Cotton blight, also known as rot disease or black root disease, is caused by the fungus *Rhizoctonia solani*. This pathogen can infect cotton seeds before they germinate, leading to poor germination and the development of rotten buds. Once the seedlings emerge from the soil, yellowish-brown lesions appear at the base of the stem near the soil surface. These lesions gradually expand and encircle the stem, eventually causing the plant to wilt and die.
Senior agronomist Zhang Chuanyi explained that cotton blight is a common soil-borne fungal disease that affects cotton during its early seedling stage. After the application of plastic mulch, the seedlings may struggle to adapt to the new environment, making them more vulnerable. Combined with low temperatures and frequent rainfall, these conditions create an ideal environment for the disease to thrive.
The primary sources of infection include the mycelia, sclerotia, and bacterial carriers present in the soil, as well as infected plant debris. When seedlings grow slowly or weakly, they become more susceptible to infection. The cotyledons are particularly vulnerable to the disease. According to Zhang Chuanyi, one effective control method is to apply irrigation or foliar sprays. When spraying leaves, it's important to do so slowly to ensure the solution penetrates the rhizomes, helping to prevent the occurrence of blight.
**Seed Treatment Method 1:** For 10 kg of cotton seeds, mix 2–3 pounds of water with 0.5 g of 99% bavistin and soak the seeds after drying. Use Tianda 2116 dip and seed-type bag for coating.
**Method 2:** Prepare a solution of 50% carbendazim diluted 800 times or 70% thiophanate-methyl diluted 800 times, combined with 70% mancozeb manganese at 600 times dilution.
**Method 3:** Mix Tianda 2116 Zhuangmiaoling at 600 times dilution with 99% xylloxane at 3000 times dilution for foliar spray or root irrigation.
These methods help protect young cotton plants from the damaging effects of cotton blight, ensuring healthier growth and better yield.
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