Candidatus Liberibacter asiaticus: virulence traits and control strategies

Andrade, Maxuel O.; Li, Jinyun; Wang, Nian

doi:10.1007/s40858-020-00341-0

Cited by 21 publications

(22 citation statements)

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“…Citrus huanglongbing (HLB), also called citrus greening disease, is currently the most destructive citrus disease affecting the global citrus industry and causes significant economic losses worldwide (Blaustein et al 2018;Wang 2019; Andrade et al 2020). HLB is associated with the three phloem-colonizing and uncultured bacterial species of 'Candidatus Liberibacter': 'Ca.…”

Section: Introductionmentioning

confidence: 99%

“…L. americanus' (Lam) in Brazil (Bové 2006;Gottwald et al 2007;Wang 2020). Among them, Las is the most prevalent species worldwide (Bové 2006;Gottwald 2010;Wang et al 2017b;Andrade et al 2020). Las is naturally transmitted to citrus by the Asian citrus psyllid (ACP, Diaphorina citri Kuwayama) during feeding on citrus plants (Bové 2006).…”

Section: Introductionmentioning

confidence: 99%

“…HLB disease symptoms include leaf mottling, yellow shoots, dead and dying twigs, deformed and discolored fruits, premature fruit drop, root decline, and eventually tree mortality (Bové 2006;Gottwald 2010;Johnson et al 2014). Most commercial citrus varieties are susceptible to Las infection, with few, such as Sugar Belle, showing tolerance to HLB (Clark et al 2018;Wang 2019;Andrade et al 2020). Since it was first identified in East Asia over 100 years ago, HLB has spread to most citrus producing areas in the world, including Asia, Africa, and the Americas, except Australia and the Mediterranean region (Wang 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Currently, there are no practical cures for HLB (Andrade et al 2020). Different HLB management strategies are being implemented in different citrus producing areas depending on the overall HLB incidence in the corresponding region.…”

Section: Introductionmentioning

confidence: 99%

“…Different HLB management strategies are being implemented in different citrus producing areas depending on the overall HLB incidence in the corresponding region. For example in China, a comprehensive HLB control strategy is being used including control of the insect vector ACP, and eradication of symptomatic trees, as well as the use of pathogen-free seedlings for new plantings (Wang et al 2017a;Blaustein et al 2018;Andrade et al 2020). However, in many citrus producing areas where HLB is endemic or has high incidence, such as Florida, inoculum eradication is largely abandoned (Graham et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the control effect of SAR inducers against citrus Huanglongbing applied by foliar spray, soil drench or trunk injection

Kolbasov

Pang

et al. 2021

Phytopathol Res

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Huanglongbing (HLB) or greening disease, associated with the bacterial pathogen Candidatus Liberibacter asiaticus (Las), is currently the most devastating citrus disease worldwide and no cure is available. Inducers of systemic acquired resistance (SAR) are effective and sustainable to combat various plant diseases. In this study, the SAR inducers acibenzolar-S-methyl (ASM), imidacloprid (IMI), 2,6-dichloroisonicotinic acid (INA), and salicylic acid (SA), applied individually by foliar spray, soil drench or trunk injection at various rates and frequencies, were evaluated for control of HLB in a 3-year field trial with mature Hamlin sweet orange trees in central Florida, USA in the 2016, 2017, and 2018 crop seasons. Six foliar sprays, six soil applications, and three trunk injections of ASM, IMI, INA, or SA per year were conducted with the untreated as a negative control. HLB disease severity, Las titers, pre-harvest fruit drop, yield and fruit quality were investigated for the treatments. By the end of the 2018 season, all trunk injection treatments at 0.25 g/tree and foliar sprays of INA or SA (but not ASM or IMI) at 0.5 g/tree significantly reduced disease severity, Las population, and fruit drop, and increased fruit yield; whereas all foliar spray treatments at 0.25 g/tree, trunk injection treatments at 0.125 g/tree, and soil drench treatments at 0.25 or 0.5 g/tree did not provide effective control of HLB. Additionally, all trunk injection treatments at 0.25 g/tree had shown a significant decrease in fruit drop and increase of fruit yield starting from 2016 after 1 year of applications, whereas foliar sprays of INA or SA at 0.5 g/tree exhibited similar effects at 2018 after 3 years of applications. None of the SAR inducer treatments had significant effect on fruit quality. Economic analysis suggested that the trunk injection treatments at 0.25 g/tree might produce financial benefits. Overall, this study presents useful information for management of citrus HLB with SAR inducers.

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Section: Introductionmentioning

confidence: 99%