Source: WASHINGTON STATE UNIVERSITY submitted to NRP
WHAT IS OLD IS NEW AGAIN: EFFECTS OF UV-C GERMICIDAL LIGHT, AND SULFUR, ON POWDERY MILDEW MANAGEMENT
Sponsoring Institution
Agricultural Research Service/USDA
Project Status
ACTIVE
Funding Source
USDA CONTRACT
Reporting Frequency
Annual
Accession No.
0447020
Grant No.
(N/A)
Cumulative Award Amt.
(N/A)
Proposal No.
(N/A)
Multistate No.
(N/A)
Project Start Date
May 1, 2024
Project End Date
Oct 31, 2025
Grant Year
(N/A)
Program Code
[(N/A)]- (N/A)
Recipient Organization
WASHINGTON STATE UNIVERSITY
(N/A)
PROSSER,WA 99350
Performing Department
(N/A)
Non Technical Summary
(N/A)
Animal Health Component
25%
Research Effort Categories
Basic
75%
Applied
25%
Developmental
0%
Classification

Knowledge Area (KA)Subject of Investigation (SOI)Field of Science (FOS)Percent
21211311160100%
Knowledge Area
212 - Pathogens and Nematodes Affecting Plants;

Subject Of Investigation
1131 - Wine grapes;

Field Of Science
1160 - Pathology;
Goals / Objectives
1. The role of canopy management in UV-C based grape powdery mildew management programs. 2. Understanding fungicide phytotoxicity in wine grapes â¿¿ The role of sulfur concentration, adjuvants, and the environment.
Project Methods
We will refine and adapt field-based UV-C light applications for the control of grape powdery mildew to optimize a low-chemical input disease management regime for arid grape production regions such as eastern Washington and eastern Oregon, as well as Idaho. Specifically, we will explore how canopy management impacts UV-C light efficacy when applied during the critical window for berry infection (immediate pre-bloom to 4 wks post full bloom). Summer ⿿sulfur burn⿝ is a common concern in wine grape production. It stems from a fear that grapevine foliage and fruit can experience severe phytotoxic burns if sulfur is sprayed during, or just before, periods of high temperatures. This objective will attempt to define what components of a mid-summer sulfur spray ⿿ sulfur concentration, sulfur formulation, adjuvant, and environmental conditions ⿿ are truly driving the risk of phytotoxicity. The resulting information will be used to update spray recommendations and alleviate potential fears associated with mid-summer fungicide treatments.