Prevention and control of diseases and insect pests and common physiological diseases in broccoli with good quality and high yield

Broccoli has strong disease resistance and seldom occurs in normal years. However, the planting is too dense, continuous rain, poor drainage in the field, black rot, root rot, downy mildew and other diseases will occur. The disease is mainly prevented. In addition to strengthening the moisture management, the lower diseased leaves should be removed in the later growth stage to improve the ventilation and light transmission conditions. After 15 days of planting, the 600-fold solution of 72.2% aldicarb or 500-fold solution of 75% chlorothalonil combined with 800-fold solution of new high lipid membrane can be sprayed to prevent and control downy mildew every 10-15 days. 72% agricultural streptomycin 3000 times solution or 77% wettable powder 1500 times solution combined with new high lipid membrane 1500 times solution can be used alternately for 2-3 times to prevent root rot. The main pests are Pieris rapae, Plutella xylostella, aphids, Spodoptera litura and so on. 2.5% vegetable Xi 1000 times solution, or 5% Regent 1500 times solution, or 0.3% matrine 3000 times solution can be used to control Pieris rapae and Plutella xylostella. Aphids can be controlled with 2000 times of imidacloprid or 2000-3000 times of aldicarb. Spodoptera litura can be controlled with 2000-3000 times of Yitaibao.