【摘要】 为建立秋花椰菜害虫防治指标,对长沙地区秋花椰菜鳞翅目害虫行动阈值进行了初步研究.在以菜青虫作为标准虫量,分别将其他食叶鳞翅目虫量折算成复合当量数的基础上,设计3种田间防治决策,即定期化学防治区、合理用药低指标区和合理用药高指标区.结果表明,以每株1头低龄菜青虫作为虫量的合理用药高指标区,防治效益为最好.更多还原

【Abstract】 We reported action threshold of lepidopterous pest attacking autumn cauliflower in Changsha. Three control strategies were compared from field trial by calculating each lepidopterous species occurring on plant to a compound equivalents by taking young larva of cabbage white butterfly (CWB), Pieris rapae L. as standard, The results showed that the best control strategy was reasonable spray at one larva of CWB per plant, when it was compared with periodic spray (conventional chemical spray) and reasonable spray at 0.5 larva of CWB per plant, respectively.更多还原