Sclerotinia sclerotiorum is a new disease in onion seedlings in recent years, and the damage is very serious. The onset of seedling stage begins at the base of the stem, and the diseased part is brown water-stained at the beginning. When the humidity is high, the white cotton-like hyphae grows, which is soft and rot-like, has no odor, is grayish white after drying, and the mycelium is sclerotia. The diseased department overflowed and the seedlings died.
Sclerotinia sclerotiorum mainly overwinters in the field or plastic shed soil with sclerotia. When the ambient temperature and humidity are suitable, the sclerotia germinates, and the germs pass to the host with the airflow, and invade from the wound and the natural hole. The suitable conditions for the germination of the pathogen are 16-20 Â° C, and the relative humidity of the air is 95% to 100%. When the temperature is low and the humidity is high, the disease is serious.
Characteristics of 3003 aluminium sheet:
3003 is an AL-Mn alloy, which is widely used as a kind of rust-proof aluminium. Its strength is not high (slightly higher than that of industrial pure aluminium) and can not be strengthened by heat treatment. Therefore, cold working method is adopted to improve its mechanical properties: high plasticity in annealing state, good plasticity in Semi-cold hardening, low plasticity in cold hardening and corrosion resistance. Good corrosion, good weldability and poor machinability. It is mainly used for low-load parts which require high plasticity and good weldability and work in liquid or gas media, such as mailbox, gasoline or lubricant conduit, various liquid containers and other low-load parts made by deep drawing: wire rods are used as rivets.
The main alloy element of 5052 is magnesium, which has good formability, corrosion resistance, weldability and medium strength. It is used to manufacture aircraft fuel tank, fuel pipe, sheet metal parts of traffic vehicles and ships, instruments, street lamp brackets and rivets, hardware products, electrical-appliance shell, etc. (2) Al-Mn alloy is a kind of rust-proof aluminium widely used. It has high strength, especially fatigue strength: high plasticity and corrosion resistance, can not be strengthened by heat treatment, good plasticity in Semi-cold hardening, low plasticity in cold hardening, good corrosion resistance, good weldability, poor machinability and polishing. Uses are mainly used for low-load parts which require high plasticity and good weldability and work in liquid or gas media, such as oil tank, gasoline or lubricating oil conduit, various liquid containers and other small-load parts made by deep drawing: wire rods are used as rivets.
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