期距预测法使用简便,适于作中期预测的参考。据此,今将我站通过实践所得的有关红铃虫期距方面的多年资料,按虫态和世代间的期距、期距变异原因及其预测方法,整理报告于后。 一、期距观察结果 根据1958—1967年的室内饲养和1960—1977年的田间调查资料统计分析,得知红铃虫各世代和虫态间的期距历年变异较大,如越冬红铃虫化蛹高峰至羽化高峰的期距,最长的1976年18天,最短的1967年仅9天,平均14 The period prediction method is easy to use and suitable for reference of medium-term prediction. Accordingly, I will stand through this practice for many years on the pink bollworm long-term data, according to the state of insects and intergenerational period, the causes of variation and its prediction methods, organize the report later. First, the long-term observation results According to 1958-1967 indoor rearing and 1960-1977 field survey statistical analysis, that the pink bollworm generation and the long-term variations in the period between the pest over the years, such as overwintering Pupa peak to eclosion peak period, the longest in 1976 18 days, the shortest in 1967, only 9 days, an average of 14