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美国现在正在研究用低剂量和应用方法简单的农药以扑灭作物病害。他们最近发明几种内吸杀菌剂。这类杀菌剂只以低剂量施用1-2次,就可使春小麦在整个生长期不发生锈病。这类杀菌剂一般只对某些病原微生物有选择性毒力。 在这类杀菌剂中,最有希望的是4-正-丁基-1,2,4-三唑,其作用的特点是只对叶锈病才有防治效果,而且使用极低剂量效果也很好。在盆栽试验中,于4英寸(1英寸=2.54厘米)盆的土中施入几微克,就可使麦苗不受叶锈病感染;在田间试
The United States is now studying the use of low-dose and simple pesticides to combat crop diseases. They recently invented several systemic fungicides. This type of bactericide can be applied only 1-2 times at low doses to prevent the spring wheat from rusting throughout the growing season. Such fungicides are generally selective for some pathogenic microorganisms. Of these fungicides, the most promising is 4-n-butyl-1,2,4-triazole, the role of which is characterized by only the prevention and treatment of leaf rust disease, and the use of very low dose effect is also very it is good. In a pot experiment, a few micrograms of soil was applied to a 4 inch (1 inch = 2.54 cm) pot of soil so that the barley seedlings would not be infected with leaf rust;