Pea brown spot

Symptoms mainly harm the leaves, stems and pods. Leaf lesions produced round hazel to dark brown lesions, and lesions were prominent at the edges. Spotted small black spots on the spot, conidia. Stem disease spots brown to dark brown, spindle-shaped or oval-shaped, slightly concave, inward spread spread to the seeds, causing seed bacteria; seed lesions are not obvious, when the humidity is dirty yellow or grayish brown. China's brown spot disease is a common disease, production of black spot, base rot, brown spot often mixed.

The pathogenic Ascochyta pisi Libert synonymous Diplodia macrophomoides Camara called the pea shell bisporus, a fungus belonging to the subphylum Fungi. The conidia of the pathogen are dark brown, spherical or oblate spheroids, 100-180100-120 (μm) in size, the wall of the device is membranous, the orifice is round, and conidiospores are released when mature. Conidia are suborbicular, twin, uncolored, 10-143-5 (μm) in size, with an oil point in each cell. Germ development temperature 15-26 °C, the highest 33 °C, the lowest 8 °C. In addition to harming peas, it also infects broad beans and kidney beans.

The route of transmission and the onset of disease occur with the conidia or mycelia attached to the seed or overwintering with the diseased body in the field. Sprouting the seed with the bacteria, the seedlings that are infected, disease and conidiospore on the cotyledon or young stem, the output of conidia spread through rain, re-infection, the incubation period of 6-8 days. 15-20°C in the field and wet and wet.

Control methods (1) Two to three years of rotation for severe disease fields and non-legume vegetables. (2) Select to leave disease-free seeds, or pre-soak the seed in cold water for 4-5 hours, place it in warm water at 50°C for 5 minutes, and then move it into cold water to cool and dry. (3) Select the Gaoshao plots, make them densely planted, adopt formula fertilization techniques, and increase the resistance to disease. (4) After the harvest, we should clean the garden in time and perform deep turning to reduce the source of overwintering bacteria. (5) Spray 50% benomyl WP 1500 times or 40% polysulfide suspension 800 times, 70% thiophanate-methyl WP 500 times, 30% Green Leaf Dan WP 500 - 800 times liquid, 80% spray grams of wettable powder 600 times, 75% chlorothalonil wettable powder 600 times, every 7-10 days to prevent 1 time, continuous control 2-3 times.

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