新疆北疆地区三叶草夜蛾种群动态研究

Population Dynamics of Clover Cutworm Scotogramma trifolii( Rottemberg) in Northern Xinjiang

【目的】分析新疆北疆地区三叶草夜蛾Scotogramma trifolii（Rottemberg）田间长期监测数据,掌握其种群发生过程及特点,为田间有效防治提供科学依据。【方法】应用黑光灯对石河子垦区农田三叶草夜蛾进行长期定位监测,采集相关数据并分析北疆地区三叶草夜蛾种群的年际变化以及年内种群消长规律。【结果】在新疆北疆地区,三叶草夜蛾种群数量年际间存在较大波动,且呈周期性波动,周期为4~5 a;三叶草夜蛾年内变化规律为,一般始现于4月中下旬,越冬代的蛾量高峰为5月中旬、第一代的蛾量高峰为6月中下旬、第二代的蛾量高峰出现在7月下旬至8月上旬;个别年份会出现第三代高峰。【结论】新疆北疆地区三叶草夜蛾年际间种群数量呈周期性波动,周期为4~5 a;年内共发生3~4代,全年蛾量高峰期在每年的5~7月。

【Objective】The project aims to explore the population dynamics of clover cutworm Scotogramma trifolii Rottemberg in the field in the hope of providing basic information for effective prevention and control of it in Northern Xinjiang.【Method】The monitoring of clover cutworm Moths was carried out by black- light trapping in Shihezi. We analyzed among- year and within- population variation,using the monitoring date in17 years from 1982 ~ 2001 in Northern Xinjiang.【Result】The results showed that the population of clover cutworm had the characteristic of periodic fluctuation among years and with the cycles of 4- 5 years. The population annual variety regulation of clover cutworm showed that the moths of clover cutworm were generally found in mid- April or late- April. The overwintering generation peaked numerically in mid- May,the first generation in mid and late June,the second generation in late July and early August,and the third generation peaked occasionally in Northern Xinjiang.【Conclusion】There was a periodic fluctuantion of the population of clovercutworm,which was 4- 5 years. The clover cutworm developed 3 ~ 4 generations in a year,and the peak of moths was form May to July each year.