What are the control methods for sunflower sclerotinia rot?
To control sunflower sclerotinia rot, the first step is to practice crop rotation and remove diseased plant residues. Sunflower should be rotated with grass-family crops such as broomcorn millet, foxtail millet and corn, and continuous cropping with legumes and solanaceous crops should be avoided. The rotation period should be at least 3-5 years. At autumn harvest, remove the stalks as much as possible, dig out the root stubble and plow deeper than 10 cm. The next step is...
To control sunflower sclerotinia rot, the first step is to practice crop rotation and remove diseased plant residues. Sunflower should be rotated with grass-family crops such as broomcorn millet, foxtail millet and corn, and continuous cropping with legumes and solanaceous crops should be avoided. The rotation period should be at least 3-5 years. At autumn harvest, remove the stalks as much as possible, dig out the root stubble and plow deeper than 10 cm.
The next step is chemical control. This includes seed coating with 2.5% Shishile seed dressing agent at a ratio of 1:50 of pesticide to seed, or soaking the seed for 4 hours in a 500-fold dilution of 50% carbendazim wettable powder; to control the damping-off type, use 1 kg of procymidone wettable powder per mu mixed with an appropriate amount of sandy soil and, at sowing, spread it evenly into the furrows opened by the seeder; in the early stage of field disease, use procymidone or dimethachlon diluted in water and pour it around each plant, using 2-3 liang of solution per hole, applying once every 7-10 days, at least twice. To control head rot, use an 800-1000 fold dilution of 40% wenkuli (dimethachlon), vinclozolin or a 500-1000 fold dilution of 50% procymidone, or a 1000-fold dilution of 50% thiophanate-methyl (thiophanate-methyl), or a 500-fold dilution of carbendazim, spraying 2-3 times at 7-day intervals after full bloom.
In addition, growing disease-resistant varieties, mulching cultivation, changing equidistant planting to wide and narrow row planting, adjusting the sowing date, building disease-free seed production bases and implementing unified seed supply also have certain control effects.