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 controleffect of five insecticides against Pratylenchus thornei

摘要:

【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，LC₅₀为1. 115 7 mg/L；2. 5% 高效氯氰菊酯EW 毒力最低，LC₅₀ 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。

Abstract:

【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】 Thetoxicity and control effect of five insecticides against P. thornei were determined by immersion method and pot root irrigationmethod respectively under indoor conditions.【Result】 Among the five agents，41. 7% fluopyram SC showedthe strongest toxicity to P. thornei with LC₅₀ of 1. 115 7 mg/L. The EW toxicity of 2. 5% lambda-Cyhalothrin wasthe lowest，and LC₅₀ was 68. 454 5 mg/L. After 41. 7% fluopyram SC and 40% fluensulfone EC for 45 days of rootirrigation，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 effectagainst P. thornei，suggesting that they should be popularized in oat production.