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油菜根腐病,又称立枯病、纹枯病。病菌发育最适宜温度25℃左右。高温、连阴雨天气多、光照不足易染病。一般在遭受连阴雨造成烂根烂种现象。土壤黏重、苗龄过长及田间排水不畅、湿度大发病重。其防治措施如下。实行轮作。油菜植播地尽量做到不连续两年重播,避开与十字花科作物重茬。苗床处理按每667平方米施石灰粉50千克或70%敌磺钠可湿性粉剂1千克加细土30千克拌匀撒施在苗床上,拌匀成药土,播种前撒施畦内,进行土壤处理。确定合理的播种量,苗床要在3叶期后及时间苗,除去病、弱
Rape root rot, also known as blight, sheath blight. Pathogen optimum temperature 25 ℃. High temperature, even cloudy and rainy weather, light enough to easily infected. Generally suffer from rotten roots caused by rotten rainy phenomenon. Soil sticky weight, long seedling age and poor field drainage, humidity, heavy illness. The prevention and cure measures are as follows. Implement rotation. Brassica napus planting as far as possible to do two consecutive years of replay, avoid cruciferous crop stubble. Seedbed treatment per 667 square meters of lime 50 kg or 70% of the enemy Sulfonic sodium WP 1 kg plus fine soil 30 kg spread evenly in the seedbed, mix well into the soil, sowing before sowing, soil deal with. Determine a reasonable sowing, seedbed in the 3-leaf period and time seedlings, remove the disease, weak