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Bacterial seedling blight of rice (Oryza sativa), caused by pathogen Burkholderia plantarii [4] Early blight of potato and tomato, caused by species of the ubiquitous fungal genus Alternaria; Leaf blight of the grasses e.g. Ascochyta species [5] and Alternaria triticina that causes blight in wheat [6]
Pseudomonas syringae is a rod-shaped, Gram-negative bacterium with polar flagella.As a plant pathogen, it can infect a wide range of species, and exists as over 50 different pathovars, [2] all of which are available to researchers from international culture collections such as the NCPPB, ICMP, and others.
Fire blight on a pear tree caused by Erwinia amylovora. Tissues affected by the symptoms of Erwinia amylovora include blossoms, fruits, shoots, and branches of apple (Pomoideae), pear, and many other rosaceous plants. All symptoms are above ground and are typically easy to recognize.
Bacterial blight develops on the upper leaves of during periods of cool, wet weather, after the plants have reached the boot stage. Leaf blight is associated with high relative humidity, wet weather, and cool spring temperatures (15–25 degrees C or 60–75 degrees F). Warm, dry weather stops the disease and new emerging leaves may be ...
Citrus blight is a type of plant blight. The effects of citrus blight were first documented in the early 20th century. The disease afflicts plants in tropical and subtropical environments; regions impacted by the disease include North America and South America, the Caribbean, South Africa, and Australia.
Bacterial blight is endemic to green bean crops grown east of the Rocky Mountains. [64] During ideal conditions (usually humid weather) the disease can inflict losses as high as 60%. [95] Symptoms include lesions resembling burn marks that gradually grow larger. [94] In some states incidence of the disease can be as high as 100%. [96]
Other symptoms include stunting, chlorosis or yellowing of the leaves, necrosis or tissue death, and defoliation. Internal vascular tissue discoloration might be visible when the stem is cut. [2] In Verticillium, the symptoms and effects will often only be on the lower or outer parts of plants or will be localized to only a few branches of a ...
Significant variation in symptoms is seen between diseases, though some symptoms are expressed across species. On a macroscopic scale, plants infected with a X. fastidiosa-related disease exhibit symptoms of water, zinc, and iron deficiencies, [27] manifesting as leaf scorching and stunting in leaves turning them yellowish-brown, gummy substance around leaves, [27] fruit reduction in size and ...