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省植保学会,省昆虫学会召开了河北省棉虫综合防治学术座谈会。与会专家认为,我省近年棉虫严重发生,1990年因三、四代棉铃虫危害减产皮棉达5000公斤,1991年棉花病虫防治面积,全省累计达11700万亩次,平均每亩治虫药费高达35元,多的上百元,是棉田投入最多的一项。还认为,棉铃虫、伏蚜等在“八五”期间,仍将是棉花增
Provincial Plant Protection Society, Provincial Entomological Society held a comprehensive symposium on cotton integrated control in Hebei Province. The experts attending the meeting said that in recent years, cotton mills in our province have been seriously affected. In 1990, the output of cotton bollworms was reduced by 5,000 kg due to the third and fourth generations of cotton bollworms. In 1991, the area of cotton pest control was 117 million mu. The average pesticide per mu Fees up to 35 yuan, more than a hundred dollars, is the largest investment in cotton one. Also believe that the cotton bollworm, such as aphids in the “Eighth Five-Year” period, will continue to be cotton