Chrysanthemum pest and disease control methods are essential for maintaining healthy plants. One of the most common issues is gray mold, which can be managed by applying fungicides such as chlorhexidine diluted to 1500 times, mancozeb at 500 times, sylphyrin at 150 times, or chlorothalonil at 600 times. It's recommended to apply these treatments 2–3 times with a 7–10 day interval, and rotating between different fungicides helps prevent resistance.
Chalk disease typically affects the roots of chrysanthemums. To prevent it, ensure that the growing medium is clean and well-drained. Before planting, you can sterilize the substrate through exposure to sunlight or mixing with appropriate agents. During growth, you can treat the roots using a 500-times dilution of diclobutrazol or an 800-times dilution of pentachloronitrobenzene. Applying this treatment twice, spaced about 10 days apart, usually helps eliminate the problem effectively.
Stem rot often occurs in seedlings, causing the base of the stem to rot. The best way to manage this issue is to transplant affected seedlings promptly. For chemical control, you can use a 600-times dilution of antiviral cockroach or DuPont gram, both of which have shown good results in preventing further spread.
Common pests include aphids and spider mites. To control them, spray the plants with 1500-times diluted insecticides like imidacloprid or 3000-times diluted avermectin. Two applications, spaced 7–10 days apart, are usually sufficient to keep these pests under control. Regular monitoring and early intervention are key to maintaining a healthy chrysanthemum garden.
Rotary Rings are a type of rotating seal widely used in various rotating equipment, such as rotary joints, rotary couplings, rotary connectors, etc. Its main function is to prevent liquid or gas leakage and maintain the normal operation of the equipment. In different applications, the material, structure, sealing method, size, etc. of Rotary Rings vary to adapt to different working conditions.
The materials of Rotary Rings are mainly divided into two categories: metallic and non-metallic.
Metal materials mainly include stainless steel, steel, copper, aluminum, etc., which have characteristics of high strength, corrosion resistance, wear resistance, and are suitable for rotary seals in harsh environments such as high temperature, high pressure, and high-speed.
Non metallic materials mainly include ceramics, silicon carbide, graphite, etc., which have characteristics such as high hardness, high wear resistance, and low friction coefficient. They are suitable for rotary seals under conditions such as low temperature, low pressure, and high speed.
The structure of Rotary Rings is mainly divided into three types: unidirectional rotation, bidirectional rotation, and rotational stationary.
1. Unidirectional rotating structure
The Rotary Rings with a unidirectional rotation structure can only rotate in one direction and are suitable for devices with only unidirectional rotation.
The Rotary Rings with a bidirectional rotation structure can rotate in two directions, suitable for devices that require bidirectional rotation.
The Rotary Rings with a rotating stationary structure are composed of a rotating ring and a stationary ring. The rotating ring contacts the stationary ring during rotation to achieve sealing, suitable for equipment that requires a rotating stationary seal.
The sealing methods of Rotary Rings are mainly divided into mechanical sealing and liquid sealing.
Mechanical sealing is achieved through the contact surface between the rotating ring and the stationary ring, which has the characteristics of high reliability, long service life, and simple maintenance. It is suitable for rotary sealing in harsh environments such as high speed, high temperature, and high pressure.
Liquid sealing is achieved by injecting liquid between the rotating ring and the stationary ring, which has the characteristics of good sealing performance, low friction coefficient, and preventing dry friction. It is suitable for rotary sealing under low speed, low temperature, low pressure, and other conditions.
The size of Rotary Rings is mainly determined by the equipment requirements, including inner diameter, outer diameter, thickness, shaft diameter, etc.
Rotary Seals,Rotary Lip Seal,Rotating Shaft Seal,V Seals
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