论文部分内容阅读
在喀什疏附县,初步研究了杏树重要害虫吐伦球坚蚧(Rhodococcus turanicus Arch.)种群密度与杏树产量的关系,初步探明了吐伦球坚蚧对杏树的为害损失率,通过回归分析,建立了杏树损失率与吐伦球坚蚧种群密度的回归模型为:Y=15.724 Ln(X)+59.543(Y为产量损失率,X为吐伦球坚蚧种群密度,单位为头/cm~2),相关系数(R~2)为0.896;在此基础研究了在不同价格与不同药剂防治吐伦球坚蚧的经济阈值和投入产出比。
In Kashgar Prefecture, the relationship between population densities of Rhodococcus turanicus Arch., An important apricot tree species and the yield of almond trees was preliminary studied. Through regression analysis, the regression model of loss rate of almond tree and population density of Tuodospuridae is established as follows: Y = 15.724 Ln (X) +59.543 (Y is yield loss rate, X is population density of Tuodosporidae, For the first / cm ~ 2), the correlation coefficient (R ~ 2) was 0.896. Based on this, we studied the economic threshold and input-output ratio of Tuodomens chinensis under different prices and different agents.