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United States Department of Agriculture

Agricultural Research Service

Research Project: Epidemiological Framework Development for Management of Phytophthora Ramorum in Nursery Systems

Location: Horticultural Crops Research

Project Number: 5358-22000-039-10
Project Type: Reimbursable

Start Date: Oct 01, 2011
End Date: Sep 30, 2012

Objective:
1. Parameter estimation of transmission rates and dispersal kernels for foliar Phytophthora spp. on Rhododendron in nursery settings. a. Parameter estimation for P. ramorum at NORSDUC b. Parameter estimation for P. citricola at Corvallis 2. Development and validation of spatially-explicit epidemiological model for invasion. within nurseries to screen potential management scenarios 3. Evaluation of different management scenarios for control of P. ramorum in nursery settings.

Approach:
We propose to use a combination of small-scale ‘challenge experiments’ with which to estimate transmission probabilities, percolation thresholds and incubation periods that are then used to parameterize models from which to predict efficient methods for control. The challenge experiments will be complemented by population experiments to test and modify the model predictions for invasion and disease control. Simple percolation and network models will be parameterized to estimate biologically meaningful parameters such as transmission rates and dispersal kernels for both Phytophthora species within nurseries. The simple susceptible-infected model will be refined to give spatially explicit models based on the SIR (susceptible, infected, removed) family of modeling approaches, but with several important adaptations for plant disease.

Last Modified: 7/30/2014
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