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Candidatus Liberibacter
''Liberibacter'' is a genus of Gram-negative bacteria in the Rhizobiaceae family. Detection of the liberibacteria is based on PCR amplification of their 16S rRNA gene with specific primers. Members of the genus are plant pathogens mostly transmitted by psyllids. The genus was originally spelled ''Liberobacter''. Most importantly, ''Liberibacter'' is a causative agent of Huanglongbing disease (HLB) also known as citrus greening disease. ''Liberibacter'' is transmitted by two insects from Psyllidae family – '' Diaphorina citri'' in Asia, Brazil and Florida, and ''Trioza erytreae'' in Africa. The Asian HLB strain, "''Candidatus'' Liberibacter asiaticus" is more heat tolerant, while the African strain, ''Candidatus'' Liberibacter africanus is asymptomatic at temperatures above 30 °C. Species of ''Liberibacter'', infecting solanaceous plants has been identified and it was carried by another psyllid, a potato pest ''Bactericera cockerelli''. Pathogenicty ''Liberibacter'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bactericera Cockerelli
''Bactericera cockerelli'', also known as the potato psyllid, is a species of Psylloidea, psyllid native to southern North America. Its range extends from Central America north to the American Pacific Northwest and parts of Manitoba, in Canada. It is restricted to the western part of the continent. As its name suggests, it is commonly found on potato and tomato crops, but has a species range that encompasses over 40 species of Solanaceae, solanaceous plants and as many as 20 genera. Breeding hosts are generally recognised as being restricted primarily to Solanaceae, including important crop and common weed species, and a few species of Convolvulaceae, including bindweed and sweet potato. On some plants, especially potato, feeding of the nymphs causes a condition called psyllid yellows, presumed to be the result of a toxin. Both nymphs and adults can transmit the bacterium Candidatus Liberibacter. Zebra chip is a recently diagnosed disease of potatoes associated with psyll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |