6.防病治虫近几年,向日葵的菌核病和向日葵螟危害最严重,不应忽视防治。菌核病:又叫白腐病,俗称烂盘病。发病率一般在50%左右,严重时可达80%以上,轻者造成减产减收,重者颗粒无收。防治方法:可根据发生规律喷撒农药,当气温达18-20℃,0—5厘米深表土含水量在11%以上时,越冬的菌核开始萌发,即子囊盘出土,这是地面撒药的最佳时间。每公顷用 6. Prevention and control of pests In recent years, sunflower sclerotinia and sunflower borer hardest hit, prevention and treatment should not be ignored. Sclerotinia: also known as white rot, commonly known as rotten disease. The incidence is generally about 50%, severe up to 80% or more, the light caused by the reduction of production and reduction, those with serious crop failure. Control methods: Pesticides can be sprayed according to the law of occurrence. When the temperature reaches 18-20 ℃ and the surface soil moisture of 0-5 cm deep is above 11%, the sclerotia overwinter begins to germinate, that is, The best time Used per hectare