华北棉区第三代棉铃虫对棉花为害损失与经济阈值的研究
Damage to cotton and economic threshold of third generation cotton boll worm in northern China Cotton Area
三代棉铃虫发生程度与气象条件关系的贝叶斯判别
Bayes Discrimination on Relationship between Occurrence Degree of the 3 ~ ( rd ) Generation Bollworm and Meteorological Condition