CHRF Poster Supplemental Information

 A model for the spread of HLB attributed to Diaphorina citri

 

Poster Supplemental Information
A poster presentation at the Third Annual Citrus Health Research Forum in Fort Collins, CO in August 2012. The purpose of the poster is to understand the dual pathways of adult/nymph-to-nymph transmission and its impact on the dynamics of the spread of citrus greening.This is joint work with Susan Halbert, Burt Singer, and James Keesling. Poster---FinalOnline

Model I – Procedure
This video clip shows the infected trees in a grove, simulated using the standard model (Model I). The red dots on the left side represent the time as the computer speed is slower with more trees that are infected.

Figures

Trees Producing Infected AdultsFigure 1 compare the number of trees that produce infected psyllids between models. Figure 2 compares the effect of varying the rates of the Adult/Nymph-to-Nymph transmission while assuming the vertical transmission is 5%.

Figure 1 compares the standard model (blue line) having latent
period 90 days with the proposed model (red line) having dual
pathways of adult/nymph-to-nymph transmission in a simulated
grove with 10,000 trees.
Figure 2 uses the proposed model to compare te effect of
varying adult/nymph-to-nymph transmission while holding
the vertical transmission constant at 5%.

References
  • Gottwald, T. R., da Graça, J. V., and Bassanezi, R. B. 2007. Citrus Huanglongbing: The pathogen and its impact. Online. Plant Health Progress doi:10.1094/PHP-2007-0906-01-RV.
  • Pelz-Stelinski, K. S., R.H. Brlansky, and M.E. Rogers. 2010. Transmission of Candidatus Liberibacter asiaticus by the Asian citrus psyllid, Diaphorina citri. Journal of Economic Entomology. 103: 1531-1541