In recent years, the development speed of alfalfa in China has been rapid and the area has doubled. Due to the improper prevention and control of diseases, the yield and quality have declined. After the infected alfalfa, the leaves appeared lesions and even fell off, the stems and leaves were yellow, the plants were wilting, the yield was decreased, and the useful life was shortened. The following describes the incidence of common diseases, so that the majority of farmers to develop reasonable preventive measures.
1, brown spot
Brown spot, also known as common leaf spot, is a common disease that can occur everywhere. The pathogen is pseudosphaeroides pseudoseptica. The lesions occur on the leaves. They are brown, nearly round, 0.5-2mm in diameter, and the edges are not neat. The leaves turn yellow when they develop, and when they are severe, they fall off in large quantities, causing a decline in yield. , The useful life is reduced.
2. Rust
Rust is a common disease, and it occurs everywhere. It is more severe in warm and humid areas. The pathogenic bacteria is the unicellular rust fungus of the genus Piromyces. The disease mainly damages the leaves, petioles, stems and pods of alfalfa. At the onset of the disease, small round, verrucous lesions appear under the leaves. The lesions appear gray-green at the beginning, and the epidermis ruptures as a powder.
3, downy mildew
Downy mildew occurs mostly in temperate regions and occurs more severely in the cold and wet areas. The pathogen was Bacillus subtilis. After the onset of the disease, the leaves of the affected strains showed irregular patches of greenish green. The first layer of gray and mildew appeared on the lesions and the last appeared lavender.
4, powdery mildew
The disease is caused by the powdery mildew, Neisseria sclerotiorum, and occurs severely in dry irrigated areas. When the leaves, petioles, stems or pods of the plants are infested, white patches of mildew appear.
5, anthrax
Anthracnose is caused by anthrax spp. Anthracnose, which occurs in warm southern areas. The stems, leaves, pods, etc. of the plant can be infested. The lesions are yellow-brown at the beginning and brown afterwards. The stems and leaves are dead when severe.
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