In vitro Evaluation of Various Fungicides and Plant Extracts against Xanthomonas oryazae pv. oryzae Isolated from Rice (Oryza sativa L.)

Abstract

The bacterial leaf blight of rice caused by Xanthomonas oryazae pv. oryzae is the disease of great economics importance in India especially in Bihar. Management of BLB disease can play a vital role in management of rice disease. In the present investigation evolution of different plant extract (botanical) and new chem. on growth of bacteria by poison food technique and sowing by best botanical and new chem. were conducted and antagonistic activity were tested. Three botanical and three new chem. were screened in-vitro for antagonistic activity agent BLB. Among six tested botanical and new chem. isolated again Xanthomonas oryazae pv. oryzae, The aqueous leaf extract of botanicals were effective i.e. Allium sativum, Azadirachta indica and Zingiber officinale were found to be antagonistic towards Xanthomonas oryzae pv.oryzae @ 15% concentrate after 48 h. Three chems. found effective in reducing severity of BLB were Blitox- 50+Streptocycline, Ergon 44.3 SC and Nativo 75WG @50 ppm concentrate showed inhibition colony width growth of pathogen by poisons food technique resp. The seed treatment with six effective i.e. three botanical and three new chem. provide good protection of seed against seed borne pathogen resulting increase seed germination and seedling vigor of rice variety as compare to control.