杨树水泡型溃疡病药剂防治试验

杨树水泡型溃疡病试验结果表明;抗菌素杀菌剂对病菌孢子萌发和菌丝生长效果较差。病原菌具有潜伏侵染特性,所以药剂防治应放在消灭侵染源的分生孢子上。由于杨树树皮组织纤维较厚,对药剂忍受能力较强,不易发生药害,一般的杀菌剂如石硫合剂等作用较差。经试验证明40%福美砷50倍、50%退菌特100倍、70%甲基托布津100倍、50%多菌灵100倍,防治效果较好。防治时期在8月上旬至中旬的孢子飞散的高峰中进行为适宜。为了解决杨树水疱型溃疡病对杨树造成的危害,自1977年以来,在鉴定病原及对发病规律研究的基础上选取了一些生产上常用的化学杀菌剂、抗菌素杀菌剂及其它一些新型的杀菌剂进行了防治试验,以便找出一些防治本病较好的有效杀菌剂。

THE FUNGICIDAL EFFECT ON THE CONTROL OF POPLAR BLISTER CANKER

On the trial of a number of antibiotics and chemical fungicides to the poplar blister canker, it was found that the antibiotics was not as good as some chemical fungicides. Owing to the latent infection of the fungus and the thickness of the tree bark, the non penetrating fungicides, such as lime-sulphur was not effective, while, 40% 3-(di me-thyl-dithio-carbamate) Arsenie×60, 50% Terzet ×100, 70% Topsin-M ×100, 50% Bovistin ×100 showed better infiltration and control effect. The period of control was more suitable in early to mid August when it was the high tide of condial dissemination.