Cotton blight, commonly known as rot disease, black root disease, low temperature and rainy weather conducive to the occurrence of the disease. From April 22 to April 24, most of the cotton fields in our province had moderate to heavy rain. At this time, it was cotton seedlings that had been unearthed or had just emerged. Cotton Blight should be controlled.
First, the symptoms identified before the emergence of cotton seedlings, often infecting young roots, shoots, resulting in bad shoots, bad species. After unearthed cotton seedlings were damaged, they initially produced yellow-brown spots on the stem base near the ground, and then they gradually expanded, resulting in depressions and depressions. The depressions collapsed due to excessive water loss, eventually turning into dark brown and rot. The cotton seedlings are withered and wilted. It is easy to pull out of the soil. This is the main feature of the disease.
Second, the epidemic characteristics of the disease of bacteria with mycelium or sclerotium in the soil or sickness on the winter, the sclerotia formed in the soil can survive for several months to several years. 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 within 1 month after the cotton seedlings are unearthed, and even cold or low temperature and rain are encountered, blight will occur seriously and cause large dead seedlings. If it is cold and rainy before harvesting, the cotton bolls will suffer and the germs will invade the interior of the seeds and become the first source of infection for the next year. Premature sowing, low temperatures, late germination of cotton seeds, slow emergence, and a long period of time infestation caused the disease to be heavy. For many years, the incidence of cotton fields was heavy. Low-lying, poor drainage and soil-heavy cotton fields are more serious.
Third, control methods
1. Agricultural control. The selection of disease-resistant varieties and seed coating was used to strengthen seedling management. After the emergence of cotton seedlings, cultivators will begin to cultivate cultivars. After rain, cultivators should be cultivated in time to reduce soil moisture and increase ground temperature. If the cotton seedlings begin to develop, they can be placed on the film to deepen the cultivator, so that the soil can be ventilated, scattered, and warmed, and the diseased seedlings can grow new roots as soon as possible. The cotton seedlings grow 3 to 4 true leaves, and the stems are gradually lignified and can resist Bacteria infestation. If there are already dead seedlings, spray 0.1% potassium permanganate water at the dead seedlings to reduce the spread of germs. And timely timely seedlings, timely removal of diseased seedlings. Be careful not to expose the mulching film prematurely. Otherwise, the low temperature during the night is not conducive to relieving the disease.
2. Drug control. 1 spray. In the early stage of disease, use 10ml of Gelato or Shimaidan + 5ml of love to receive more or Shenximycin 15ml + 15ml of chlorophyll to a bucket of water (15kg), and spray along the main stem of the cotton seedling to make the medicine The liquid is dripped into the soil along with the main stem and sprayed for 2 or 3 times in succession. The interval is 10 to 15 days. It has special effects for controlling the emergence of bacterial wilt in cotton seedlings. 2 Irrigation. At the beginning of the disease, 15 ml of rosinazine + 15 ml of chlorophyll + 20 g of P and K power impelled the root of a bucket of water, and it was fed 2 or 3 times. The interval was 5 to 7 days. 3 brushing. With 10 ml of Gelato or Shima Dan + 5 ml love to receive or 15 ml of ketoxacin + 15 ml of chlorophyll, for 0.5 kg of water, open the soil around the cotton tree to expose the lesion, with hair Brush brush, continuous brushing 2 to 3 times, interval 7 to 10 days.
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