The major pests and diseases of cotton buds include cotton bollworm, blind beak, red spider, and cotton wilt.
Prevention of cotton bollworm
Since the introduction of insect-resistant cotton, the use of herbicides has basically controlled the damage of the second-generation H. armigera; however, the insect-resistant cotton-bearing insecticides have a certain extent. For example, in 2010, when it was a “cold spring†year, the occurrence of the second generation of the cotton bollworm was heavier, and when the cotton was late in the year, it was more conducive to the spawning of the third generation of bollworm. Therefore, comprehensive prevention and control measures were adopted to achieve prevention and control. The control effect. 1. Agricultural control measures: Combine cotton repair to artificially kill the eggs on the cotton plant, and take the branches and leaves that have been taken out of the field and destroy them. 2. Physical control: Using poplar twigs to trap moths and corn traps to trap bollworm adults, effectively delaying and reducing the number of medications in cotton fields.
Prevention and control of red spider
Red spiders clustered on the back of the leaves to suck juice. After the cotton leaves were damaged, they lost their green color, yellow and white spots appeared on the leaves, and then they showed erythema. The erythema expanded and burned. 1. The control index of spider mites: The bud rate of cotton buds at the bud stage is 5% to 14% or 100 plant pods are more than 200. 2. Control medications: Abamectin + Pyrolene has a good control effect, and several newly-produced and listed drugs include: "wide-spectrum pesticides" and "Abigao Total Control", with both the killing and the bollworm killing. Insects also kill eggs and have a long duration of efficacy. The efficacy period is 30 days and the focus is on the back of the leaf.
Prevention and control of the second generation of blind ticks
According to the survey, the incidence of blind pupa in cotton buds is more common. In general, the number of damaged plants in cotton fields is 15% to 20%, serious land mass is more than 30%, and production is severely reduced. It is necessary to seize the key period and use drugs promptly to cure the disease before breaking the leaves. Control medication: 3% acetamiprid 3000 times or 4.5% beta-cypermethrin EC 1000 times +10% imidacloprid 2000 times, spray sooner or later.
Bud blight control
Fusarium wilt begins to develop at the seedling stage of cotton and enters the peak of incidence before and after budding. After the disease, the cotton leaves curl, chlorosis, and vascular bundle damage become brown, affecting the water transport, resulting in a large number of dead seedlings, resulting in reduced cotton yield and reduced quality. The soil and seeds are the main carriers, so the prevention and treatment of seeds before sowing are the key measures. Spotted sporadic strains in the field at the seedling stage should be immediately unplugged and burned. Onset of heavier plots can be used to net 30 grams of cotton withered, 45 kilograms of water, or 80% of allicin, 12.5% ​​of the effective treatment of Weiling and other agents + potassium dihydrogen phosphate, "green wind 95" and other foliar fertilizer Using the method of spraying and irrigating the roots, 50 to 100 ml of liquid per strain is applied, and the drug is administered once every 5 days for 2 to 3 consecutive applications. Non-invasive plots should be sprayed with fulvic acid organic fertilizer or potassium dihydrogen phosphate, green wind 95, once every 7 days, and even spray 2 or 3 times.
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