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Septoria glycines is a fungal plant pathogen that causes leaf spot on soybean, a disease that is also known as brown spot. [1] The disease leads to early defoliation of the plant, but does not normally cause severe reductions in yield. The fungus overwinters on infected soybean straw and is spread by wind dispersal or rain splash. [2]
Pseudomonas syringae pv. glycinea attacks all of the above-ground parts of soybean, but symptoms are typically seen on the mid-upper canopy of leaves and pods. [5] After infection, small, water-soaked spots surrounded by a chlorotic halo appear on the leaves. The brown or black centers of these spots indicate that the tissue is dying.
Causes Phyllosticta Leaf Spot on soybeans. Forms circular lesions with reddish-brown borders and light brown center. The center of the lesion will drop out over time. Visible pycnidia can be seen in older lesions. [1] A common consequence of infection is reduced yield from the damaged leaves.
Brown spot Septoria glycines Mycosphaerella usoenskajae [teleomorph] Brown stem rot Phialophora gregata = Cephalosporium gregatum. Charcoal rot [1] Macrophomina phaseolina. Choanephora leaf blight Choanephora infundibulifera Choanephora trispora. Damping-off Rhizoctonia solani Thanatephorus cucumeris [teleomorph] Pythium aphanidermatum Pythium ...
Diaporthe phaseolorum var. sojae is the perfect form of the causal pathogen of pod and stem blight of soybean. [2] It is a fungal ascomycete that commonly infects seeds, pods, stems, and petioles. This pathogen is also found in its imperfect state, Phomopsis sojae. This is a common disease of most soybean growing regions in the United States ...
These spots may be better observed using assistance of a light source. As the disease progresses, lesions start to form on the leaves, stems, pod, and petioles. Lesions are initially small, turning from gray to tan or brown as they increase in size and the disease gets more severe. Soon volcano-shaped marks are noticed in the lesions. [6]
Linoleic acid, an omega-6 fatty acid that is found in corn, peanut, soybean, safflower and sunflower oils, is the most common omega-6 in the US food supply.
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. The disease is also found in other soybean production areas of the world.