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Q&A

Plant-Insect Ecosystems

Poster

P-IE: IPM - Horticultural Crops and Forestry

D3147: Improving vine mealybug (Planococcus ficus; Hemiptera: Pseudococcidae) control through adjuvant addition in major grape growing regions of California

Tuesday, November 2, 2021
9:00 AM – 6:30 PM MT
Location:: Exhibit Hall F
In-Person Poster

    Presenting Author(s)

  • JW

    Jacob A. Wenger

    Assistant Professor of Entomology
    California State University
    Fresno, California, United States

    • Co-Author(s)

  • TM

    Thomas Martin

    Junior Specialist
    Fresno State
    Clovis, California, United States

  • KD

    Kent Daane

    University of California
    Parlier, California, United States

The vine mealybug (Planococcus ficus) is one of the premier pests threatening the California grape industry. The systemic insecticide Movento (Bayer Crop Science) is an effective treatment against the vine mealybug. Movento's efficacy depends on the
conversion of its active ingredient, spirotetramat, to its enol form, spirotetramat-enol. The conversion occurs naturally in the leaf, so proper spray coverage and leaf uptake are crucial to ensure its effectiveness. The uptake and conversion of spirotetramat to spirotetramat-enol with the spray addition of different classes of adjuvants was determined with QuEChERS extraction technique and High-Performance Liquid Chromatography (HPLC) analysis of grapevine, Vitis vinifera, leaves. The study was replicated in prominent grape growing regions of California including: San Joaquin Valley, Northern Interior, North Coast, and Central Coast. Concentration of Spirotetramat-Enol was similar in all treatments, but varied in different locations in California. The results suggest that spray mixture spread is not a predictor of Movento efficacy, but other location-specific factors, such as humidity, temperature, and vine characteristics, may have the potential to influence efficacy of Movento® application.