Cotton blight is commonly known as rot disease and black root disease. Caused by Rhizoctonia solani, it is mainly parasitized and can also be rotted. The pathogenic bacteria overwinter in the soil or the diseased body with mycelium or sclerotia, and the sclerotia formed in the soil can survive for several months to several years. Rhizoctonia solani is resistant to adverse environmental conditions such as high temperature, freezing, and drought, and has strong adaptability. Generally, it can survive for several years, and is resistant to acid and alkali. It can grow in the pH range of 2.4 to 9.2. Therefore, the host range of the bacteria is extremely wide and widely distributed.
After the seedlings of cotton seedlings are damaged, yellow-brown spots appear on the bases of stems near the ground, gradually expanding, resulting in shrinkage of depressions. The depressions collapsed due to excessive water loss, then became dark brown and rotted and invaded. The cotton seedlings withered.
The initial infestation of blight is mainly from the soil, and the seeds of the bacteria can also be transmitted. Before the cotton seedlings are unearthed, Rhizoctonia solani can invade young roots and young shoots, resulting in rotten and rotten buds. Cotton seedlings are most susceptible to the cotyledon stage. If the soil temperature continues to be around 15°C or even cold or cold and rainy within 1 month after the cotton seedlings are unearthed, the blight will be severe and cause large dead seedlings. If it is cold and rainy before harvesting, the bolls will suffer and the germs will invade the interior of the seeds and become the source of initial infection for the next year. Seeding is too early, the temperature is low, the sprouting of cotton sprouts is slow, the infection time is long and the disease is heavy. For many years, the incidence of cotton fields was heavy. Poor terrain, poor drainage, and soil heavy weight in the cotton field are more serious.
Control methods:
1. Spray. In the early stage of illness, use Shilok (Shimadan) 10 ml + 5 ml love to receive a bucket of water, along with the main stem of the cotton spray, so that the liquid drip along the main stem into the soil, even spray 2 ~ 3 times is appropriate , 10 to 15 days apart. There are special effects on preventing the emergence of cotton seedlings.
2. Irrigation. At the beginning of the disease, 15 mg of schizocin and Tianda 2116 Zhuangmiaoling were used to irrigate the roots of a bucket of water, and it is advisable to infuse 2 to 3 times with an interval of 5 to 7 days.
3. Brushing. You can also use Shilok (Shimaidan) 10ml + 5ml love overdose or Shenzimycin 15ml + Tianda 2116 Zengmiaoling 25ml against 0.5kg water, splitting the soil around the cotton tree to expose the disease Spot, with a brush brushing, continuous 2 or 3 times is appropriate, interval 7 to 10 days.
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