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United States Department of Agriculture

Agricultural Research Service

Research Project: Circumventing Ovicidal Deficiencies of Sulfuryl Fluoride and other Postharvest Fumigants Project Number: 5302-43000-037-15
Project Type: Reimbursable

Start Date: Feb 17, 2012
End Date: Feb 16, 2013

Objective:
Objectives of the research are: 1) Establish species-specific efficacies for the Sulfuryl fluoride-propylene oxide mixture at molar ratios that are technically and economically the most feasible over temperature 40-80 F. 2) Quantify the antimicrobial activity of SF-PPO mixture toward pathogens, including salmonella. 3) Determine chemical residues associated with ovicide-SF pairings, particularly those resulting from the PPO-SF mixture. Tailor fumigant-ovicide application to minimize residue formation, as well as, adapt novel residue remediation technologies (e.g. ozone-ethane fumigation) to break PPO-related trade barriers for the walnut industry. 4) Develop novel chemical and physical approaches to kill insect eggs based on an understanding of egg biochemistry and/or the logistical operations of walnut harvest and distribution.

Approach:
Objective 1. The LD 50 of sulfuryl fluoride will be determined at 60 - 80 F for the eggs of dried fruit beetle and warehouse beetle. Objective 2. To facilitate the detection of biomolecular conjugates, mass-labeled propylene oxide will be synthesized via the method of Beckman. The mass-labeled PPO will then be used to fumigate inshell walnuts; a mass balance will be generated. Mass-labeled residues that are likely to be formed during walnut fumigations will be characterized in studies on surrogate biomolecules such as: oleic acid, bovine serum albumen, and glutathione. Objective 3. We will then expose eggs to fumigants, ovicides, and other physiologically active gases to observe any morphological change that results. Once mechanistic details are gathered, we will tailor chemical and physical approaches to exploit weakness in egg shells. Approaches will only be explored that are amenable to existing infrastructure of the walnut industry.

Last Modified: 10/24/2014
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