Incidence of Candidatus Liberibacter asiaticus Infection in Abandoned Citrus Occurring in Proximity to Commercially Managed Groves

Tiwari, Siddharth; Lewis-Rosenblum, Hannah; Pelz‐Stelinski, Kirsten S.; Stelinski, Lukasz L.

doi:10.1603/ec10149

Cited by 82 publications

(68 citation statements)

References 12 publications

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“…Increasing the maturation rate or decreasing the growth rate of flush leads to a reduction in the spread of infection in a tree. This reduction is in agreement with decreased vector activity in a grove with diminished flush production (31).…”

Section: Discussionsupporting

confidence: 79%

“…This might be attributed to the fact that as much of the tree becomes symptomatic, growth of new flush decreases (23), so that the vectors will search for other trees with flush to lay their eggs (31). Indeed, the parameter reflecting the flush maturation rate and thus the availability of flush ( ξ) has the most effect on the dynamics of the HLB infection.…”

Section: Discussionmentioning

confidence: 99%

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Modeling huanglongbing transmission within a citrus tree

Chiyaka

Singer

Halbert

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

100

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The citrus disease huanglongbing (HLB), associated with an uncultured bacterial pathogen, is threatening the citrus industry worldwide. A mathematical model of the transmission of HLB between its psyllid vector and citrus host has been developed to characterize the dynamics of the vector and disease development, focusing on the spread of the pathogen from flush to flush (a newly developing cluster of very young leaves on the expanding terminal end of a shoot) within a tree. This approach differs from that of prior models for vector-transmitted plant diseases where the entire plant is the unit of analysis. Dynamics of vector and host populations are simulated realistically as the flush population approaches complete infection. Model analysis indicates that vector activity is essential for initial infection but is not necessary for continued infection because infection can occur from flush to flush through internal movement in the tree. Flush production, withintree spread, and latent period are the most important parameters influencing HLB development. The model shows that the effect of spraying of psyllids depends on time of initial spraying, frequency, and efficacy of the insecticides. Similarly, effects of removal of symptomatic flush depend on the frequency of removal and the time of initiation of this practice since the start of the epidemic. Within-tree resistance to spread, possibly affected by inherent or induced resistance, is a major factor affecting epidemic development, supporting the notion that alternate routes of transmission besides that by the vector can be important for epidemic development.greening | Candidatus Liberibacter asiaticus | Diaphorina citri

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Modeling huanglongbing transmission within a citrus tree

Chiyaka

Singer

Halbert

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

100

View full text Add to dashboard Cite

show abstract

“…Diaphorina citri ingests primarily phloem sap; it mates, reproduces, and develops only on the growing tips of terminal shoots of Citrus and related genera (Halbert and Munjunath 2004). Diaphorina citri can move over large distances in a relatively short time (Nakata 2008, Boina et al 2009, Tiwari et al 2010). Our understanding of D. citri host-plant selection behaviors still is rudimentary.…”

mentioning

confidence: 99%

Multimodal Cues Drive Host-Plant Assessment in Asian Citrus Psyllid (Diaphorina citri)

et al. 2011

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Asian citrus psyllid (Diaphorina citri) transmits the causal agent of Huanglongbing, a devastating disease of citrus trees. In this study we measured behavioral responses of D. citri to combinations of visual, olfactory, and gustatory stimuli in test arenas. Stimuli were presented to the psyllids in droplets or lines of an emulsified wax formulation in two different arena types in no-choice tests. First, when placed on a colored ring situated halfway between the center and perimeter of a petri dish, D. citri spent more time on yellow versus gray rings; however, this response disappeared when either gray or yellow wax droplets were applied. When the psyllids were presented with droplets scented with terpenes, the response to both scent and color was increased. The addition of a dilute (≍0.1 M) sucrose solution to the wax droplets increased the magnitude of D. citri responses. Next, groups of D. citri were placed on plastic laboratory film covering a sucrose solution, to mimic a leaf surface. Test stimuli were presented via two 'midribs' made from lines of emulsified wax formulation. Probing levels were measured as a function of color saturation and scent composition, and concentration. The test scents were based on qualitatively major volatiles emitted by Murraya paniculata (L.) Jack, Citrus aurantifolia (Christm.) Swingle, and C. sinensis (L.) Osbeck. The highest probing response was observed on the middle concentration (20-μl scent/10 ml wax formulation) of the C. aurantifolia-scented wax lines. Results indicate that there are interactive effects between the different sensory modalities in directing host-plant assessment behavior.

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“…This likely contributes to infection of neighboring orchards with CLas-infected psyllids. However, the major problem in Florida spans beyond the "bad neighbor" effect given that there were approximately 51,386 ha of abandoned citrus in Florida in 2013 (US Department of Agriculture, 2013) that receive no insecticidal treatment and are an important source of CLas-infected psyllids (Tiwari et al, 2010). It is known that D. citri move frequently from abandoned to managed orchards (Boina et al, 2009;Lewis-Rosenblum et al, 2015).…”

Section: Introductionmentioning

confidence: 99%