Charles Darwin University

CDU eSpace
Institutional Repository

 
CDU Staff and Student only
 

Use of survival analysis and space-time point pattern analysis to study the epidemiology of papaya yellow crinkle in Australia

Esker, P., Gibb, Karen, Dixon, P. and Nutter, F. (2005). Use of survival analysis and space-time point pattern analysis to study the epidemiology of papaya yellow crinkle in Australia. Phytopathology: international journal of the American Phytopathological Society,95(Suppl. 6):S128-S128.

Document type: Journal Article
Citation counts: Google Scholar Search Google Scholar

IRMA ID 80802555xPUB12
Title Use of survival analysis and space-time point pattern analysis to study the epidemiology of papaya yellow crinkle in Australia
Author Esker, P.
Gibb, Karen
Dixon, P.
Nutter, F.
Journal Name Phytopathology: international journal of the American Phytopathological Society
Publication Date 2005
Volume Number 95
Issue Number Suppl. 6
ISSN 0031-949X   (check CDU catalogue open catalogue search in new window)
Start Page S128
End Page S128
Total Pages 1
Place of Publication Minnesota, USA
Publisher The American Phytopathological Society
Field of Research 0605 - Microbiology
0607 - Plant Biology
HERDC Category C1 - Journal Article (DEST)
Abstract The epidemiology of papaya yellow crinkle in Australia was studied by testing hypotheses regarding the influence of tomato big bud (TBB) and sweet potato little leaf V4 (SPLL-V4) phytoplasma strains, papaya plant age, and seasonal (wet/dry) effects on post-incubation time-to-death (TDD) in papaya with survival analysis. Survival analyses were applied to 36-consecutive monthly incidence assessments in a papaya plantation in the Northern Territory, Australia. These methods included Kaplan-Meier estimates of survival functions, accelerated failure time models, and Cox proportional hazards. No differences in TDD between TBB and SPLL-V4 infected papaya were observed. Moreover, neither plant age or seasonal effects influenced TDD. Post-incubation TDD ranged from 4 to 5.5 months. We also used spacetime point pattern analysis to study spatial and temporal dependence for both TBB and SPLL-V4. This approach simultaneously tests the interaction between space and time to quantify space-time windows with increased disease risk. Based on spatial analysis only, SPLL-V4 infected papaya was aggregated upwards of 30 m (10-15 plants along or across rows), whereas TBB-infected papaya was randomly dispersed. However, based on space-time analysis small-scale aggregation of infected plants (< 10 m spatially and < 5 months temporally) for TBB-infected papaya was observed.
Additional Notes Abstract Only
 
Versions
Version Filter Type
Access Statistics: 72 Abstract Views  -  Detailed Statistics
Created: Thu, 05 Mar 2009, 12:21:20 CST by Sarena Wegener