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菜青虫是甘蓝上的主要害虫之一，由于长期农药的不合理使用，该虫对常规农药已产生抗性。为确定新型生物杀虫剂—2．5％生物碱水剂对菜青虫的防治效果，我们于1998年7月进行了田间药效试验，现将结果报道如下。一、材料与方法1．材料供试药剂为2．5％生物碱水剂（三川药业公司
Pieris rapae is one of the major pests on cabbage and has become resistant to conventional pesticides due to the irrational use of long-term pesticides. To determine the effectiveness of the new biopesticide -2.5% alkaloid aqueous solution on cabbage worm, we conducted a field efficacy trial in July 1998, and the results are reported below. First, materials and methods 1. Materials for the test agent 2.5% alkaloid agent (Sanchuan Pharmaceutical Company