橘全爪螨春季高峰发生程度与气象因素的关系

本文探讨了橘全爪螨高峰发生程度与气象因素及天气过程的关系。结果表明：春季高峰由２次连续的高峰组成，且第二次高峰大于第一次高峰；第一次高峰发生在４月下旬到５月中旬，其发生程度主要受 ３月 ２０日～ ４月 ３０日气象因子和天气过程的影响，即日均温度≥ １２℃，降雨≤ ２ｍｍ、相对湿度（ＲＨ）≤８５％，持续时间越长发生程度越重；第二高峰发生在５月下旬至６月中旬，主要受５月１１日～６月 １０日气象因子和天气过程的影响，即日均温度 ２０～ ３０℃、降雨≤ １０ｍｍ的持续时间越长该螨的发生程度越严重。说明重庆地区橘全爪螨春季高峰严重发生的主要因素是在相应的时间内降雨少、气温变幅低，积温多和特定气象因子组合的天气持续过程。

The relationship between the occurrence peak of Panonychus citri(Mcgregor) in spring and the climatic factors .

The present paper dealt with the relationship between the occurrence peak in spring of citrus red mite, Panonychus citri (McGregor), and climatic factors as well as the climatic Process. The results indicated that the occur- rence peak in spring included twice-sustained peak, and the second peak was greater than the first peak. The first peak emerged from the end of April to the middle of May. Its' occurrence was mainly affected by the climatic factors and the process of 20 March to 30 April, with the daily mean temperature≥ 12℃, precipitation≤2mm, and the relative humid- ity≤85%. The second peak emerged from the end of May to the middle of May. Its' occurrence was mainly influenced by the climatic factors and the process of 11 May to 10 June, with the drily mean temperature 20-30℃ and precipitati- on≤10mm. The longer extended the sustained time, the greater the infestation. To sum up, the main factors which af- fect the occurrence peak in spring of citrus red mite in Chongqing were the lower precipitation, the smaller fluctuation of temperature, the greater accumulated temperature and the sustained times of the combination of the special climatic factors.