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Plant disease. Plant diseases are diseases in plants caused by pathogens (infectious organisms) and environmental conditions (physiological factors). [ 1] Organisms that cause infectious disease include fungi, oomycetes, bacteria, viruses, viroids, virus -like organisms, phytoplasmas, protozoa, nematodes and parasitic plants. [ 2]
Citrus canker. Citrus canker is a disease affecting Citrus species caused by the bacterium Xanthomonas ( X.axonopodis; X. campestris ). Infection causes lesions on the leaves, stems, and fruit of citrus trees, including lime, oranges, and grapefruit. While not harmful to humans, canker significantly affects the vitality of citrus trees, causing ...
Citrus greening disease or yellow dragon disease[ 4] ( calque of Chinese: 黃龍病; pinyin: huánglóngbìng abbr. HLB) [ 5] is a disease of citrus caused by a vector -transmitted pathogen. The causative agents are motile bacteria, Liberibacter spp. The disease is transmitted by the Asian citrus psyllid, Diaphorina citri, and the African ...
Plant pathology or phytopathology is the scientific study of plant diseases caused by pathogens (infectious organisms) and environmental conditions (physiological factors). [ 1] Plant pathology involves the study of pathogen identification, disease etiology, disease cycles, economic impact, plant disease epidemiology, plant disease resistance ...
Aster yellows is a chronic, systemic plant disease caused by several bacteria called phytoplasma. [ 1] The aster yellows phytoplasma (AYP) affects 300 species in 38 families of broad-leaf herbaceous plants, primarily in the aster family, as well as important cereal crops such as wheat and barley. Symptoms are variable and can include phyllody ...
Bacterial soft rots are caused by several types of bacteria, but most commonly by species of gram-negative bacteria, Erwinia, Pectobacterium, and Pseudomonas. It is a destructive disease of fruits, vegetables, and ornamentals found worldwide, and affects genera from nearly all the plant families. The bacteria mainly attack the fleshy storage ...
Bacterial wilt caused by R. solanacearum is of economic importance because it infects over 250 plant species in over 50 families. As of 2007, this pathogen has affected over 450 host species representing 54 plant families due to its broad host range around the world. [29] The disease is known as southern wilt, bacterial wilt, and brown rot of ...
Xylella fastidiosa can infect an extremely wide range of plants, many of which do not show any symptoms of disease. [11] Disease occurs in plant species that are susceptible due to blockage of water flow in the xylem vessels caused by several factors: bacterial obstruction, overreaction of the plant immune response (tylose formation), and ...