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ViewAttendees 3

Section Symposium

Physiology, Biochemistry, and Toxicology

Basic and Applied Chemical Ecology in Cerambycid Beetles

Assessment of release rate over time of individual compounds from a mixture of 10 semiochemicals applied to a cotton wick and held in a plastic bag

Sunday, November 5, 2023
10:55 AM – 11:10 AM ET
Location: Gaylord National Resort & Convention Center, Maryland 1-2
In-Person

    Presenting Author(s)

  • BS

    Bob Setter

    Synergy Semiochemicals Corporation
    Delta, British Columbia, Canada

    • Co-author(s)

  • TO

    Tom O'Loughlin

    Synergy Semiochemicals Corporation
    Delta, British Columbia, Canada

  • MF

    Mike Fraser

    Synergy Semiochemicals Corporation
    Delta, British Columbia, Canada

  • PC

    Peter Corbett

    Synergy Semiochemicals Corporation
    Delta, British Columbia, Canada

  • AR

    Alain Roques

    INRAE
    Ardon, Centre, France

  • BS

    Bob Setter

    Synergy Semiochemicals Corporation
    Delta, British Columbia, Canada

When releasing semiochemicals in the field for use against insect populations individual release devices allow the best control of release rate over time. The compound being released can be paired with plastics appropriate for controlled release over longer periods extending from 60-120 days, depending upon the moiety and temperature. But when 5 or 10 compounds are required single release devices for each compound can quickly become unaffordable. In these circumstances, researchers commonly make a cocktail of compounds and release it from a single device. While a pooled approach can be cost effective, control over release rates of each compound is compromised. The relative ratio between compounds in the pool will also change over time if the compounds have different chemical properties, dependant upon how they react with each other in the mix and the interface of the controlled release membrane or substrate. Releasing a mixture of compounds should result in a constantly changing ratio in the blend of compounds released over time. Here we will assess a mixture of 10 compounds pooled into isopropanol solvent released from a cotton wick that is held in a polyethylene bag. Gravimetric measurements will be taken from formulated release devices at regular intervals over time. This will be coupled with GC mas spec of the remaining contents at the time of each gravimetric assessment. By assessing the weight loss and contents at each time point, we should be able to extrapolate the change in the ratios of each compound in the mixture.