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United States Department of Agriculture

Agricultural Research Service

Research Project: Postharvest Treatments to Eliminate Invasive Pests of Concern to the California Table Grape Industry

Location: Commodity Protection and Quality

Project Number: 5302-43000-037-12
Project Type: Trust

Start Date: Jun 01, 2011
End Date: Apr 30, 2015

Objective:
Evaluate and develop postharvest treatments such as methyl bromide, CO2/SO2, phosphine, ozone, ultralow oxygen and cold treatments to eliminate invasive pests of concern to the California table grape industry that serve as trade barriers. The invasive pests of concern are spotted wing drosophila (SWD)(Drosophila suzukii), European grapevine moth (EVGM)(Lobesia botrana), and the newest invasive, the brown marmorated stink bug (BMSB)(Halyomorpha halys).

Approach:
This project is planned in phases as indicated below. Each phase will have its own goals and these goals will feed those of the following phase. Phase I. Maintain colonies of SWD at the USDA-ARS SJVASC in Parlier, CA with the throughput necessary to conduct fumigation studies. Phase II. Most tolerant life stage and dose/mortality – tests will be conducted to determine the most tolerant stage of invasive pest (eggs, larvae, pupae, and/or adults) towards a given treatment (fumigant or cold storage) by evaluating mortality over a range of treatment conditions (e.g., doses or temperatures). Establish and report dose-mortality regressions with statistical validity (Probit v. 2007 software). Phase III. Perform confirmatory fumigations in triplicate 9 1ft3 chambers with 10,000 specimens (most tolerant stage) while fruit is packed in export boxes recommended by industry. To ensure adequate exposure for complete mortality, fumigant concentrations will be measured throughout fumigations. Sorption and box effects on fumigation will be quantitatively analyzed. Phase IV. Identify any potential phytotoxicity to grape berries that occurs from exposure to fumigants at dosages that are efficacious for killing the most tolerant invasive pest life stage.

Last Modified: 9/10/2014
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