The main diseases for the timely prevention and control of pests and diseases are virus disease, sclerotinia, white rust and downy mildew; the main pests are aphids and stem stalks. In winter, the climate is warm, and it is rainy in spring. When the temperature rises slowly, pests and diseases are easy to occur.
It is important to pay attention to boron- and boron-assisted rapeseed hybrids, which are more sensitive to boron, and boron deficiency is not conducive to the exertion of their heterosis. Phosphorus deficiency affects nutrient accumulation, poor grain plumpness, and increased seed pods. Boron and phosphorus should be sprayed in the middle and late March. 100 grams of borax and 100 grams of potassium dihydrogen phosphate plus 50 kilograms of water are sprayed on the mu, preferably with the combination of boron spray, phosphorus spraying, and pest control. The method is 100 grams of borax per mu, 100 grams of potassium dihydrogen phosphate, 1000 grams of urea plus omethoate or phoxim 50 ml plus 50 kg of water, dissolve spray and mix. It is better to spray on sunny afternoons.
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