| citrus huanglongbing in são paulo state, brazil: pcr detection of the 'candidatus' liberibacter species associated with the disease. | symptoms of huanglongbing (hlb), one of the most serious diseases of citrus in asia and africa, have been noticed in march 2004 in the araraquara region of são paulo state, brazil. hlb has not been reported previously from america. the causal hlb bacteria, candidatus liberibacter africanus in africa and candidatus liberibacter asiaticus in asia, can be detected in symptomatic citrus leaves by pcr amplification of their 16s rdna with previously described primers. when this technique was applied t ... | 2005 | 15797817 |
| etiology of three recent diseases of citrus in são paulo state: sudden death, variegated chlorosis and huanglongbing. | the state of são paulo (ssp) is the first sweet orange growing region in the world. yet, the ssp citrus industry has been, and still is, under constant attack from various diseases. in the 1940s, tristeza-quick decline (t-qd) was responsible for the death of 9 million trees in ssp. the causal agent was a new virus, citrus tristeza virus (ctv). the virus was efficiently spread by aphid vectors, and killed most of the trees grafted on sour orange rootstock. control of the disease resided in replac ... | 2007 | 17505974 |
| distribution and quantification of candidatus liberibacter americanus, agent of huanglongbing disease of citrus in são paulo state, brasil, in leaves of an affected sweet orange tree as determined by pcr. | huanglongbing (hlb), an insect-transmitted disease of citrus, known for many years in asia and africa, has appeared in the state of são paulo state (ssp), brazil, in 2004, and the state of florida, usa, in 2005. hlb endangers the very existence of citrus, as trees infected with the bacterial pathogen, irrevocably decline. in the absence of curative procedures, control of hlb is difficult and only based on prevention. even though not available in culture, the hlb bacterium could be shown to be gr ... | 2008 | 18400468 |
| rapid and sensitive detection of candidatus liberibacter asiaticus by loop mediated isothermal amplification combined with a lateral flow dipstick. | citrus huanglongbing (hlb) is the most devastating bacterial citrus disease worldwide. three candidatus liberibacter species are associated with different forms of the disease: candidatus liberibacter asiaticus, candidatus liberibacter americanus and candidatus liberibacter africanus. amongst them, candidatus liberibacter asiaticus is the most widespread and economically important. these gram-negative bacterial plant pathogens are phloem-limited and vectored by citrus psyllids. the current manag ... | 2014 | 24708539 |
| draft genome sequence of "candidatus liberibacter americanus" bacterium associated with citrus huanglongbing in brazil. | we report here the draft genome sequence of "candidatus liberibacter americanus" strain pw_sp. the 1,176,071-bp genome, with 31.6% g+c content, comprises 948 open reading frames, 38 trnas, and three complete rrnas. | 2013 | 23704186 |
| defining the core citrus leaf- and root-associated microbiota: factors associated with community structure and implications for managing huanglongbing (citrus greening) disease. | stable associations between plants and microbes are critical to promoting host health and productivity. the objective of this work was to test the hypothesis that restructuring of the core microbiota may be associated with the progression of huanglongbing (hlb), the devastating citrus disease caused by liberibacter asiaticus, liberibacter americanus, and liberibacter africanus the microbial communities of leaves (n = 94) and roots (n = 79) from citrus trees that varied by hlb symptom severity, c ... | 2017 | 28341678 |
| oral delivery of double-stranded rnas induces mortality in nymphs and adults of the asian citrus psyllid, diaphorina citri. | the asian citrus psyllid (acp), diaphorina citri kuwayama, is one of the most important citrus pests. acp is the vector of the phloem-limited bacteria candidatus liberibacter americanus and candidatus liberibacter asiaticus, the causal agents of the devastating citrus disease huanglongbing (hlb). the management of hlb is based on the use of healthy young plants, eradication of infected plants and chemical control of the vector. rna interference (rnai) has proven to be a promising tool to control ... | 2017 | 28282380 |
| candidatus liberibacter americanus induces significant reprogramming of the transcriptome of the susceptible citrus genotype. | citrus huanglongbing (hlb) disease is caused by endogenous, phloem-restricted, gram negative, uncultured bacteria named candidatus liberibacter africanus (calaf), ca. l. asiaticus (calas), and ca. l. americanus (calam), depending on the continent where the bacteria were first detected. the asian citrus psyllid vector, diaphorina citri, transmits calas and calam and both liberibacter species are present in brazil. several studies of the transcriptional response of citrus plants manifesting hlb sy ... | 2013 | 23586643 |
| sulfur volatiles from allium spp. affect asian citrus psyllid, diaphorina citri kuwayama (hemiptera: psyllidae), response to citrus volatiles. | the asian citrus psyllid, diaphorina citri kuwayama, vectors candidatus liberibacter asiaticus (las) and candidatus liberibacter americanus (lam), the presumed causal agents of huanglongbing. d. citri generally rely on olfaction and vision for detection of host cues. plant volatiles from allium spp. (alliaceae) are known to repel several arthropod species. we examined the effect of garlic chive (a. tuberosum rottl.) and wild onion (a. canadense l.) volatiles on d. citri behaviour in a two-port d ... | 2011 | 20609277 |