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Funded Project

Funding Program: Integrated Pest Management Competitive Grants Program

Project Title: Aerobiology and IPM of Bacterial Blight in Carrot Seed Crops

Project Director (PD): Jeremiah Dung [1]

Lead State: OR Lead Organization: Oregon State University

Undesignated Funding: $29,747

Start Date: Mar-01-2019 End Date: Feb-29-2020

Summary: This Project Initiation proposal will fill knowledge gaps in bacterial blight epidemiology and develop forecasting models for carrot seed crops in Oregon, a primary producer of hybrid carrot seed. The objectives of this research are to: 1) quantify and characterize temporal dynamics of X. hortorum pv. carotae (Xhc) dispersal during carrot seed production; and 2) identify weather factors that contribute to Xhc dispersal. By combining air sampling protocols with a quantitative PCR assay, this project will quantify and model Xhc dispersal during carrot seed production. Air sample and quantitative PCR data will be analyzed with weather data collected from fields and weather stations to identify weather factors that are associated with dispersal events. The effect of production practices on Xhc dispersal will also be evaluated. Together these data can be used to build disease prediction models to inform growers of inoculum risk and improve control through better-timed bactericide applications, modified cultural practices, and increased knowledge of bacterial blight epidemiology in carrot seed crops. This project addresses an important pest issue and concern as identified by carrot stakeholders in the Pest Management Strategic Plans of California, Michigan, and New Jersey. A better understanding of bacterial blight epidemiology in hybrid carrot seed production systems of Oregon will enhance IPM-based strategies, minimize seed infestation by Xhc, lessen the need for hot water treatments, and reduce bacterial blight epidemics in subsequent carrot root crops. Objectives: The objectives of this research are to: 1) quantify and characterize temporal dynamics of X. hortorum pv. carotae (Xhc) dispersal during carrot seed production; and 2) identify weather factors that contribute to Xhc dispersal.

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