砜吡草唑对6种环境生物的毒性研究

Acute Toxicity of Pyroxasulfone to Six Environmental Organisms

[目的]明确砜吡草唑对6种环境生物的急性毒性。[方法]参照《化学农药环境安全评价试验准则》GB/T 31270—2014和《化学农药天敌(瓢虫)急性接触毒性试验准则》NY/T 3088—2017,开展了20%砜吡草唑悬浮剂对鸟、家蚕、蚯蚓、蜜蜂、赤眼蜂和瓢虫的急性毒性试验。[结果]20%砜吡草唑悬浮剂对日本鹌鹑7 d-LD_(50)>2000.0 mg/kg、家蚕4 d-LC 50为2942.87 mg/L、蜜蜂48 h-LD_(50)>100.0μg/蜂和蚯蚓14 d-LC 50>100 mg/kg,对寄生性天地赤眼蜂的安全系数为0.803,对七星瓢虫的安全系数为6.927。[结论]20%砜吡草唑悬浮剂对鸟、家蚕、蚯蚓、蜜蜂均为低毒,对七星瓢虫为低风险,对赤眼蜂为中等风险,对陆生生物友好。

[Objective]To confirm the acute toxicity of pyroxasulfone to terrestrial organisms.[Method]Tests were conducted according to“Test guidelines on environmental safety assessment for chemical pesticides”,GB/T 31270—2014 and“Chemical pesticide-Guideline for natural enemy(ladybird beetles)acute contact toxicity test”NY/T 3088—2017,and to test the acute toxicity of pyroxasulfone to six terrestrial organisms.[Result]20%pyroxasulfone SC for 7 d-LD_(50)of Coturnix japonica was>2000.0 mg/kg,4 d-LC 50 of Bombyx mori was 2942.87 mg/L,48 h-LD_(50)of Apis mellifera L was>100.0μg/bee,14 d-LC 50 of Eisenia foetida was>100 mg/kg;the safety factor of pyroxasulfone to Trichogramma japonicun Ashmead and Coccinella septempunctata were 0.803 and 6.927.[Conclusion]The herbicide is low toxicity to C.japonica,B.mori,A.mellifera and A.mellifera,low risk to C.septempunctata,and moderate risk to T.japzonicun Ashmead.So the herbicide is friendly to terrestrial organisms.