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Integration of soil-applied neonicotinoid insecticides and acibenzolar-S-methyl for systemic acquired resistance (SAR) control of citrus canker on young citrus trees.
J. H. GRAHAM (1), M. E. Myers (1). (1) University of Florida, Lake Alfred, FL, U.S.A.

Soil application of systemic neonicotinoid insecticides for control of psyllid vectors of Huanglongbing disease on young citrus trees also produce season-long SAR control of citrus canker caused by <i>Xanthomonas citri</i> subsp. <i>citri</i>. Neonicotinoids, imidacloprid (IMID; Admire, Bayer) and thiamethoxam (THIA; Platinum, Syngenta), were compared with soil or microsprinkler applications of the commercial SAR inducer acibenzolar-S-methyl (ASM; Actigard, Syngenta) and foliar sprays of copper hydroxide (CH; Kocide 3000, Dupont) or streptomycin (STREP; FireWall, Agrosource) to evaluate their effects on the percentage of canker-infected leaves on 2 yr-old Vernia orange and 3 yr-old ‘Ray Ruby’ grapefruit trees in Ft. Pierce, FL. All treatments significantly reduced incidence of foliar canker compared to the untreated check. Soil drenches of ASM and season long rotations with IMID and THIA were highly effective for suppressing foliar canker on young grapefruit and orange trees under weather conditions absent of high intensity rains or tropical storms. Microsprinkler application of ASM was less effective than soil drench. The level of control for SAR treatments was comparable to eleven 21-da interval sprays of CH or STREP. SAR induced by soil-applied insecticides provides substantial benefits for canker disease management that can be augmented with ASM.<p><p>Keywords: Bacteria-Phytoplasma-Spiroplasma-Fastidious Prokaryote, Fruits-Nuts, Citrus

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