6种杀虫剂对玉米穗期主要鳞翅目害虫毒力及防效评价

为明确不同类别杀虫剂对玉米穗期主要鳞翅目害虫的防控应用前景，采用人工饲料混药法测定6种杀虫剂对棉铃虫(Helicoverpa armigera)、玉米螟(Ostrinia furnacalis)、桃蛀螟(Conogethes punctiferalis)幼虫的毒力，通过田间药效试验评价其对玉米穗期害虫的防治效果。室内毒力测定结果表明，氯虫苯甲酰胺、四氯虫酰胺、甲氨基阿维菌素苯甲酸盐、虫螨腈对棉铃虫、玉米螟、桃蛀螟具有较高的室内毒力，LC₅₀值分别在0.29～0.51、0.17～0.51、0.03～0.20、0.61～8.32 mg/L；辛硫磷毒力最低，对3种害虫毒力分别为127.76、80.57、62.11 mg/L。田间药效试验表明，6种杀虫剂对玉米穗期害虫均表现出一定的防治效果，氯虫苯甲酰胺、四氯虫酰胺、甲氨基阿维菌素苯甲酸盐、虫螨腈各处理对穗虫防治效果较高，防效在73.29%～83.52%，显著高于甲氧虫酰肼、辛硫磷各处理防效，能有效控制玉米穗期害虫危害。综合室内毒力、田间药效试验，氯虫苯甲酰、四氯虫酰胺、甲氨基阿维菌素苯甲酸盐、虫螨腈在玉米穗期害虫防控上具...

Toxicity and Field Efficacy of Six Insecticides to Main Lepidoptera Pests in Ear Period of Maize

In order to evaluate the application prospect of different types of insecticides on maize to control main Lepidoptera during the maize tassel stage, the toxicity of six insecticides to Helicoverpa armigera, Ostrinia furnacalis and Conogethes punctiferalis were determined by Diet incorporation method, and then their control efficiency was evaluated by field tests. The results of toxicity tests showed that chlorantraniliprole, tetrachlorantraniliprole, emamectin benzoate and chlorfenapyr had higher toxicity to H. armigera, O. furnacalis, C. punctiferalis, with the value of LC₅₀ were 0.29-0.51 mg/L, 0.17-0.51 mg/L, 0.03-0.20 mg/L and 0.61-8.32 mg/L, respectively. The toxicity of phoxim was the lowest to H. armigera, O. furnacalis and C. punctiferalis, with the value were 121.01 mg/L, 80.39 mg/L, 63.48 mg/L. The field efficacy test of six insecticides showed certain control effects on maize pests in ear period. Each treatment of chlorantraniliprole, tetrachlorantraniliprole, emamectin benzoate and chlorfenapyr has a high control effect on those pests, with the control effect were 73.29%-83.52%, significantly higher than the treatment of methoxyfenozide and phoxim, and can effectively control the damage of pests. Based on the toxicity and field efficacy tests, chlorantraniliprole, tetrachlorantraniliprole, emamectin benzoate and chlorfenapyr have good application prospects in the control of maize ear pests. In the field control, appropriate pesticides can be reasonably selected.