Abstract
The objective of present study was to evaluate the effect of copper hydroxide and flare at three concentrations (0.1, 0.2 and 1%) and naphthalene acetic acid, salicylic acid, copper hydroxide alone and in combination (Flare + salicylic acid) at 0.75, 1 and 1.5% concentration against Xanthomonas axonopodis pv. citri in lab and greenhouse conditions respectively. Results showed that in lab condition maximum inhibition of bacterial growth was expressed by combination of flare and copper hydroxide, followed by Flare, copper hydroxide over control while in case of greenhouse experiment minimum disease incidence was expressed by combination of Flare + salicylic acid after 5, 10 and 15 days interval followed by flare, salicylic acid, naphthalene acetic acid and Cu(OH)2 as compared to control.
Highlights
Asiatic citrus canker caused by Xanthomonas axonopodis pv. citri (Xac) is the most destructive disease of citrus cultivars all over the world [14]
Induced resistance in plant cells is related with several defense responses like formation of pathogenesis-related proteins [2, 9, 12], alterations in physiology and biochemistry of cell wall [20, 24], production of reactive oxygen species (ROS), variations in activities of enzymes during oxidative stress [11, 23] and generation of phenylalanine ammonia-lyase (PAL) which is the fundamental enzyme of phenylpropanoid pathway [4, 23]
Maximum inhibition zone was expressed by combination of Flare and Copper hydroxide (5.02) followed by Flare (4.23) and copper hydroxide (3.781) cm as compared to control (Table.1 & Figure 1)
Summary
Asiatic citrus canker caused by Xanthomonas axonopodis pv. citri (Xac) is the most destructive disease of citrus cultivars all over the world [14]. It is difficult to develop the most suitable and effective alternative of these compounds but a days different biological and synthetic compounds having ability to manage numerous plant diseases without having any direct antibiotic effect are being used [10] for induction of resistance in citrus germplasm against Xac. Induced resistance in plant cells is related with several defense responses like formation of pathogenesis-related proteins [2, 9, 12], alterations in physiology and biochemistry of cell wall [20, 24], production of reactive oxygen species (ROS), variations in activities of enzymes during oxidative stress [11, 23] and generation of phenylalanine ammonia-lyase (PAL) which is the fundamental enzyme of phenylpropanoid pathway [4, 23]. Advances in Zoology and Botany 6(1): 26-30, 2018 and plant activators alone and in combination against citrus In-vitro Evaluation of Chemicals against Xanthomonas canker disease
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