Lack of Control of Citrus Canker by Induced Systemic Resistance Compounds

Plant Disease
James H Graham, R P Leite

Abstract

Induced systemic resistance compounds (ISRs), acibenzolar-S-methyl (Actigard), and harpin protein (Messenger) were assayed in the greenhouse against Xanthomonas axonopodis pv. citrumelo, the cause of citrus bacterial spot (CBS), and X. axonopodis pv. citri, the cause of Asiatic citrus canker. Actigard and Messenger applied as foliar sprays 3 to 7 days before inoculation reduced numbers of lesions when either bacterium at 103 or 104 CFU/ml was injection-infiltrated into Swingle citrumelo leaves. Based on this activity, the ISRs were evaluated in southern Brazil in orchards of sweet oranges with low to moderate canker disease incidence in spray programs with and without copper oxychloride (COC) and copper hydroxide (CuOH). Actigard and Messenger were applied full season or in the first two or three sprays of a six-spray program in an attempt to reduce early canker disease on foliage and thereby reduce subsequent fruit infection and premature drop. Sprays of COC and CuOH were moderately to highly effective in reducing canker disease incidence and preventing premature fruit drop. Actigard or Messenger in combination with COC and CuOH, respectively, did not significantly reduce citrus canker incidence on foliage or fruit drop compar...Continue Reading

Citations

Jun 20, 2019·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Michael GlueckKristjan Plaetzer
Oct 26, 2018·Frontiers in Plant Science·Fernando M AlferezZhonglin Mou
Mar 28, 2007·Annual Review of Phytopathology·J B JonesM T Momol
Feb 7, 2013·Journal of Experimental Botany·Dale R WaltersNeil D Havis
Feb 24, 2016·Frontiers in Microbiology·Admilton G de OliveiraGaldino Andrade
Apr 13, 2018·Phytopathology·Nadia RieraNian Wang
Aug 9, 2018·Frontiers in Plant Science·Nadia R ChalfounAtilio P Castagnaro
Mar 28, 2013·Bacteriophage·Jeffrey B JonesM Timur Momol

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