小菜蛾防治适期的研究

STUDIES ON THE CONTROL SUITABLE OCCASION OF DIAMONDBACK MOTH, PLUTELLA XYLOSTELLA L.

摘要: 本文应用二次回归通用旋转组合设计方法,研究了小菜蛾对菜心产量和质量的影响,建立了菜心产量和质量回归模型。对模型的分析发现菜心6～9叶期是小菜蛾为害引起菜心产量和质量下降的关键时期。本文还研究了小菜蛾对不同生长期菜心产卵选择性,结果表明:4～5叶期菜心上的着卵量最多,2～3叶期的菜心上的着卵量最小,综合上述研究结果,提出将菜心6～9叶期确定为小菜蛾防治适期。

Abstract: The control suitable occasion of the diamondback moth (DBM) was studied in Guangdong province.By means of rotation composite design of quadratic regression ,two methematical models were constructed to study the influence of the DBM on yield and quality of false pakchoi.The results showed that the sensitizing phase of false pakchoi to DBM was in the 6 to 9 lesf-stage.The results in experiment of the DBM selectively laying eggs showed that the most eggs were found in the 4 to 5 leaf-stage of false pakchoi.Therefore,the 6-9 leaf of false pakchoi was considered as suitable occasion for controlling DBM.