论文部分内容阅读
通过对不同化学防治水平苹果园叶螨种群数量的调查、室内杀虫(螨)剂对叶螨相对毒性的测定以及对叶螨在苹果叶片上的分布及为害性状的考察表明:①频繁施用杀虫(螨)剂的果园.苹果全爪螨的种群数量明显大于李始叶螨种群数量;施用杀虫(螨)剂次数少的果园,李始叶螨的相对数量均高于苹果全爪螨;多年不喷洒杀虫(螨)剂的果园.李始叶螨种群数量占绝对的代势.②苹果全爪螨对三氯杀螨醇的扰性显著强于李始叶螨.③李始叶螨和苹果全爪螨在苹果叶片上存在着相互干扰.营养竞争等现象.进而证实田间大量使用三氯杀螨醇是促使兰州苹果园叶螨优势种演变的主要原因.并对压低苹果全爪螨发生基数和控制苹果园叶螨的防治对策进行探讨.
Through the investigation of apple tree mite population with different chemopreventive levels, the relative toxicity of indoor insecticide (mite) to spider mite and the distribution and damage of spider mites on apple leaves showed that: (1) (Mites) orchards.The population of apple mites is obviously larger than the population of mites, but the relative numbers of apple orchard mites are less than those of apple mites ; For many years, there was no pesticide (mite) agent in the orchards. The population of the species was the absolute surrogate .② The disturbance of dicofol on dicofol was significantly stronger than that on the leaf of spider mite. There is a mutual interference on the apple leaves and the phenomenon of nutrient competition and so on.And then it was confirmed that the large amount of dicofol utilization in field was the main reason to promote the dominant species of spider mite in Lanzhou apple orchard.And to reduce the base of apple mite and control apple orchard Spider mite prevention and control measures are discussed.