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杨圆蚧Quadraspidiotus gigas (Thiem et Gerneck),发生期的预测预报所采用的方法之一——期距法已有报导。此法是一个发育阶段盛期加上历期来预测下一发育阶段发生期。山于此法所得数据来自自然界群体,其历期不受个别虫体影响,实验接近自然界情况,但是必须结合当年温湿度,采集标本,进行短期观察,略作修改后方可使用。特别是反常年份的温度因子影响,虫期的历期往往有很大变化,在这种情况下,如果利用有效积温法,则可以消除以上缺点。
Quadranpidiotus gigas (Thiem et Gerneck), one of the methods used in the prediction of the occurrence period - the period method has been reported. This method is a growth stage plus the period to predict the next stage of development. The data obtained from this method come from the natural population. Its duration is not affected by individual parasites. Experiments are close to nature. However, it is necessary to collect specimens for short-term observations based on the temperature and humidity of the year and make a few modifications before using it. In particular, the influence of the temperature factor in anomalous years often changes greatly during the period of the worm stage. In this case, the above shortcomings can be eliminated if the effective accumulated temperature method is used.