1. Damage and Occurrence: White rust in rape: After the leaves are damaged, a slightly shiny, white, and glossy, abscess-like lesion grows on the back of the leaves. After the young stem and the flower axis are injured, it swells and bends like a “tap”, giving birth to white. Sable spots. : Rapeseed downy mildew: Injury to the mouth of 10 pieces, when the air is wet, grow a layer of creamy moldy layer on the back. The disease first developed from the bottom lobe and gradually spread upwards. When the disease was severe, the leaves fell off and the plants withered. After the pedicel is damaged, it becomes fat and swollen, resembles a "leading cane" and has a frosty moldy layer. Scarf white rust and downy mildew are all specialized parasites. Their infection and transmission processes are basically the same and they are transmitted through wind and rain. During spring rape blossoms and scabs, when the cold wave is frequent, cold and warm weather is severe.

2. Control methods: In addition to strengthening agricultural technology measures, it is mainly pharmaceutical protection. At the beginning of the disease, 43% Dashengfu suspension agent was used 600-800 times; after the onset, 66.8% mildew WP was used 500-600 times.

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