In-vitro Screening of Plant Extract to Control Bacterial Leaf Blight of Rice Disease Caused by Xanthomonas oryzae pv oryzae

摘要

The antibacterial potential of various plant extracts as alternative to chemical pesticides for controlling bacterial leaf blight of rice was investigated. Ten different species of plants were collected from surrounding of RAU, Pusa (Bihar). Three concentrations of plant extracts 5,10 and 15% were used to test the antibacterial activity of plant extract by using poison food technique and were used as seed treatment to know the enhancement of seed germination and seedling vigor. All the ten plant extracts were found to inhibit the growth of Xanthomonas oryzae pv oryzae, in-vitro, at all three concentrations as compared to control. When compared with standard check, streptomycin sulfate (100 ppm), Ocimum tenuiflorum and Calotropis procera were at parat 5% concentrations of plant extracts, whereas at 10% concentration Ocimum tenuiflorum, Calendula officinalis, Zingiber officinale and Allium sativum were highly effective and at par among themselves and at 15% concentrations, Calendula officinalis, Zingiber officinale, Allium sativum, Ocimum tenuiflorum showed promising effect or at par with streptomycin sulfate (100 ppm). All the plant extracts increased seed germination and seedling vigor of ricevarieties as compared to control except Allium cepa.