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Funded Project

Funding Program: Integrated Pest Management Competitive Grants Program

Project Title: Distribution and diversity of barley yellow dwarf virus in Eastern Oregon grass seed production

Project Director (PD): Frost Kenneth [1]

Lead State: OR Lead Organization: Oregon State University

Undesignated Funding: $29,990

Start Date: Mar-01-2017 End Date: Mar-01-2017

Pests Involved: Barley yellow dwarf virus

Site/Commodity: Grass grown for seed

Area of Emphasis: Plant Pathology and Disease Management

Summary: Barley yellow dwarf (BYD), is a disease of small grains and cereals such as wheat, barley, and oats caused by the Barley yellow dwarf virus (BYDV). BYDV is the most detrimental virus of small grains. It has an extensive and diverse host range infecting over 150 monocotyledonous plant species, including many agronomically important field crops and grasses grown for seed. Symptoms caused by BYDV are variable and environmentally dependent. The virus is restricted to the phloem tissues of the infected plant and reduces the movement of the sugars produced by the leaves within the plant body. In grain crops, BYDV infection leads to yield losses which can be large if infection occurs early in the growing season. In grass grown for seed, little is known about the prevalence or yield loss that may be caused by BYDV infection, grass seed crops are typically perennial and losses due may occur annually. In total, we propose to 1) characterize the genetic diversity of BYDV strains affecting susceptible perennial ryegrass (PRG) crops being grown for seed and nearby cereal crops to better understand which BYDV strain or set of strains are present and 2) establish field plots of PRG to quantify the increase of BYD incidence and BYDV diversity, determine if insecticide applications can reduce the prevalence and diversity of BYDV, and examine the relationship between BYD incidence and seed yield. A goal of the proposed work is to quantify the impacts of BYD in grass grown for seed in Eastern Oregon. Objectives: Objective 1. Characterize the genetic diversity of BYDV strains affecting susceptible perennial ryegrass (PRG) crops being grown for seed and nearby cereal crops to better understand which strain or set of strains result in disease. Objective 2. A) Establish field plots of PRG to quantify the increase of BYD incidence and BYDV diversity, B) determine if insecticide applications reduce the occurrence, accumulation, or diversity of BYDV, and C) examine the relationship between BYD incidence and seed yield.

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