Evaluation of soil applied systemic acquired resistance inducers integrated with copper bactericide sprays for control of citrus canker on bearing grapefruit trees

2016 ◽  
Vol 90 ◽  
pp. 157-162 ◽  
Author(s):  
James H. Graham ◽  
Monty E. Myers
Keyword(s):  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Citrus Canker ◽  
Resistance Inducers

scholarly journals Soil Application of SAR Inducers Imidacloprid, Thiamethoxam, and Acibenzolar-S-Methyl for Citrus Canker Control in Young Grapefruit Trees

Plant Disease ◽  
2011 ◽  
Vol 95 (6) ◽  
pp. 725-728 ◽  
Author(s):  
James H. Graham ◽  
Monty E. Myers
Keyword(s):  
Untreated Control ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Citrus Canker ◽  
Tropical Storm ◽  
Storm Event ◽  
Copper Hydroxide ◽  
Foliar Disease ◽  
Average Rainfall ◽  
Rate Frequency

Soil applications of inducers of systemic acquired resistance (SAR) imidacloprid, thiamethoxam, or acibenzolar-S-methyl, at various rates and application frequencies, were evaluated for control of citrus canker caused by Xanthomonas citri subsp. citri in a field trial of 3- and 4-year-old ‘Ray Ruby’ grapefruit trees in southeastern Florida. Reduction of foliar incidence of canker produced by one, two, or four soil applications of imidacloprid, thiamethoxam, and acibenzolar-S-methyl was compared with 11 foliar sprays of copper hydroxide and streptomycin applied at 21-day intervals. In the 2008 and 2009 crop seasons, canker incidence on each set of vegetative flushes was assessed as the percentage of the total leaves with lesions. By the end of the 2008 season, despite above-average rainfall and a tropical storm event, all treatments significantly reduced foliar incidence of citrus canker on the combined spring-summer-fall flushes. Sprays of copper hydroxide and streptomycin were effective for reducing canker incidence on shoot flushes produced throughout the season compared with the untreated control, whereas soil-applied SAR inducers reduced foliar disease depending on rate, frequency, and timing of application. Except for the treatment of four applications of acibenzolar-S-methyl at 0.2 g a.i. per tree or two applications of imidacloprid, SAR inducers were ineffective for reducing foliar disease on the flushes that were present during the tropical storm. In 2009, all treatments significantly reduced the incidence of foliar canker on the combined spring-summer-fall flushes but not all treatments of spring-summer flushes with SAR inducers were effective compared with the untreated control. Hence, depending on rate, frequency, and timing of application, soil-applied SAR inducers reduced incidence of canker on foliar flushes of young grapefruit trees under epidemic conditions.

Efficacy of systemic acquired resistance inducers in olive leaf spot management

2012 ◽  
Vol 42 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Friday O. Obanor ◽  
Monika Walter ◽  
E. Eirian Jones ◽  
Marlene V. Jaspers
Keyword(s):  
Leaf Spot ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Olive Leaf ◽  
Resistance Inducers

scholarly journals Integration of Biological Control Agents and Systemic Acquired Resistance Inducers Against Bacterial Spot on Tomato

Plant Disease ◽  
2005 ◽  
Vol 89 (7) ◽  
pp. 712-716 ◽  
Author(s):  
A. Obradovic ◽  
J. B. Jones ◽  
M. T. Momol ◽  
S. M. Olson ◽  
L. E. Jackson ◽  
...  
Keyword(s):  
Plant Growth ◽  
Xanthomonas Campestris ◽  
Systemic Acquired Resistance ◽  
Leaf Surface ◽  
Acquired Resistance ◽  
Plant Growth Promoting Rhizobacteria ◽  
Bacterial Spot ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Resistance Inducers

Two strains of plant growth-promoting rhizobacteria, two systemic acquired resistance inducers (harpin and acibenzolar-S-methyl), host-specific unformulated bacteriophages, and two antagonistic bacteria were evaluated for control of tomato bacterial spot incited by Xanthomonas campestris pv. vesicatoria in greenhouse experiments. Untreated plants and plants treated with copper hydroxide were used as controls. The plant growth-promoting rhizobacteria or a tap water control were applied as a drench to the potting mix containing the seedlings, while the other treatments were applied to the foliage using a handheld sprayer. The plant growth-promoting rhizobacteria strains, when applied alone or in combination with other treatments, had no significant effect on bacterial spot intensity. Messenger and the antagonistic bacterial strains, when applied alone, had negligible effects on disease intensity. Unformulated phage or copper bactericide applications were inconsistent in performance under greenhouse conditions against bacterial spot. Although acibenzolar-S-methyl completely prevented occurrence of typical symptoms of the disease, necrotic spots typical of a hypersensitive reaction (HR) were observed on plants treated with acibenzolar-S-methyl alone. Electrolyte leakage and population dynamics experiments confirmed that acibenzolar-S-methyl-treated plants responded to inoculation by eliciting an HR. Application of bacteriophages in combination with acibenzolar-S-methyl suppressed a visible HR and provided excellent disease control. Although we were unable to quantify populations of the bacterium on the leaf surface, indirectly we determined that bacteriophages specific to the target bacterium reduced populations of a tomato race 3 strain of the pathogen on the leaf surface of acibenzolar-S-methyl-treated plants to levels that did not induce a visible HR. Integrated use of acibenzolar-S-methyl and phages may complement each other as an alternative management strategy against bacterial spot on tomato.

New ionic liquids based on systemic acquired resistance inducers combined with the phytotoxicity reducing cholinium cation

2018 ◽  
Vol 42 (14) ◽  
pp. 11984-11990 ◽  
Author(s):  
R. Kukawka ◽  
P. Czerwoniec ◽  
P. Lewandowski ◽  
H. Pospieszny ◽  
M. Smiglak
Keyword(s):  
Ionic Liquids ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Resistance Inducers

Systemic acquired resistance (SAR) is one of the most promising ways to support plants in the fight against viruses.

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