摘要
１５ａ的研究结果表明：在冀中南部果产区，山楂叶螨种群消长呈单峰曲线，不同年份或同一年份不同果园的发生高峰不同，梨、桃园发生在６月下旬至７月中旬，苹果园发生在６月中旬至８月上旬。发生高峰的温湿度界限指标是旬日均温度２６．１４±２．１１℃，日均相对湿度６１．６７％±８．９２％；在发育起点温度（９．２℃）与界限指标温度范围内，种群增长与有效积温呈高度正相关，符合线性函数ｌｏｇｙ＝－３．５５７４＋２．５１９５ｌｏｇｘ，在果园和树冠内的种群空间分布属聚集型；山楂叶螨危害苹果、梨、桃树造成早期落叶的螨口指标分别是叶均３１．７９、３２．３４、１９．４７头（均指雌成螨），叶片被害指数分别为６１．２７％、６０．０７％和５８．０１％。
The result of the research which lasted for fifteen years indicate that growth and decline curve of Tetranychus viennensis Zacher population in orchards is onehumped one.In the centre and south of Hebei Province,in the different or same years,in the different orchards,their occurrences are different.The peak occurs mainly from lateJune to midJuly in the pear and peach orchards.The peak occurs mainly from midJune to earlyAugust in the apple orchards.The demarcation index of the temperature and relative humidity of the peak is the average of ten days which are 26.14±2.11 ℃ and 61.67%±8.92% respectively. Between the starting development temperature(9.2 ℃) and the temperature demarcation index,the rising of population is a straight line interrates with the total effective temperature.The spatial distribution patterns of population in crowns and orchards are all determined as a aggregate type.In apple,pear and peach trees,the lowest pest density to cause early leaf fall are respectively 31.79,32.34 and 19.47 per leaf,the index of damage are respectively 61.27%、60.07% and 58.01%.
出处
《林业科学研究》
CSCD
北大核心
1998年第3期335-338,共4页
Forest Research
基金
河北省科委资助
关键词
山楂叶螨
种群动态
果园
危害
Tetranychus viennensis population dynamics orchard damage
