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Therefore, it is important to guarantee a successful soybean crop every growing season. Bacterial blight can be found in most soybean fields every year in the Midwest. [2] Yield losses due to Pseudomonas syringae pv. glycinea have been reported as anywhere from 4% to 40% depending on the severity of the conditions. [1]
Bacterial diseases; Bacterial blight Pseudomonas amygdali pv. glycinea: Bacterial pustules Xanthomonas axonopodis pv. glycines = Xanthomonas campestris pv. glycines: Bacterial tan spot Curtobacterium flaccumfaciens pv. flaccumfaciens = Corynebacterium flaccumfaciens pv. flaccumfaciens: Bacterial wilt Curtobacterium flaccumfaciens pv. flaccumfaciens
Cercospora sojina is a fungal plant pathogen which causes frogeye leaf spot of soybeans. Frog eye leaf spot is a major disease on soybeans in the southern U.S. and has recently started to expand into the northern U.S. where soybeans are grown.
Diseases caused by P. syringae tend to be favoured by wet, cool conditions—optimum temperatures for disease tend to be around 12–25 °C (54–77 °F), although this can vary according to the pathovar involved. The bacteria tend to be seed-borne, and are dispersed between plants by rain splash.
Halo blight of bean is a bacterial disease caused by Pseudomonas syringae pv. phaseolicola. Halo blight’s pathogen is a gram-negative, aerobic, polar-flagellated and non-spore forming bacteria. This bacterial disease was first discovered in the early 1920s, and rapidly became the major disease of beans throughout the world.
The disease reaches its climax when the crop begins flowering. The cycle of the pathogen continues until the crop is defoliated or until the environment becomes unfavorable to the pathogen. [8] The Asian soybean rust is a polycyclic disease: within the disease cycle, the asexual urediniospores keep infecting the same plant.
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Phytophthora sojae is an oomycete and a soil-borne plant pathogen that causes stem and root rot of soybean. This is a prevalent disease in most soybean growing regions, and a major cause of crop loss. [1] In wet conditions the pathogen produces zoospores that move in water and are attracted to soybean roots. Zoospores can attach to roots ...