Bacterial disease of bean is also known as leaf burn disease, which is heavier than summer bean damage.
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Symptoms: The main damage leaves, but also harm stems and fruits. Leaf blade victim, starting from the tip and edge of the leaf, at the beginning, it is a dark green water spotted small spot. With the development of the disease, the lesion expands into an irregularly shaped brown necrotic spot. There is a yellow halo around the lesion. The diseased part becomes hard and thin. Transparent, brittle. Dry leaves like fire, it is also known as leaf burning. Young leaves suffer damage, shrinkage, deformation, easy to fall off. The stalks became infected with water-stained, brownish-striped spots, and they died after they surrounded the stems for one week. The fruit was infected with a brownish-red, slightly sunken, near-circular spot. In severe cases, yellow-brown sagging lesions also appeared in the seeds of the soybean meal. Under wet conditions, yellow fungal pus overflowed from leaves, stems, diseased parts, and seed umbilicus.
?? Pathogen? Xanthomonas campestris pv. phaseoli Dye said wild rape yellow cells, bacteria. The fungus is short-barbed and produces 1 flagellum. The germs develop well at a temperature of 30°C and die at 50°C for 10 minutes.
?? The characteristics of the disease? The pathogen in the seed coat or seed winter. Seed germs can survive 2 to 3 years. Bacteria attached to the diseased body lose their pathogenicity as the diseased body rots. The seed with bacteria causes the onset of seedlings and produces pyothelium at the growing point and the diseased part of the cotyledon. Wind, rain, and agricultural activities are all media. Pathogens invade through wounds, orifices (water holes, stomata). High temperature, high humidity, heavy fog, and condensation are favorable for hair growth. Summer and autumn air sultry, continuous rain, rain and other rapid development of the disease. Extensive management, partial application of nitrogen fertilizer, flood irrigation, weeds, serious pests, etc., are favorable for hair?
?? Prevention methods
? 1, agricultural control. Three-year rotation is adopted; disease-free fields are planted, and disease-free seeds are selected; soaked in warm water at 55°C for 10 minutes; do not apply large water to warm water; apply rotting fertilizer to remove diseased bodies. Applying basal fertilizer, increasing phosphorus and potash fertilizers, finely leveling the land, preventing local accumulation of water, removing diseased leaves at the early stage of disease, breaking away from the old leaves, and enhancing field permeability. ?
??2, chemical control. At the beginning of onset, use 14% urinary copper wettable powder 300 times, 50% guava copper DT wettable powder 500 times, 77% WP 500 times, or 72% agricultural streptococci 4000 times liquid, neophytin 4000 times, 47% Garnett WP 1000 times, sprayed every 7-10 times, continuous control 2-3 times. The above agents can be used in turn. Commonly used pharmaceuticals: Alanine copper, copper citrate ferric acid (DT), can be killed, Thiobacillus copper, neomycin, Garrinone and other agents.
Symptoms: The main damage leaves, but also harm stems and fruits. Leaf blade victim, starting from the tip and edge of the leaf, at the beginning, it is a dark green water spotted small spot. With the development of the disease, the lesion expands into an irregularly shaped brown necrotic spot. There is a yellow halo around the lesion. The diseased part becomes hard and thin. Transparent, brittle. Dry leaves like fire, it is also known as leaf burning. Young leaves suffer damage, shrinkage, deformation, easy to fall off. The stalks became infected with water-stained, brownish-striped spots, and they died after they surrounded the stems for one week. The fruit was infected with a brownish-red, slightly sunken, near-circular spot. In severe cases, yellow-brown sagging lesions also appeared in the seeds of the soybean meal. Under wet conditions, yellow fungal pus overflowed from leaves, stems, diseased parts, and seed umbilicus.
?? Pathogen? Xanthomonas campestris pv. phaseoli Dye said wild rape yellow cells, bacteria. The fungus is short-barbed and produces 1 flagellum. The germs develop well at a temperature of 30°C and die at 50°C for 10 minutes.
?? The characteristics of the disease? The pathogen in the seed coat or seed winter. Seed germs can survive 2 to 3 years. Bacteria attached to the diseased body lose their pathogenicity as the diseased body rots. The seed with bacteria causes the onset of seedlings and produces pyothelium at the growing point and the diseased part of the cotyledon. Wind, rain, and agricultural activities are all media. Pathogens invade through wounds, orifices (water holes, stomata). High temperature, high humidity, heavy fog, and condensation are favorable for hair growth. Summer and autumn air sultry, continuous rain, rain and other rapid development of the disease. Extensive management, partial application of nitrogen fertilizer, flood irrigation, weeds, serious pests, etc., are favorable for hair?
?? Prevention methods
? 1, agricultural control. Three-year rotation is adopted; disease-free fields are planted, and disease-free seeds are selected; soaked in warm water at 55°C for 10 minutes; do not apply large water to warm water; apply rotting fertilizer to remove diseased bodies. Applying basal fertilizer, increasing phosphorus and potash fertilizers, finely leveling the land, preventing local accumulation of water, removing diseased leaves at the early stage of disease, breaking away from the old leaves, and enhancing field permeability. ?
??2, chemical control. At the beginning of onset, use 14% urinary copper wettable powder 300 times, 50% guava copper DT wettable powder 500 times, 77% WP 500 times, or 72% agricultural streptococci 4000 times liquid, neophytin 4000 times, 47% Garnett WP 1000 times, sprayed every 7-10 times, continuous control 2-3 times. The above agents can be used in turn. Commonly used pharmaceuticals: Alanine copper, copper citrate ferric acid (DT), can be killed, Thiobacillus copper, neomycin, Garrinone and other agents.
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