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为了掌握保铃棉对棉铃虫抗性表现的时间和程度，我们设计了系统的试验方案。但因１９９８年气候异常，使试验未能按计划实施。现把１９９８年实际所做的调查内容及结果报告如下。一、棉铃虫第２代卵定点调查于６月２３日定点（挂牌）观察卵１８粒，６月２４、２５日连续２天中
In order to grasp the time and extent of bollworm resistance to bollworm, we designed a systematic test protocol. However, due to the abnormal climate in 1998, the trial failed to be implemented as planned. The survey contents and results actually made in 1998 are reported below. First, the second generation of cotton bollworm eggs survey in the fixed point on June 23 (listed) 18 eggs observed in June 24, 25 for 2 days in a row