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苏联《植物保护》1974年第7期报道:1965年在巴什基里亚对乌尔根奇松树进行观察时发现,松毛虫所有茧的一半处在离地2米高的树干上。所以,可补充早期根据害虫茧来计算它的数量的方法。如果在穿过l公里被观察的林分行程中有5个茧,那末这标志着松毛虫的数量在增长。这个方法能够在害虫数量增长的早期阶段发现害虫。对茧的分析给予足够充分的关于害虫群体质量状况的情报:它的繁
The Soviet Union, “Plant Protection” 1974 No.7 report: In 1965 in Biskylia on the root of the Urgench pine found that all of the cocoon dendrolimus half off the ground 2 meters above the trunk. Therefore, the method of calculating its quantity based on pest cocoon earlier may be added. If there are 5 cocoons in the forested journeys observed over 1 km, this signifies an increase in the number of pine caterpillars. This method can detect pests in the early stages of pest population growth. Analysis of the cocoon gives sufficient information about the quality of the pest population: its complexity