DDVP缓释剂熏杀长尾黄鼠寄生蚤的现场实验

A Field Trial of the Control of Fleas on Citellus undulatus by Fumigating with DDVP Slow-releasing Pellets

1988年5～8月在新疆精河县南山鼠疫疫源地内,我们利用DDVP缓释剂对长尾黄鼠寄生蚤进行了现场熏杀实验,实验面积约150公顷,施药后实验区内的黄鼠寄生蚤指数明显低于对照区P<0.01),黄鼠血清学阳性率亦明显低于对照区(P<0.01),体蚤、巢蚤、幼虫指数和黄鼠血清学阳性率分别由施药前的8.8,16.2,13和44%下降到施药后66天的0.4,0.6,0.2和7%;而对照区内的则分别由3.6,2.4,0和21％上升到7.6,28.4,43.2和31％。施药前在实验区和对照区抽检的黄鼠经细菌学检验,皆为阴性,而对照区在施药后检出2株鼠疫强毒菌。

On the basis of the successful tests both at the laboratory and in the field in 1987, a further field trial of flea control was conducted in the Citellus undulatus plague focus in Jinghe County by fumigating with DDVP slow-releasing pellets in 1988. A grid encompassing 15 ha. was established. After exposure, the indices of fleas and positive rate of sera from C. undulatus in the test area were significantly lower than in the control area (P<0.01). The indices of fleas on the rodent, in the nests, the larva index and the positive rate of sera from C. undulatus dropped from 8.8, 16.2, 13 and 44% to 0.4, 0.6, 0.2 and 7% after 66 days exposure while in the control area, the same indices and rate changed from 3.6, 2.4, 0 and 21 % to 7.6, 28.4, 43.2 and 31%, respectively. Before exposure, neither area was bacteriologically positive, after the exposure, however, 2 strains of virulent Y. pestis were isolated from the control area.