If you have got had issues with bacterial blight, you will need to use a mixture of copper and mancozeb-containing fungicides for management. Avoid overhead watering that may keep leaves wet. Properly fertilize, water and mulch shrubs to avoid stress which will dispose them to sickness. These irregularly shaped spots square measure featheredged by a gamboge ring, that is a diagnostic symptom of common bacterial blight. As these spots enlarge, the tissue within the center dies and turns brown. Symptoms of common bacterial blight first appear on leaves as tiny, water-soaked spots, light-weight inexperienced areas, or both. In severe epidemics crop loss is also as high as seventy five %, and numerous hectares of rice are infected annually. Deadly bacterial disease that is among the foremost damaging afflictions of cultivated rice (Oryza sativa and O. (2000) warned that.A disease of rice caused by the plant life Pyricularia oryae, characterised by elliptical leaf spots with achromatic margins, brown lesions and neck rot of the mature panicles, and stunt flying of the plant Rice microorganism blight, additionally called bacterial blight of rice. Akhtar and Akram (1987) observed the disease at all the 10 locations tested for the disease. During traveling seminar in 1985 its incidence was reported as 10-15, 15-20, 20-25% in Sindh, Punjab and KP respectively (Akhtar and Sarwar, 1986). Later, Ahmad and Majid (1980) observed it on rice varieties IR 6, Palman, Basmati-198 at Rice Research Institute, Kala Shah Kaku and farmer's field. The disease was first reported in Pakistan by Mew and Majid (1977). However, during 1960's, the disease became common in Asian rice growing regions due to use of TN1 and IR8 which proved to be susceptible to the disease (Amna, 2008). In India losses were 6-60% or even upto 81% in some cultivars (Srivastava, 1967 Ahmad and Singh, 1975). It's a serious threat to rice crop in South East Asia with particular reference to Japan causing 20-30% losses, occasionally rising upto 50% and even higher losses in Indonesia and Philippines. Further it is reported in Australia, Caribbean region, North America, Latin America, Malaysia, West Africa, Mali, Niger and Senegal, however no evidences exist from Europe except USSR (Anonymous, 1986). The disease progressed further and is reported in many rice growing countries like China, Korea, Thailand, Philippines, India and Srilanka (Tasleem et al., 2000). However, during 1910 -11, it was prevailing from central to southwestern Japan (Tagami and Mizukami, 1962). The disease was first noted by farmers of Fukuoka areas in Japan during 1884. oryzae [Ex Ishiyama, 1922 (Swings et al., 1990) is a major constraint for rice production in rainfed, irrigated environments and tropical rice growing areas (Mew, 1987). 28(4): 565-569īacterial blight of rice caused by Xanthomonas oryzae pv. Screening of local rice germplasm against bacterial leaf blight caused by Xanthomonas Oryzae PV.
oryzae, Screening, EvaluationĬitation: Shehzad, F.D., Farhatullah, N.
Key words: Rice, Bacterial leaf blight, Xanthomonas oryzae pv. It is suggested that a detailed analysis of both rice germplasm and BLB isolates should be conducted to exploit the host-parasite relationship in an efficient manner.Īlso, identification of resistant rice germplasm across the country against bacterial leaf blight isolates is still uncovered. For PGRI lines, disease incidence ranged from 57.9% (PGRI-43) to 85% (PGRI-50). In Basmati varieties, varietal response ranged from moderately resistant for Kashmir Basmati (7.5%) to highly susceptible for Super Basmati (88.4%). However, some of the local commercial varieties showed moderate resistance. None of the basmati or advanced lines was observed as resistant. Disease symptoms appeared after five days of inoculation. The inoculum concentration was adjusted to 108CFU/ml. Artificial inoculation using clipping method was carried out in distilled water after a constant shaking at 37oC for 72 hrs. Twenty commercial varieties/advanced lines alongwith control (Super Basmati and IR 24) were screened against bacterial leaf blight under inoculated conditions in the rice fields of Nuclear Institute for Agriculture and Biology, Faisalabad. Byline: FAZL I DAYIM SHEHZAD, FARHATULLAH, NAYYER.
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