Abstract
Plant extracts and streptomycin sulfate were evaluated against Xanthomonas axonopodis pv. citri. In first experiment, Azadirachta indica, Allium cepa, Catharanthus roseus, Allium sativum, Zingiber officinale (Roscoe) were investigated in vitro through inhibition zone technique against the growth of X. a. pv. citri. Results indicated that A. indica exhibited statistically significant inhibition (4 cm) zone over control. In second experiment, A. indica and streptomycin sulfate disjointedly and in amalgamation were evaluated in vitro. Streptomycin alone and in permutation with A. indica articulated significant inhibition of the bacterium. In third study, streptomycin sulfate and A. indica (S) and in combination were evaluated against citrus canker disease in green house. Results showed that streptomycin sulfate reduced disease significantly than control. In fourth experiment, streptomycin sulfate, A. indica, in combination and their interaction with days were evaluated under field condition. Streptomycin sulfate proved to be most effective and reduced the disease severity as compared to control.
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