防治稻田黄毛鼠和板齿鼠的试验

烟草霜霉病(Peronospora tabacina Adam)是烟草作物的一种毁灭性病害,蔓延很广,遍及世界许多国家。鉴于我国无烟草霜霉病分布,因此,杜绝此病的传入,保护烟草生产,对来自疫区的烟叶实施检疫很有必要。烟草霜霉病传病的主要来源是分生孢子和卵孢子,但分生孢子与卵孢子比较,其抗逆能力差,寿命短,烟叶经晒干、贮藏、航运、加工等过程,随烟叶携带霜霉病分生孢子传病的可能性少。关于卵孢子,尽管萌发的具体情况不甚清楚,传播流行所起作用认

TESTS ON RODENTICIDE BRODIFACOUM AGAINST TAIWAN RAT (RATTUS RATTOIDE HODGSON) AND LARGE BANDICOOT RAT (BANDICOTA INDICA BECHSTEIN) IN RICE FIELD

Under the same application condition baits made of rice, with husk, containing 0.005% a. i. of Brodifacoum gave 91.8% control of Rattusrattoides Hodgeson and Bandicota indica Bechstein,while those made of rice without husk gave only 79.6% control. As a comparison, the efficacy of Diphacine-Na 0.2% bait was 96.2% kill. In-cage tests of Brodifacoum to Rattus rattoides Hodgeson under different conditions showed similar results with those of acute toxicants, but the rats died rather slowly and the dissect autopsy revealed an internal haemorrhage. Rat resistence has not yet developed in this region because Diphacine-Na was used as an first anticoagulant rodenticide. Brodifacoum is recommanded by the author as an candidate rodenticide once resistence appeared.