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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 |
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| Institution: | 1. Univ Lyon, Université Claude Bernard Lyon1, CNRS, INRAE, VetAgro Sup, UMR Ecologie Microbienne, F 69622 Villeurbanne, France;2. Station d’Expérimentation Rhône-Alpes Information Légumes, SERAIL, 69126 Brindas, France;3. Department of Plant Pathology and Environmental Microbiology, The Pennsylvania State University, University Park, PA, USA;4. IRHS, INRAE, Agrocampus-Ouest, Université d’Angers, SFR 4207 QUASAV, 49071 Beaucouzé, France;1. School of Mechanical Engineering, Xihua University, 999 Jinzhou Road, Chengdu, Sichuan 610000, PR China;2. Citrus Research and Education Center, University of Florida IFAS, 700 Experiment Station Road, Lake Alfred, FL 33850, United States;3. Department of Biological Systems Engineering, University of Nebraska-Lincoln, 3605 Fair Street, Lincoln, NE 68583, United States;4. Department of Crop Protection, Institute for Sustainable Agriculture (IAS-CSIC), Cordoba, Spain |
| Abstract: | Soil application of systemic neonicotinoid insecticides for control of psyllid vectors of Huanglongbing disease on young citrus trees also produces season-long SAR control of citrus canker caused by Xanthomonas citri subsp. citri Schaad et al. The neonicotinoids imidacloprid (IMID) and thiamethoxam (THIA) were compared with soil or sprinkler applications of the commercial SAR inducer acibenzolar-S-methyl (ASM) and foliar sprays of copper hydroxide (CH) and/or streptomycin (STREP) 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 Southeast Florida. All treatments significantly reduced the 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. Sprinkler application of ASM was less effective than soil drench. The level of control for SAR treatments was comparable to eleven 21-day interval sprays of CH and/or STREP. SAR induced by soil-applied insecticides provides substantial benefits for canker disease management on young citrus trees that may be augmented with ASM. |
| Keywords: | Foliar disease control Integration of chemical inducers Neonicotinoid insecticides Systemic activity for disease control |
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