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为筛选防治暗黑鳃金龟Holotrichia parallela的有效药剂,用浸虫法测定了7种药剂对暗黑鳃金龟幼虫的毒力,分别采用浸虫法、浸叶法、药膜法测定了7种药剂对其成虫的毒力,并通过大田试验作了进一步验证。浸虫法测得高效氯氟氰菊酯对成虫的毒力最高,LC50值为1.38 mg/L;浸叶法测得辛硫磷毒力最高,为42.05mg/L;药膜法测得毒死蜱毒力最高,为18.51mg/L。其中,高效氯氟氰菊酯毒力值变化最大,浸虫法毒力是浸叶法毒力的61.86倍;氯虫苯甲酰胺、氟虫腈在3种生测方法中毒力相当,但均较低。丁硫克百威对暗黑鳃金龟幼虫的毒力最高,LC50值为7.29 mg/L。田间试验结果显示,35%辛硫磷微囊悬浮剂4500 g/hm2(有效成分,余同)防效达80.66%,对花生的保果、增产幅度分别为77.90%、17.56%;30%毒死蜱微囊悬浮剂2 250 g/hm2、20%丁硫克百威乳油3000 g/hm2与辛硫磷防效相当,且显著高于其它药剂。因此,选用以上药剂于7月中下旬花生封垄前田间灌墩可以有效减轻暗黑鳃金龟为害。
In order to screen the effective agents for controlling Holotrichia parallela, the toxicity of seven agents to the larvae of Diabrotica alternatus was determined by the method of soaking insects. The insecticides, The virulence of adults was further verified by field trials. The results showed that the insecticidal activity of lambda-cyhalothrin was the highest, the LC50 value was 1.38 mg / L. The highest toxicity of phoxim was found to be 42.05mg / L by immersion method. Chlorpyrifos The highest virulence, 18.51mg / L. Among them, the cyhalothrin cyhalothrin virulence value changes the most, herbivore larvae virulence is about 61.86 times the leaf dipping virulence; chlorantraniliprofen, fipronil toxicity in three kinds of bioassay method, but both Lower. The toxicity of metsulfuron-methyl to benthic Larvae was the highest, with a LC50 of 7.29 mg / L. The results of field experiments showed that the control effect of 35% phoxim microcapsule suspending agent at 4500 g / hm2 (active ingredient, balance) reached 80.66%, and the peanut seed yield was increased by 77.90% and 17.56%, respectively. The 30% Microcapsule suspending agent 2 250 g / hm2, 20% metsulfuron-methyl ecstasy 3000 g / hm2 and phoxim control effect, and significantly higher than other agents. Therefore, the use of the above agents in mid-late July peanut ridge field irrigation can be effective in reducing the dark gills beetle damage.