What is sorghum smut?

What is sorghum smut? Please introduce and control sorghum smut occasionally in Northeast, Shandong, Inner Mongolia, Henan, Hebei and other areas. Caused by sorghum smut fungus. Symptoms: the disease appears at the panicle stage, the diseased plant is not dwarfed, usually the whole ear grain becomes an egg-shaped ash bag, the outer membrane is hard, does not break or only slightly split at the top, and the interior is full of black powder. After the diseased grain is pressed, the black powder is released, leaving a short and straight axis in the middle. Disease regularity: sorghum crushed diseased grains during threshing, thick chlamydospores attached to the healthy grain surface or mixed with spores in the seeds overwintering. Spread by seed. The optimum temperature for chlamydospore germination is 20-23 ℃. Lower temperature and higher humidity are beneficial to the disease. Prevention and control methods: 1. In agricultural measures, disease-resistant varieties should be selected according to local conditions. Crop rotation was carried out in seriously diseased fields. Sowing at the right time, strive for early emergence of seedlings, a whole seedling. two。 After screening, cleaning impurities and blighted seeds, the seeds treated with chemicals were treated with appropriate agents. The specific methods are as follows: one is to mix seeds with 50% trimethoprim according to 0.5% of the seed weight; the second is to mix seeds with 100 kg of 20% trimethoprim EC, add a small amount of water, mix seeds 100 kg, strive to mix evenly, spread out and dry, and sow seeds after drying; third, use 0.5 kg of 20% chlorhexidine EC, add 3 kg of water, mix 40 kg of seeds, sow for 4 hours, and sow seeds after drying. Click to get more sorghum planting technology click to get more grain planting technology