Rust generally only causes local infection, and the affected parts may produce vesicular spots or vesicular, cup-shaped, hairy objects of different colors due to the accumulation of spores. Some may also cause tumors, rough skin, clumps, twigs and other symptoms on the branches, or cause fallen leaves, scorched shoots, poor growth, etc. In severe cases, the spores are densely packed into pieces, and the plant withers rapidly due to the evaporation of a large amount of water in the body.
Rust usually overwinters with winter spores. The first source of infection is basidiospores or uredospores, and then the rust spores or uredospores continue to cause damage by air flow during crop growth.
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