Cotton cancer treatment
Blight and verticillium wilt are referred to by cotton farmers as "cotton cancer." At present, the high temperature and heavy rain that lasted for several days made the surface of the cotton field appear to be “a very good situationâ€. However, when the author investigated the field, there were still stubble and verticillium wilt strains in the cotton fields, and the lower leaves were dry and extended inwards. Greenish yellow, poor growth of the whole plant, relatively short. Special reminder cotton farmers must not take it lightly. First, the characteristics of the disease. Blight and Verticillium wilt are mainly caused by bacteria in the soil (Fusarium can survive in the soil for 7 to 10 years, Verticillium wilt can survive in the soil for 6 to 8 years), diseased plant leaves and leaves with bacteria, seed bacteria and other factors. Incidence, long-term continuous cropping, extensive management, soil acidity, soil alkalinity, low soil organic matter content, soil viscous weight, potassium deficiency and other factors are serious. Some plots often occur in a mixture of two diseases. There is a close relationship between onset and temperature and humidity: Fusarium wilt usually begins at ground temperature of 20°C, ground temperature at 25 to 30°C is the peak of the disease, and stops at 32°C or above. Verticillium wilt also begins to occur after the budding period of cotton. The peak incidence is 25 to 28°C. The incidence below 25°C and above 30°C is slow, and development stops above 35°C. Second, chemical control. For the control of cotton withered and verticillium wilt, the strong resistance of the varieties is the basic factor, but the control of the pesticide is still an essential key measure. The author according to sterilization, regulation, nutrition "triple play" the idea, summed up a few pesticide formulations, the formula is the amount of commonly used manual sprayer per barrel: 114% dead rot 20 grams +36% cotton withered net (trichloroisocyanurate Acid, careful not to mix with organophosphorus pesticides) 15g + e-lead (lettatin and nutrient preparations) 40g + fulvic acid 50g. 280% Ethic Acid Allicin 16g + 50% Carbendazim 30g + Sulphuric Acid 1g + 50g more (rare earth type multi-element preparation). 314% of dead rot Kang 30 grams + 80% of Biciligin 8 grams + E lead 40 grams + 35% rich potassium type Fu Feng Su 25 grams. Third, pay attention to matters. 1 According to the weather forecast, spray “prevention medicine†in time before each rain (or before watering), and spray again 1 or 2 times after rain (or after watering) to control the spread of germs. 2 At the same time when spraying, irrigating roots of seriously ill strains and surrounding cotton plants, the effect is significantly better than pure spray. 3 The above formulas should be used alternately. Unilateral continuous application should not exceed 2 times.
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