and control effect of five insecticides against P.thornei were determined by immersion method and pot root ir-rigation method respectively under indoor conditions.【Result】Among the five agents,41.7%fluopyram SC showed the strongest toxicity to P.thornei with LC_(50) of 1.1157 mg/L.The EW toxicity of 2.5%lambda-Cyhalothrin was the lowest,and LC_(50) was 68.4545 mg/L.After 41.7%fluopyram SC and 40%fluensulfone EC for 45 days of root irrigation,the reduction rates of P.thornei were 94.07%and 97.07%,and the control effects were 84.67%and 92.42%,respectively.【Conclusion】41.7%fluopyram SC and 40%fluensulfone EC showed the best control effect against P.thornei,suggesting that they should be popularized in oat production.