Compared with conventional cotton, currently widely used insect-resistant cotton varieties in the middle and late stages show the characteristics of rapid transformation in budding stage, fast bolls, premature aging, and sensitivity to plant growth regulators, such as dildoamine. The resistance of the fourth-generation H. armigera was also reduced. Therefore, the mid and late management of insect-resistant cotton should pay attention to the following points: Early application and reuse of flower bell fertilizer. In response to the characteristics of the “two fasts†of insect-resistant cotton (faster conversion during budding period and faster speed of ringing), the management of fertilizer and water is earlier than that of conventional cotton in order to adapt to the characteristics of the concentration of the bells and the requirement for late prevention of premature death, especially for re-application. Early flowering fertilizer, the amount of fertilization depends on base fertilizer and cotton growth flexibility, generally 15 to 20 kg of urea topdressing urea, the base fertilizer is not applied on the plot of potassium fertilizer should also be applied potassium sulfate or potassium chloride 10 to 15 kg. In addition, according to the growth of cotton in mid-July (full flowering period), 10 kilograms of urea are topdressed and watered in case of drought. 2. Chemical regulation. Insect-resistant cotton is more sensitive to dilute amines, so the chemical regulation should be based on the situation of cotton growth and rainfall, and be flexible in light of the principle of a few times. On the basis of chemical regulation in the middle and early stages, the chemical regulation is generally performed after the initial flowering period. 2 to 3 times. In the first flowering period, 1.5-2.5 g of diaminos per acre are used for foliar spraying of 30-40 kg of water. If there is more rain, the cotton will grow more prosperous and can be sprayed once every 15 to 20 days; The use of dildo-3 to 4 grams per acre, the water 30 to 40 kilograms of foliar spray, spray 6 hours after the rain should be reduced spray. 3. Timely topping. In accordance with the principle of "When it's time to wait for branches and branches to unequal hours", it usually ends at about the time of July 20 or when the number of single fruit branches reaches 15. 4. Pest control. At present, the insect-resistant cotton has no resistance to cotton aphid, cotton leafhopper and other pests, and the resistance level to cotton bollworm also decreased in the middle and later stages. Therefore, in the middle and late stages, combined prevention and treatment of Fuxi and cotton leafhoppers should be used for the concurrent treatment of cotton bollworm. In the prevention and treatment of Fuxi, the treatment of cotton leafhoppers and cotton bollworm, can be used 10% of imidacloprid 1000 times and 20% of the speed of killing 10000 times and 5% of Bai Shude 1000 times mixed spray control; In order to prevent and treat mainly cotton leafhoppers, and to treat both fleas and cotton bollworms, they can be sprayed with a mixture of 20% hydrazine 1000 times and 40% monocrotophos or 50% phoxim 1000 times. If the 3rd and 4th generations of the cotton bollworm have a large amount, the main prevention and control of cotton bollworm should be based on the combination of fleas and cotton leafhoppers. It is possible to use 50% of cyanobacteria to obtain 800 times solution and 40% of monocrotophos 1000 solution times. Or use 2.5% kungfu chrysanthemum 1000 times mixed with 50% phoxim 1000 times spray control. The above-mentioned method can achieve the purpose of applying a few insects and treating them at one time, save cost, and has good effect. ?
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