First, the red spot disease
Symptoms: Occurred mainly on the leaves, the lesions were polygonal, yellow-brown to dark reddish-brown, and dark brown spots were later developed. In severe cases, the leaves are covered with lesions, often connected into pieces, causing the leaves to fall off.
Incidence pattern: It is a fungal disease. The pathogens are Cercospora and Crude Caudal. The disease usually occurs from July to September. Mostly from the lower leaves of the first disease, gradually spread upward to expand. Poor growth of plants, heavy onset in rainy seasons, pathogens overwinter on diseased leaves and debris.
Prevention and control method: autumn clear disease leaves, concentrated burning, reduce the source of infection. At the time of onset, 50% Carbendazim WP can be sprayed 700 to 1000 times, or 70% Mancozeb WP can be 800 to 1000 times, or 80% Zn-Zn 500 times. Spraying 10 times a day, even spraying 3 to 4 times have a better control effect.
Second, Bauhinia blight
Symptoms: The leaves begin to appear yellow and fall off from the top of the diseased branches. The disease generally begins with individual branches and gradually develops until the whole plexus dies. After peeling off the bark, yellow-brown longitudinal stripes were seen in the xylem, and yellow-brown ring-shaped necrotic spots were seen on the cross section.
Incidence of the law: the disease from the underground wound into the roots of plants, damage the vascular tissue of the plant, causing the plant withered to death. The disease is caused by the infection of Fusarium in the fungus. The bacteria can survive in the soil or on the residue of the diseased plants and have a longer survival time. It spreads mainly through soil, underground pests, and irrigation water. The incidence is usually heavier from June to July.
Control methods: Strengthen conservation management, increase tree vigor, and increase plant disease resistance. Nursery pay attention to crop rotation, avoid continuous cropping, or apply 70% pentachloronitrobenzene powder 3 to 5 kg/mu before sowing. The diseased branches and diseased plants that had died of were cut off in time and burned in a concentrated manner, and were disinfected with 70% pentachloronitrobenzene or 3% ferrous sulfate. You can use 50% of methionine WP 200 times or 50% of carbendazim WP 400 times, or use 100mL of antimycotic 120 agent to irrigate roots.
Third, the purple leaf blight
Symptoms: mainly harm the leaves. The lesions were reddish-brown in shape, mostly on the edges of the leaves. They were contiguous and expanded into irregular large spots, and most of the leaves were reddish brown withered. The late disease department produces black dots.
Incidence pattern: it is a fungal disease. The pathogenic bacteria overwinter on the diseased leaf with mycelia or conidia. Bauhinia plants are dense and susceptible to the disease. It usually begins in June.
Control methods: In the autumn, the diseased leaves were removed and burned. After spraying, spray 50% carbendazim 800 to 1000 times, or 50% thiophanate 500 to 1000 times, spray 10 to 15 days, spray 2 to 3 times.
Roundness Measuring Instruments
Roundness meter is a length measuring tool for measuring roundness using the rotary axis method. The roundness meter is a measuring tool for measuring the roundness error of the workpiece using the rotary axis method. Roundness tester is divided into two types: sensor rotary type and workbench rotary type. During measurement, the measured part is installed concentrically with the precision shaft system, and the precision shaft is attached with an inductive length sensor or a workbench for precise circular motion. It is composed of sensor, amplifier, filter and output device of the instrument. If the instrument is equipped with a computer, the computer is also included in the system.Roundness Tester
The principle of the roundness meter is the same as that of the coordinate measuring machine. In fact, its working principle is very simple. The coordinate measuring machine is a point acquisition tool. Its principle is to collect points first, and then form a line from points, and then form a three-dimensional model from lines. CMM is a kind of measuring equipment that has a guiding mechanism, a length measuring element, a digital display device in three mutually perpendicular directions, and a worktable that can place the workpiece (not necessarily large or huge). The measuring head can be moved to the measured point easily by manual or motorized means, and the coordinate value of the measured point is displayed by the reading device and the digital display device. Obviously, this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate value of any point in the measured volume can be displayed through the reading device and digital display device.
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