开春后,气温回升,油菜进入旺盛时期。为确保油菜高产,春后必须切实抓好以下“五防”: 防渍害。开春后,雨水逐渐增多,排水防渍是油菜春管的当务之急。因此,春后必须清理“三沟”(主沟、围沟、畦沟),排除田间积水,以消除渍害。 防病虫。油菜春后主要病虫害有菌核病、病毒病、霜霉病和蚜虫等,尤以菌核 After the spring, the temperature rose, rape into the strong period. In order to ensure the high yield of rapeseed, the following “five defenses” must be effectively implemented after spring: stain-proofing. After the spring, the rain gradually increased, drainage stains is rape spring pipe urgent task. Therefore, after spring, “three ditches” (main ditch, ditch and ditch) must be cleared to eliminate stagnant water in the field so as to eliminate the stains. Pest control. The main pests and diseases of rape are sclerotinia, viral diseases, downy mildew and aphids, especially in the sclerotia