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为明确嘧菌酯等杀菌剂及其混配制剂对赤眼蜂的毒性,评价含嘧菌酯混配制剂的风险性,本文采用管测药膜法测定了嘧菌酯等杀菌剂及其混配制剂对玉米螟赤眼蜂Trichogramma ostriniae的毒性,并进行安全性评价。结果表明:在杀菌剂单剂中,以嘧菌酯和百菌清对玉米螟赤眼蜂的毒性最高,LR50分别为1.31×10-4和9.59×10-4a.i.mg/cm2,为高风险药剂;丙环唑、苯醚甲环唑和己唑醇对玉米螟赤眼蜂的毒性较低,LR50分别是2.34×10-3、4.83×10-3和2.60×10-3a.i.mg/cm2,为中等风险性药剂;戊唑醇和烯酰吗啉的毒性最低,为低风险性药剂。在混配制剂中,只有嘧菌酯·百菌清对玉米螟赤眼蜂不安全,LR50是1.85×10-3a.i.mg/cm2,为高风险性药剂;嘧菌酯·己唑醇、嘧菌酯·烯酰吗啉和嘧菌酯·苯醚甲环唑对玉米螟赤眼蜂的毒性较低,LR50分别是8.96×10-4、3.17×10-3和1.65×10-2a.i.mg/cm2。嘧菌酯·丙环唑和嘧菌酯·戊唑醇对玉米螟赤眼蜂安全。两种杀菌剂混用对赤眼蜂生态风险性取决于单剂本身的毒性大小和在混剂中所占比例,嘧菌酯和高风险药剂混用,其混剂的风险性高;嘧菌酯和低风险药剂混用,其混剂的风险性会低于嘧菌酯。因此,在大田释放赤眼蜂防治玉米螟等害虫时,应避免高风险杀菌剂的使用,以避免对赤眼蜂的伤害。
In order to clarify the toxicity of azoxystrobin and other fungicides and their mixed formulations on Trichogramma and to evaluate the risk of azoxystrobin mixed formulations, the azoxystrobin and other fungicides and their mixed fungicides Toxicity of the formulation to trichogramma ostriniae and its safety assessment. The results showed that azoxystrobin and chlorothalonil were most toxic to Trichogramma ostriniae in a single dose of bactericides with LR50 of 1.31 × 10-4 and 9.59 × 10-4a.i.mg / cm2, respectively High-risk agents; propiconazole, difenoconazole and hexaconazole were less toxic to Trichogramma ostriniae with LR50 of 2.34 × 10-3, 4.83 × 10-3 and 2.60 × 10-3a.i, respectively. mg / cm2, which is a medium-risk drug; tebuconazole and dimethomorph have the lowest toxicity and are low-risk drugs. In the mixed formulation, only azoxystrobin and chlorothalonil are not safe to Trichogramma ostriniae, LR50 is 1.85 × 10-3a.i.mg / cm2, which is a high-risk agent; azoxystrobin and hexaconazole Azoxystrobin and azoxystrobin difenoconazole were less toxic to Trichogramma ostriniae with LR50 of 8.96 × 10-4, 3.17 × 10-3 and 1.65 × 10-2a, respectively .i.mg / cm2. Azoxystrobin, Propiconazole, Azoxystrobin and Tebuconazole for Trichogramma ostriniae. The ecological risk of Trichogramma mixed with two kinds of bactericides depends on the toxicity of the single agent itself and the proportion in the mixture, and the combination of azoxystrobin and high-risk agent has high risk of mixture; Low-risk agents mixed, the risk of mixed agents will be lower than azoxystrobin. Therefore, in the field to release Trichogramma bug control corn borer, the use of high-risk fungicide should be avoided to avoid the Trichogramma injury.