溴杀灵对达乌尔黄鼠毒效的评价

Evaluation of the effect of Bromethalin against Cieellus dauricus

溴杀灵对达乌尔黄鼠一次口服毒力为2.3747mg/kg,95%可信限为1.1918～2.8305mg/kg。达乌尔黄鼠对0.01%、0.05%和0.1%溴杀灵玉米毒饵的摄食系数分别为1.4686、0.7748和0.8377。无拒食反应,有一定的蓄积毒性。黄鼠中毒死亡时间为1～3天。具典型的神经中毒症状。解剖观察以肺出血、淤血为主;显微镜下可见各脏器有程度不同的出血病变;脑实质内有较多的筛网状软化灶,内有小胶质细胞增生、神经细胞坏死。现场用0.1%溴杀灵玉米毒饵每洞10粒,3天时校正灭洞率为94.12%。我们认为,溴杀灵对达乌尔黄鼠具有毒力强、死亡时间适中、适口性好、灭效高的特点,是疫区处理或特殊环境灭鼠较为理想的灭鼠药物之一。

Acute LD_(50) of bromethalin against citellus dauricus per os was 2.3747mg/kg. The confident limitation in 95% was 1.1918—2.8305mg/kg. The coefficient of taken maize baits at concentration of 0.01, 0.05 and 0.1% of pesticide agent for c.dauricus were 1.4686, 0.7748 and 0.8377, respectively. The rodents have no dietary rejected reaction for baits. It gave some accumulating toxication-After toxicosis the death period of c.dauricus would take 1—3 days.It is a typical neuro-toxicant symptom that including congestion and bleeding in lung was mainly pathological features could founded by autopsy. In other internal organs hemorrage and congestion fncusrwere also founded in certain extent. Under the microscope a large amount of the encephalo-malacia focus in parenchyma region, small neurglia cell hyperplasia and neurogen necrosis were very common phynomena. 0.1% of Bromethalin maize baits. 10 pieces per borrow putting the killing rate was 94.12%, after three days calculated the rate of distinct borrow. The results confirmee that Bromethalinbbaits possessed very stronger toxicity for c.dauricus, death period is mild and palatable for rodents and is suitable useing for dealing with natural focus, is ideal rodenticide for pest control.