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Erysiphe graminis f.sp. tritici is a plant pathogen that causes a fungal infection known as powdery mildew. It is most common in grains, and it can be identified by the characteristic white spots on leaves and stems that appear to be made of powder. Powdery mildew is one of the most widespread and easily recognizable plant diseases.
Curtobacterium flaccumfaciens can overwinter in plant debris, diseased plants, wild hosts, seeds, or vegetative propagative organs. The bacteria can survive only a couple of weeks as free bacteria in soil. Multiple factors go into survival of a bacterial population, including temperature, humidity, and soil characteristics.
Life cycle of the black rot pathogen, the gram negative bacterium Xanthomonas campestris pathovar campestris. Plant pathology or phytopathology is the scientific study of plant diseases caused by pathogens (infectious organisms) and environmental conditions (physiological factors). [1]
It also helps if plants are planted in well-drained soils, at intervals appropriate for adequate ventilation between plants. Few varieties are resistant to the disease and none are immune, so rotating susceptible plants with non-susceptible ones like cereals is a practice positive to limiting soft rot infection.
Young strawberry plants, around 25–30 days of age, have the highest susceptibility to the Phomopsis obscurans pathogen. Characteristics of young plant tissue, such as under-developed cuticles and cell walls, make the tissue highly susceptible to easy penetration of the pathogen and thus, more rapid colonization of the pathogen in the host tissue.
The Phytomyxea are a class of parasites that are cosmopolitan, obligate biotrophic protist parasites of plants, diatoms, oomycetes and brown algae. [1] They are divided into the orders Plasmodiophorida ( ICZN , or Plasmodiophoromycota , ICBN ) and Phagomyxida . [ 2 ]
Aphanomyces euteiches is a water mould, or oomycete, plant pathogen responsible for the disease Aphanomyces root rot. The species Aphanomyces euteiches can infect a variety of legumes. Symptoms of the disease can differ among hosts but generally include reduced root volume and function, leading to stunting and chlorotic foliage.
In 1961 Sanwal listed 33 species and provided a key. [3]The most important species of these are Aphelenchoides ritzemabosi, the chrysanthemum foliar nematode; Aphelenchoides fragariae, the spring crimp or spring dwarf nematode of strawberry, which also attacks many ornamentals; and Aphelenchoides besseyi, causing summer crimp or dwarf of strawberry and white tip of rice.