by Cooperative Extension Service, College of Agriculture, Washington State University in Pullman .
Written in English
|Statement||[Otis C. Maloy and D.W. Burke].|
|Series||Plant diseases, Extension mimeo -- 3424., Extension mimeo (Washington State University. Cooperative Extension) -- 3424.|
|The Physical Object|
• Initial root rot symptoms appear as elongated, water-soaked necrotic areas on roots or hypocotyls, sometimes extending above soil line • Wilting and death of plants (damping off) • Symptoms on above-ground tissues (blight phase) may occur after extended conditions of . Symptoms of Bean Root Diseases. The most common signs of root rot are subtle and hard to discern at first. Bean plants may be stunted and turn yellow, exhibiting signs of malnourishment. Symptoms of root rot in bean plants can start at emergence or even in mature plants. The dry bean varieties are more commonly affected than snap beans. Root Rot Management. Crop rotation: Longer rotations may help reduce inoculum. If Rhizoctonia is present, avoid sugarbeet and soybean in close rotation. Root rot is less severe following wheat. Seed: Plant high-quality seed. Seed treatments: Most dry bean seed comes with a fungicidal seed treatment, which will aid in disease management. PYTHIUM DISEASES. Several species of Pythium cause seed rots, pre- and post-emergence damping-off, stem and root rots, and even some pod rots. Losses can be as high as % when the disease is severe. 2 Infections of root systems cause slightly sunken, tan lesions that coalesce. Both primary and secondary roots are affected, resulting in a wet, soft rot of large portions of the root system.
The bean root is a bridge between the plant above the ground and the soil below. In addition to providing the plant with water and soil nutrients, bean roots anchor the plants and fix nitrogen from the soil. Some bean roots are even edible. You should be alert for bean root diseases and insect attacks that may affect the health of the entire plant. Root rot can be caused by a variety of different fungi, and it can affect trees, shrubs, and plants. Typically, one of the main triggers is over-watering, leading to too much moisture around the roots of the plant. This creates an ideal Views: 23K. Root rot diseases cause noticeable yield losses in common or dry bean, which is an important food crop worldwide. Cultivation of this legume crop assists with developing organic agriculture by fixing nitrogen, which is strongly restricted in rotted roots. Fusarium root rot is most commonly encountered during mid to late season in fields with a long history of bean production. The disease causes little damage to unstressed plants, but under conditions of drought, poor nutrition, or oxygen-stressed, waterlogged soil, Fusarium solani can be one of the causes of early maturity ("cut out") and marked reduction in yield.
Bean seeds may rot if they're planted too deeply, especially in =spring, when the soil is cold and wet. Plant bean seeds in the spring no deeper than 1 inch to ensure they germinate quickly. Root rot of pea and fava bean in Southern Sweden were found to be caused by P. pisi sp. nov. . The P. citricola complex has been found associated with mortality of Aucuba japonica in the UK . P. palmivora is a common causal agent in papaya root rot . Phytophthora root rot is . Foot, stem and root rots. These can occur on seedlings and on more mature plants, causing browning of the stem base and wilting of the leaves. Foot and root rots in beans appear to be more sporadic than those which occur in peas, and the bean crop in general appears less sensitive to root rots than peas. Root rot is becoming visually evident in many edible bean fields now that beans are entering a more rapid vegetative growth phase and will have a high demand for water and nutrients. Pounding rains, compaction, tillage pans, poor internal drainage and soil structure are common culprits for inducing root rot.