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Studies on bacterial canker of kagzi lime (Citrus aurantiifolia) caused by xanthomonas axonopodis pv. citri (Hasse) in Marathwada region
| Content Provider | KrishiKosh-Indian National Agricultural Research System |
|---|---|
| Advisor | Dandnaik, B. P. |
| Researcher | Jadhav, Rajnikant Ramakant |
| Abstract | Bacterial canker of Kgzi lime (Xanthomonas axonopodis pv. citri) is one of the serious disease of citrus growing regions. Present investigations on the disease (X. axonopodis pv. citri) were carried out during 2015-16 to fulfill the objectives defined, at the Department of Plant Pathology, College of Agriculture, Latur. The test bacterium was successfully isolated on Nutrient Agar (NA) media and its pathogenicity was proved by spray inoculation method in earthen pots under screen house conditions on Kagzi lime seedlings. Survey conducted on bacterial canker on Kagzi lime orchards in terms of disease incidence and disease severity among the Latur, Beed and Osmanabad districts reveled that, highest average incidence and severity (41.00 and 25.51) found in Osmanabad tahsil followed by Tuljapur (38.33 and 23.62) and Chakur (31.18 and 20.85) tahsil. However, lowest average incidence and severity found in Nilanga and Omaarga tahsil. i.e (00.0 and 0.00). Of various cultural characteristics viz., colony color and colony shape, colony margin and elevation of X. axonopodis pv. citri studio!, all isolates showed similar results. The studies on biochemical characteristics of X. axonopodis pv. citri showed positive reactions for potassium hydroxide (KOH) solubility test, catalase test, starch hydrolysis test,; whereas, gram reaction as negative. All the antibiotics and fungicides tested in vitro were found effective against X. axonopodis pv. citri. Among antibiotics tested, significantly highest average inhibition zone was obtained with streptocycline (21.24mm), followed by plantomycin (15.61 mm) and 2-bromo-2 nitro propane 1,3-diol (14.99 mm). Among fungicides tested, xiv significantly highest average inhibition zone was obtained with mancozeb (18.64 mm), Bordeaux mixture (15.14 mm) followed by copper oxychloride (14.02 mm), and cymoxanil + mancozeb (13.93 mm). All the 9 botanicals tested were found bacteriostatic against X. axonopodis pv. citri and average inhibition zone recorded was ranged from 6.83 mm (P. hysterophorus) to 11.83 mm (Z. officinale), respectively. However, it was significantly highest with Z. officinale (11.83 mm), followed by A. indica (11.62 mm), A. sativum (10.95 mm ), O. sanctum (09.25 mm) and A squimosa (8.92 mm) respectively. The result of the integrated bacterial canker disease management in Kagzi lime (pot culture) revealed that all the treatments attempted showed significantly reduction of average incidence, over untreated control. Mean per cent disease control (PDC) achieved with all the treatment ranged from 17.45 to 52.59 per cent. However highest mean disease control of 52.69 was recorded with streptocycline followed by Mancozeb (48.40), Plantomycin (41059), Bordeaux mixture(38.25), Cyamoxanil+ Mancozeb (36.75), 2-Bromo-2 Nitro propane-1,3-diol (33.49), Z. officinale (32.86)^4. sativum (28.66). The lowest per cent disease control was achieved with A. indica i.e.(17.45). However all the treatments attempted showed significantly reduction of average imtensity, over untreated control. Mean per cent disease control (PDC) achieved with all the treatment ranged from 27.42 to 52.42 per cent. However highest mean disease control of 52.42 was recorded with streptocycline followed by Mancozeb (47.05), Plantomycin (45.64), Bordeaux mixture(44.64), Cyamoxanil+Mancozeb (41.71), 2- Bromo-2 Nitro propane-1,3-diol (38.28), Z. officinale^34.76), A. sativum(30.05). The lowest per cent disease control was achieved with A indica i.e (27.42). Thus, it is concluded that Xanthomonas axonopodis pv. citri can be managed effectively with integration of various antibacterial chemicals, and botanicals. |
| Page Count | 126 |
| File Size | 6987066 |
| File Format | |
| Language | English |
| Publisher | Vasantrao Naik Marathwada Krishi Vidyapeeth |
| Publisher Place | Parbhani |
| Access Restriction | Open |
| Subject Keyword | Pathogenecity Canker Antibiotics Fungicides Botanicals Plant Pathology Agriculture |
| Content Type | Text |
| Educational Degree | Master of Science (M.Sc.) |
| Resource Type | Thesis |
