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根据凉山州立体气候的特点和粘虫发生为害情况,结合多年的实地调查、诱蛾观察和标记回收试验,初步明确了粘虫大发生世代有本地和外地两种虫源。本地一些低山地区终年都有粘虫存生。海拔1400公尺以下偏东南的部分地区有少量粘虫越冬,海拔2000公尺以下地区的小春作物上有零星的一代粘虫发生。二代粘虫大发生时,低山的一代粘虫可垂直飞往高山繁殖为害,成为大发生时部分虫源;高山二代粘虫发生为害后,又垂直飞往低山繁殖为害,在州内及其附近地区形成互为虫源,辗转为害的小循环。二代成虫大发生时有两个蛾峰,雌蛾卵巢发育级别和交尾情况很不一致。据资料分析和实地调查,粘虫大发生时蛾量的大小、时间的早迟,直接与我国东部地区江淮一带一代发生区粘虫的发生为害有密切关系。外来虫源主要来自江淮一带,这是决定大发生世代发生为害程度的主要成分。通过标记回收试验,使这两种虫源都得到了初步证实,从而为提高预测预报水平与防治策略,提供了重要的科学依据。
According to the three-dimensional climate of Liangshan Prefecture and the occurrence of armyworm disease, combined with years of field surveys, moth observation and mark recovery test, initially identified a large generation of armyworm occurrence of both local and foreign sources. Some local low-mountain areas have the survival of armyworms all year round. A small amount of armyworms overwinter in southeastern parts of the country at altitudes of up to 1400 meters and sporadic generations of sporadic armyworms occur on small spring crops at altitudes below 2000 meters. When the second generation of armyworms occurred, the low-generation armyworm could fly perpendicularly to the mountain for breeding and became part of the source of the large-scale occurrence of the armyworm. After the second generation of the southern armyworm had been damaged, the armyworm flew vertically to the lowland. Within and near the area to form each other as a source of insects, removed a small cycle of harm. There were two moth peaks when the second generation adults occurred, and the ovary development level and the mating situation of the female moths were very inconsistent. According to the data analysis and field investigation, the size of moth and the early and late time of the occurrence of armyworm were closely related to the occurrence of armyworm in the area of the Yangtze River-Huaihe area in the eastern part of China. The main sources of external insects come from the Jianghuai area, which is the major component that determines the extent of the occurrence of major occurrences in the past generations. Through the mark recovery test, these two kinds of insect sources have been initially confirmed, thus providing an important scientific basis for improving the prediction and forecasting level and prevention and cure strategies.