First, the basic situation to the end of April, Shandong Dongying City, cotton planting nearly 145 million acres, the majority of cotton fields are currently in the emergence period. The comprehensive forecast of disease at the seedling stage of cotton was moderately heavy. The disease that damages the cotton seedling stage in our city is mainly cotton blight, and it is often mixed with cotton seedling anthracnose and red rot. II. Etiological Analysis After investigation and discussion, this year's cotton seedling disease occurrence in Dongying City was mainly due to the following reasons: First, climate factors. Climatic factors are the main reason for the induction of cotton seedling disease. The period from the end of April to the beginning of May is the key period for cotton sowing and emergence in our city. The climatic conditions in this period have a great influence on the growth of cotton seedlings. In the second half of April, the city’s average precipitation was less than normal. In early May, the precipitation was more than normal, and the temperature was slightly higher than normal, which was very favorable for the infection of cotton seedlings. The second is the heavy factor. More than 80% of the cotton field plots in our city are planted with heavy crops. The amount of soil in the cotton fields is large, causing serious disease. Third, improper treatment of seeds. According to the survey, 35% of the cotton seed planted on the plot is a hair seed, and no seed dressing is required before sowing. Fourth, improper application of herbicides. Some farmers in the application of pre-emergence herbicide, blindly increase the amount of medication, due to high soil moisture, cotton seedlings absorb large amounts of herbicides, it is easy to form phytotoxicity, resulting in dead seedlings. Third, the response measures First, remove diseased plants. After the emergence of cotton seedlings, and time seedlings, fixed seedlings and cultivator loose soil. When the seedlings and the seedlings are seedlings, they adhere to the principle of “weakness, disability, and retention of strong seedlings.†The diseased plants will be taken out of the field to reduce the spread of pathogenic bacteria. At the same time, the cultivating loose soil can increase the ground temperature by 1-3°C, promote the development of the root system of the cotton seedlings, make it grow robustly, and increase the disease resistance. The second is chemical control. If the incidence rate of the diseased land is more than 8%, it can be used to irrigate with 20% methyl-toxifoszate 1000-fold, 50% carbendazim 600-fold, 70% thiophanate-methyl 800-fold, and 32% cecrobacteria 1500-fold. Spray control. The third is spraying foliar fertilizer. When spraying with an agent, 80% of potassium dihydrogen phosphate can be added to promote weak seedlings and enhance resistance to stress.
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