Symptoms mainly affect stems, leaf sheaths, and also leaf and panicles. The diseased department produces a long oval and rust-colored summer spores heap, which firstly occurs on the back of the leaves and is scattered. When the disease is severe, it grows into a bar shape. A large amount of rust-brown powder (Sporaria spp.) was released during ripening. In the late stages of growth, a black phospores heap forms.
The pathogen Puccinia graminis var. secalis Eriks et Henn. said that the rust variety of the rust of Puccinia was a basidiomycotina fungus. For morphological characteristics, see wheat stem rust. Transmission routes and disease conditions The bacterium produces uredia spores and teliospores on plants such as rye, barley, and wheatgrass, and produces rust spores and sexual spores on O. japonica and Mahonia plants. However, in the south, the pathogenic bacteria wintered on wheat seedlings in the summer and was damaged by wind and rain in the spring. The suitable temperature for onset is 18-25°C, and the incubation period is 7-14 days. Heavy rainfall, moist foliage, and excessive nitrogen application are beneficial to disease.
Control methods (1) Selection of resistant rye varieties. (2) Chemical control See Wheat stem rust.
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