Vegetables in the process of growth will have a variety of diseases, so long we need to choose vegetable fungicides to treat these viral diseases one by one:
However, it should be pointed out that the action of this kind of fungicide is relatively simple. Once the action site changes, it will inevitably lead to the resistance of the pathogen. For a long time, cases of drug efficacy reduction due to drug resistance have been common. Production practice shows that In some traditional vegetable producing areas, the resistance of pathogenic bacteria is strong, the use ratio of fungicides is decreasing day by day (currently dropped to 200-300 times), not only the cost of prevention is greatly improved, but also the control effect is 70%-80 in the initial stage. % dropped to the current 30%-40%. Therefore, many experts suggest that while comprehensive prevention and control work should be done comprehensively, it is necessary to scientifically select new pesticides and use them alternately during prevention and treatment.
A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by José Antonio de Alzate y RamÃrez, a Mexican priest and scientist, who described the device in 1790 in the Gaceta de Literatura Méxicana.[1] It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The float is often ball-shaped, hence the name ballcock. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level rises, the float rises with it; once it rises to a pre-set level, the mechanism forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.
Ball Cock, Brass Ball Bibcock, Ballcock Valve, Toilet Ballcock Valve
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