1a. Objectives (from AD-416)
Objective 1: Determine the comparative efficacy of alternative chemicals to methyl bromide and develop methods that keep alternative fumigants as well as methyl bromide out of the atmosphere following postharvest fumigation. • Sub-objective 1.A. Determine efficacy, practicality, and product quality (phytotoxicity) of alternative fumigants such as phosphine, sulfuryl fluoride, propylene oxide, ozone, and others to control postharvest commodity pests. • Sub-objective 1.B. Determine the efficacy of sulfuryl fluoride as an alternative to methyl bromide for use in flour/rice mills by direct comparison in laboratory and field experiments. • Sub-objective 1.C. Test absorbent materials to find more efficient materials than coconut-based activated carbon to recapture methyl bromide and other fumigants. • Sub-objective 1.D. Develop stacking and airflow techniques to maximize the efficiency of capturing methyl bromide from airstreams following commodity fumigation. Objective 2: Electrophysiological and behavioral responses of pests to host compounds • Sub-objective 2.A. Cigarette beetle host attractant identification and behavioral evaluation. • Sub-objective 2.B. Navel Orangeworm host attractant identification and behavioral evaluation. Objective 3: Develop combination quarantine treatments for foreign and domestic hay exports including timothy, alfalfa, oat, Bermuda, and Sudan grass hays and rye straw that utilize hay harvesting and postharvest handling procedures, and apply chemical fumigants to minimize human exposure. Objective 4: Develop models to accurately predict damage to nuts by navel orangeworm and determine the feasibility, accuracy, and precision of these predictions. • Sub-objective 4.A. Develop models for damage in Nonpareil and pollenizer almonds in Kern County based on previous year’s damage, harvest date and/or sanitation efficacy and then determine if these models can be extended to the entire almond belt • Sub-objective 4.B. Determine if the methodologies or models developed for almonds can be used to predict navel orangeworm damage in pistachios • Sub-objective 4.C. Develop models for almonds relating navel orangeworm damage to males captured in pheromone traps within the same year
1b. Approach (from AD-416)
Develop alternative chemical controls and quarantine fumigations for stored product insects. Develop equipment and investigate the feasibility of controlling fumigant emission to the atmosphere by trapping and destruction. Develop combinations of fumigants with other technologies to reduce the dosage of fumigant required to control or eradicate stored product and quarantine insects in durable and perishable commodities. Develop non-chemical control approaches for stored product pests of commodities to reduce the use of methyl bromide. Develop methods to detect infestations by detecting volatile emissions from insects and/or commodity. Develop methods to enhance or maintain quality of perishable commodities and ensure that treatments developed do not reduce quality of persihable commodities or shorten shelf-life. Formerly 5302-43000-030-00D and 5302-43000-028-00D (12/07)
3. Progress Report
Hay harvesting and drying conditions were shown to increase the mortality of Hessian fly puparia in incubator tests that simulated climates where export quality hay is grown in the western states. Field drying tests were conducted to confirm these observations. Basic tests showed that Hessian fly puparia is controlled with a phosphine and carbon dioxide gas mixture dispensed from cylinders at a minimum dose of 750 ppm, temperature of 20°C or higher, and duration of 4 days. Data were collected documenting the relationship between poor sanitation in Butte and Padre variety almonds and overwintering survival of navel orangeworm in Madera county. Industry pistachio harvest data were collected for the Central Valley (approximately 35% of the harvest) so that the correlation between a multitude of factors including nut maturity, shell integrity and navel orangeworm damage could be established. Field trials were conducted establishing the duration of protection and ovicidal activity of the insecticides Assail, Warrior, Intrepid, Altacor and Permethrin. Significant progress was made in relating the number of navel orangeworm captured in traps to subsequent damage in almonds. Work continued on pheromone lure development for the navel orangeworm, and analyses procedures of pheromone compounds have been refined. New handling protocols reduce decomposition of labile compounds and are also employed in isolation of host volatiles. Volatiles from nuts can now be analyzed and assessed in bioassays; ovipositional and antennal bioassays are in use to isolate host components employed by navel orangeworm to locate their hosts. Separately, field trapping of navel orangeworm in female-baited traps show that saturation effects appear logarithmic as more males are trapped. Validation of sulfuryl fluoride as a methyl bromide alternative is now focused on finding an ovicidal "partner" for scenarios where insect control is required < 24h of harvest. Work on high-concentration low-temperature "Horn" phosphine is promising; stone fruit, table grape, and citrus industries are transitioning toward commercial use in California. Low-emission chamber fumigation development has been limited due to a staffing void that will be resolved in FY2011. Invasive species research is ongoing via USDA-APHIS collaboration.
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