Symptoms mainly affect leaves, stems and tubers. Leaf disease was firstly attacked on the old leaves on the ground, and the diseased part showed irregular dark brown spots and rotted when the humidity was high. Stem disease mostly begins with the wound, and then spreads to the stem. The medulla rots in the later stem and is odorous. The upper stem of the diseased stem is wilting and the leaves turn yellow. Tuber disease caused by cortical wounds was mostly submerged in water. After the tuber tissue disintegrated, it gave off odor.
There are three kinds of pathogens. Erwinia carovora subsp. carotovora (Jones) Bergey et a1. Carrot-infested Erwinia carotovora and soft-rot diseased species and E, caritivira sybso. atroseptica (Van Hall) Dye said Erwinia carotovora and potato subspecies. E. chrysanthemi Burkh Burkholder, McFadden et Dimock said E. chrysanthemi. Bacteria straight rod-shaped, size 1-30.5-1 (μm), solitary, sometimes opposite, Gram-negative, relying on flagellar movement, and anaerobic.
Transmission routes and pathogenic conditions Pathogens inflict overwintering on the sick or in the soil, invade through wounds or natural rips, and spread by rain splashes or insects.
Control methods (1) Strengthen field management, pay attention to ventilation and light and reduce the humidity in the field. (2) Remove diseased plants in time and disinfect with lime to reduce primary infections and re-infestation sources in the field. (3) Avoid flood irrigation. (4) Spray 50% Chlortothasone WP 500 times or 12% Green Milk Emulsion 600 times, 47% Garethon WP 500 times, and 14% Bromine Hydrochloride 300 times.
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