提高大白菜制种田种子产量和质量,除选择最佳组合,加强栽培管理和具备良好的隔离条件外,最关键的措施是如何保证授好粉。据调查,大白菜开花授粉阶段,正值蚜虫大量发生为害时期。以前,防治蚜虫多用乐果、辛硫磷及速灭杀了、敌杀死等。这些农药虽然灭蚜效果好,但同时也杀死了采蜜 Improve the yield and quality of Chinese cabbage seed production, in addition to choose the best combination, to strengthen the cultivation and management and have good isolation conditions, the most crucial measure is how to ensure the grant of powder. According to the survey, cabbage flowering pollination phase, aphid occurs when a large number of harmful period. Previously, the prevention and control of aphids and more with dimethoate, phoxim and quick kill, the enemy killed. Although these pesticides off aphids good effect, but also kill the mining honey