| Cochliobolus victoriae | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Dothideomycetes |
| Order: | Pleosporales |
| Family: | Pleosporaceae |
| Genus: | Cochliobolus |
| Species: | C. victoriae |
| Binomial name | |
| Cochliobolus victoriae R.R. Nelson, (1960) | |
| Synonyms | |
Bipolaris victoriae(F. Meehan & H.C. Murphy) Shoemaker, (1959) Contents | |
Cochliobolus victoriae is a fungal plant pathogen. It caused the disease called "victoria blight" affecting oats and similar grains.
Cochliobolus victoriae is a fungus that causes Victoria blight in oats. Symptoms include stem weakening, seedling death, leaf damage, and premature ripening of seeds. [1] Other symptoms include basal necrosis and foliar striping, which begins at the lower leaves and proceeds upwards. Blackened nodes and root rot can also be symptoms. [2] Conidiophores emerge from the stomata or epidermal cells of the diseased oat, usually in groups of two to five, and are a medium-brown color. [2]
Victorian oat varieties have resistance to crown rust, which is considered one of the most important diseases in oats. In the 1940s, Victoria oats were very popular among American oat farmers because of this crown rust resistance. However, the same gene that grants crown rust resistance is also responsible for causing susceptibility to Victoria blight. Victoria blight was first reported in America in 1946. Victoria blight caused huge losses to oat yields, and in 1947 and 1948 it reached epidemic proportions in oat growing regions of America. These huge epidemics caused Victoria oat cultivars to be abandoned by growers [3] Other varieties of oats are not susceptible to Victoria blight, so by switching to these other varieties, further outbreaks of Victoria blight have been prevented. However, this means that growers are unable to take advantage of the crown rust resistance that Victoria oats have. [4] Thus, crown rust remains a serious disease in oats. [5]
Victoria type oats contain the Pc-2 gene which confers resistance against crown rust caused by the fungus Puccinia coronate. However, the oats that contained this gene are susceptible to Victoria blight. This is because the gene LOV1, which is part of the crown rot resistance, is responsible for susceptibility to Victoria blight. [6] Cochliobolus victoriae produces the toxin victorin. Victorin only effects plants that contain the LOV1 gene, causing these plants to develop Victoria blight. [7]
The oat, sometimes called the common oat, is a species of cereal grain grown for its seed, which is known by the same name. Oats are used for human consumption as oatmeal and rolled oats. Oats are a nutrient-rich food associated with lower blood cholesterol and reduced risk of human heart disease when consumed regularly. One of the most common uses of oats is as livestock feed.
Rusts are fungal plant pathogens of the order Pucciniales causing plant fungal diseases.
Fusarium ear blight (FEB), is a fungal disease of cereals, including wheat, barley, oats, rye and triticale. FEB is caused by a range of Fusarium fungi, which infects the heads of the crop, reducing grain yield. The disease is often associated with contamination by mycotoxins produced by the fungi already when the crop is growing in the field. The disease can cause severe economic losses as mycotoxin-contaminated grain cannot be sold for food or feed.
Blight refers to a specific symptom affecting plants in response to infection by a pathogenic organism.
Avenanthramides are a group of phenolic alkaloids found mainly in oats, but also present in white cabbage butterfly eggs, and in fungus-infected carnation. A number of studies demonstrate that these natural products have anti-inflammatory, antioxidant, anti-itch, anti-irritant, and antiatherogenic activities. Oat kernel extracts with standardized levels of avenanthramides are used for skin, hair, baby, and sun care products. The name avenanthramides was coined by Collins when he reported the presence of these compounds in oat kernels. It was later found that three avenanthramides were the open-ring amides of avenalumins I, II, and III, which were previously reported as oat phytoalexins by Mayama and co-workers.
Cochliobolus miyabeanus is a fungus that causes brown spot disease in rice.
The fungus Cochliobolus sativus is the teleomorph of Bipolaris sorokiniana (anamorph) which is the causal agent of a wide variety of cereal diseases. The pathogen can infect and cause disease on roots, leaf and stem, and head tissue. C. sativus is extremely rare in nature and thus it is the asexual or anamorphic stage which causes infections. The two most common diseases caused by B. sorokiniana are spot blotch and common root rot, mainly on wheat and barley crops.
Spot blotch is a leaf disease of wheat caused by Cochliobolus sativus. Cochliobolus sativus also infects other plant parts and in conjunction with other pathogens causes common root rot and black point.
Alternaria alternata is a fungus causing leaf spots, rots, and blights on many plant parts, and other diseases. It is an opportunistic pathogen on over 380 host species of plant.
Frances Meehan Latterell was an American plant pathologist whose research in the late 1940s opened a major new area of inquiry into the physiological basis of plant disease. She was the senior author on a classic 1947 paper showing that the toxin victorin, produced by the pathogenic fungus Helminthosporium victoriae, caused symptoms of Victoria blight of oats, a new disease first described by Latterell and her major professor in 1946. This discovery of a host-specific toxin, as victorin was later named, gave scores of subsequent researchers new model systems for studying plant disease.
Alternaria solani is a fungal pathogen that produces a disease in tomato and potato plants called early blight. The pathogen produces distinctive "bullseye" patterned leaf spots and can also cause stem lesions and fruit rot on tomato and tuber blight on potato. Despite the name "early," foliar symptoms usually occur on older leaves. If uncontrolled, early blight can cause significant yield reductions. Primary methods of controlling this disease include preventing long periods of wetness on leaf surfaces and applying fungicides. Early blight can also be caused by Alternaria tomatophila, which is more virulent on stems and leaves of tomato plants than Alternaria solani.
Cochliobolus carbonum is one of more than 40 species of filamentous ascomycetes belonging to the genus Cochliobolus. This pathogen has a worldwide distribution, with reports from Australia, Brazil, Cambodia, Canada, China, Congo, Denmark, Egypt, India, Kenya, New Zealand, Nigeria, Solomon Islands, and the United States. Cochliobolus carbonum is one of the most aggressive members of this genus infecting sorghum, corn and apple. As one of the most devastating pathogens of sweet corn, C. carbonum causes Northern leaf spot and ear rot disease while the asexual stage causes Helminthosporium corn leaf spot. Cochliobolus carbonum is pathogenic to all organs of the corn plant including root, stalk, ear, kernel, and sheath. However, symptoms of infection show distinct manifestations in different plant parts: whole plant - seedling blight affects the whole plant, leaf discoloration and mycelial growth, black fungal spores and lesions appear on inflorescences and glumes, and grain covered with very dark brown to black mycelium which gives a characteristic charcoal appearance due to the production of conidia.
Cochliobolus lunatus is a fungal plant pathogen that can cause disease in humans and other animals. The anamorph of this fungus is known as Curvularia lunata, while C. lunatus denotes the teleomorph or sexual stage. They are, however, the same biological entity. C. lunatus is the most commonly reported species in clinical cases of reported Cochliobolus infection.
Setosphaeria turcica is the causal agent of northern corn leaf blight in maize. It is a serious fungal disease prevalent in cooler climates and tropical highlands wherever corn is grown. It is characterized by large cigar shaped necrotic lesions that develop on the leaves due to the polyketide metabolite monocerin.
Puccinia coronata is a plant pathogen and causal agent of oat and barley crown rust. The pathogen occurs worldwide, infecting both wild and cultivated oats. Crown rust poses a threat to barley production, because the first infections in barley occur early in the season from local inoculum. Crown rusts have evolved many different physiological races within different species in response to host resistance. Each pathogenic race can attack a specific line of plants within the species typical host. For example, there are over 290 races of P. coronata. Crops with resistant phenotypes are often released, but within a few years virulent races have arisen and P. coronata can infect them.
Helminthosporium solani is a fungal plant pathogen responsible for the plant disease known as silver scurf. Silver scurf is a blemish disease, meaning the effect it has on tubers is mostly cosmetic and affects "fresh market, processing and seed tuber potatoes." There are some reports of it affecting development, meaning growth and tuber yield. This is caused by light brown lesions, which in turn change the permeability of tuber skin and then it causes tuber shrinkage and water loss, which finally causes weight loss. The disease has become economically important because silver scurf affected potatoes for processing and direct consumption have been rejected by the industry. The disease cycle can be divided into two stages: field and storage. It is mainly a seed borne disease and the primary source of inoculum is mainly infected potato seed tubers. Symptoms develop and worsen in storage because the conditions are conducive to sporulation. The ideal conditions for the spread of this disease are high temperatures and high humidity. There are also many cultural practices that favor spread and development. There are multiple ways to help control the disease.
This article summarizes different crops, what common fungal problems they have, and how fungicide should be used in order to mitigate damage and crop loss. This page also covers how specific fungal infections affect crops present in the United States.
Southern corn leaf blight (SCLB) is a fungal disease of maize caused by the plant pathogen Bipolaris maydis.
Agriculture in Finland is characterized by the northern climate and self-sufficiency in most major agricultural products. Its economic role is declining in terms of GNP and employment in primary production, but together with the food industry and forestry with which it is linked, it forms a significant part of the Finnish economy. The number of farms has steadily declined for the last decades. Between 2000 and 2012 their number fell from almost 80,000 in 2000 to about 60,000, while the amount of arable land has slightly increased to a total of almost 2.3 million hectares. Agriculture employed 125,000 people in 2010, which is a drop of 30 percent from 2000.
Northern corn leaf blight (NCLB) or Turcicum leaf blight (TLB) is a foliar disease of corn (maize) caused by Exserohilum turcicum, the anamorph of the ascomycete Setosphaeria turcica. With its characteristic cigar-shaped lesions, this disease can cause significant yield loss in susceptible corn hybrids.