The bean root rot generally has a severe onset in the hot season.
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Damage symptoms? The disease occurs in the roots and stems buried in the soil. The disease department was brown and dark brown in the beginning, irregular in shape, sometimes with red streak, and the lesion was slightly depressed, sometimes the surface of the plaque was cracked and penetrated into the cortex. Plants in the spring and summer flowering stages of the bean pods showed symptoms. The lower leaves were yellow, the edges were withered, and the diseased leaves spread from the bottom up and did not fall off. During the high temperature season of autumn beans, the seeds germinate and become infected. The radicles produce russet-like lesions that gradually turn dark brown. The young leaves of stems turn brown, atrophy and deformity, and the old leaves of the lower part of the stems are temporarily normal. The roots of the diseased roots were few and the plants were dwarfed. After the main roots were rotted or died, the upper stems and leaves were withered and the plants withered. The vascular bundles were red-brown. The difference from bean blight is that the diseased part is often confined to the root and the base of the rhizome. After the main root is rotted, it causes the symptoms of wilting in the shoot. Pathogen Bean Root Rot Caused by Fungal Fungi Subphylum Fusarium solani (Mart.) App. Et Wollenw. f. Sp. Phaseoli (Berkh.) Snyder and Hansen caused by infestation.
The characteristics of the disease? Mycelia are mainly mycelium and chlamydospore overwhelming on the soil sickness, followed by overwintering in manure, soil and barnyardgrass become important primary infestation of the disease, mainly through irrigation water, rain, Tools, fertilizers, etc., spread from the wound to invade the disease, and the conidiospores produced in the diseased part of the disease are spread by rain splashing or flowing water to carry out repetitive infestation and spreading the disease. High-temperature (29 ~ 32 °C) high-humidity environmental conditions are most likely to induce disease. Low-lying land, poor drainage, and soils with poor viscidity and poor hydrophobicity, especially in continuous cropping areas, are often severely affected. The pathogens live in the soil for many years with the diseased body or manure, and can be rotted for more than 10 years without the host. Seeds do not contain bacteria. The sick or fertilized manure in the field is the first source of infestation in the second year. It spreads through rainwater, irrigation water, and agricultural operations, and invades the skin from the host's underground wound. The occurrence of the disease was related to the resistance of the bacteria source and the kidney bean in the soil. Qiu Kang 6, Chun Feng 4, and Feng Shou 1 were more severe than those of the anti-Bo clay soil. Chilling injury, the application of decomposed manure, and wounds in the roots can cause hair loss. The Beijing-Tianjin region has a severe outbreak in the high-temperature season from June to August.
Control methods
1. Serious illness fields should be practiced with cabbage, onion and garlic for more than 2 years. It is best to implement a dry and dry rotation.
2. Seriously ill areas (50% carbendazim or 40% triadimefon carbendazim WP may be used as 1:500) soil for transplanting seedlings in nutrition cups, or soil protection seedlings for sowing (seedlings) , Or use 1 000 times the liquid agent or 1 000 times enemy liquid for rooting water. After the emergence to the early flowering stage, the above-mentioned agents are used 1,000 times, or 600 to 1000 times of potassium permanganate, or 20% of CK and 1200 times, and 50% of thiophanate-methyl WP. The liquid is poured at the base of the stem and applied once every 7-10 days for 2-3 consecutive times. Spraying and spraying combined, spraying 3 to 4 times.
Damage symptoms? The disease occurs in the roots and stems buried in the soil. The disease department was brown and dark brown in the beginning, irregular in shape, sometimes with red streak, and the lesion was slightly depressed, sometimes the surface of the plaque was cracked and penetrated into the cortex. Plants in the spring and summer flowering stages of the bean pods showed symptoms. The lower leaves were yellow, the edges were withered, and the diseased leaves spread from the bottom up and did not fall off. During the high temperature season of autumn beans, the seeds germinate and become infected. The radicles produce russet-like lesions that gradually turn dark brown. The young leaves of stems turn brown, atrophy and deformity, and the old leaves of the lower part of the stems are temporarily normal. The roots of the diseased roots were few and the plants were dwarfed. After the main roots were rotted or died, the upper stems and leaves were withered and the plants withered. The vascular bundles were red-brown. The difference from bean blight is that the diseased part is often confined to the root and the base of the rhizome. After the main root is rotted, it causes the symptoms of wilting in the shoot. Pathogen Bean Root Rot Caused by Fungal Fungi Subphylum Fusarium solani (Mart.) App. Et Wollenw. f. Sp. Phaseoli (Berkh.) Snyder and Hansen caused by infestation.
The characteristics of the disease? Mycelia are mainly mycelium and chlamydospore overwhelming on the soil sickness, followed by overwintering in manure, soil and barnyardgrass become important primary infestation of the disease, mainly through irrigation water, rain, Tools, fertilizers, etc., spread from the wound to invade the disease, and the conidiospores produced in the diseased part of the disease are spread by rain splashing or flowing water to carry out repetitive infestation and spreading the disease. High-temperature (29 ~ 32 °C) high-humidity environmental conditions are most likely to induce disease. Low-lying land, poor drainage, and soils with poor viscidity and poor hydrophobicity, especially in continuous cropping areas, are often severely affected. The pathogens live in the soil for many years with the diseased body or manure, and can be rotted for more than 10 years without the host. Seeds do not contain bacteria. The sick or fertilized manure in the field is the first source of infestation in the second year. It spreads through rainwater, irrigation water, and agricultural operations, and invades the skin from the host's underground wound. The occurrence of the disease was related to the resistance of the bacteria source and the kidney bean in the soil. Qiu Kang 6, Chun Feng 4, and Feng Shou 1 were more severe than those of the anti-Bo clay soil. Chilling injury, the application of decomposed manure, and wounds in the roots can cause hair loss. The Beijing-Tianjin region has a severe outbreak in the high-temperature season from June to August.
Control methods
1. Serious illness fields should be practiced with cabbage, onion and garlic for more than 2 years. It is best to implement a dry and dry rotation.
2. Seriously ill areas (50% carbendazim or 40% triadimefon carbendazim WP may be used as 1:500) soil for transplanting seedlings in nutrition cups, or soil protection seedlings for sowing (seedlings) , Or use 1 000 times the liquid agent or 1 000 times enemy liquid for rooting water. After the emergence to the early flowering stage, the above-mentioned agents are used 1,000 times, or 600 to 1000 times of potassium permanganate, or 20% of CK and 1200 times, and 50% of thiophanate-methyl WP. The liquid is poured at the base of the stem and applied once every 7-10 days for 2-3 consecutive times. Spraying and spraying combined, spraying 3 to 4 times.
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