Study on antimicrobial effects of some medicinal plant extracts against some plant pathogenic bacteria
1997
Porntip Wongkaew | Supalak Hokawat | Wantana Sinsiri (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Crude extracts of Cassia alata (leaf), C. fistula (leaf) and Curcuma longa (rhizome) were evaluated against 3 plant pathogenic bacteria; Erwinia carotovora subsp. carotovora (Ecc), Pseudomonas solanacearum (Ps) and Xanthomonas campestris pv. vesicatoria (Xcv). Under laboratory condition, growth of all the 3 bacteria was completely inhibited by crude extract of C. longa with an ED50 about 30,000 ppm, which was effective as Cupravit for Ecc and Xcv, and was more effective than Cupravit for Ps. All the 3 bacteria were also suppressed by crude extracts of C. fistula and C. alata with an ED50 about 100,000 ppm, except for Ps which an ED50 value of C. alata was 300,000 ppm. The extraction solvents resulted similar effectiveness of the extracts.
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