BACTERIAL BLIGHT
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Bacterial leaf blight is a disease of rice caused by the bacterium Xanthomonas oryzae pv. oryzae. It was first identified in Japan in 1884. The disease causes wilting and death of rice seedlings within 3-4 weeks of transplanting. It enters through natural openings or wounds in the leaf. Lesions form on the leaves and turn yellow. Dew drops containing bacterial masses form on young lesions. The bacterium can be transmitted by irrigation water, rain, plant contact, or contaminated tools. Warm temperatures between 25-30 degrees Celsius and heavy rain or flooding create favorable conditions for the disease. Management strategies include growing resistant varieties, destroying infected plant debris, avoiding wounding of seedlings
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![BACTERIAL LEAF BLIGHT
• CASUAL ORGANISM : Xanthomonas oryzae pv. oryzae
• Telugu name : bacteria aaku endu tegulu
• First identified in japan 1884 [Indonesia]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Phytophthora blight of pigeonpea is caused by the soil-borne fungus Phytophthora drechsleri f. sp. Cajani. It was first reported in India in 1966 and causes leaf lesions, stem cankers, and plant death, resulting in potential yield losses of 5-10%. The disease is favored by warm, humid conditions with heavy rainfall and affects pigeonpea plants at any growth stage. Management strategies include crop rotation, drainage improvement, resistant varieties, and fungicide seed treatments or foliar applications.
Phytophthora Blight of Pigeonpea-1.pptx
Phytophthora blight of pigeonpea is caused by the soil-borne fungus Phytophthora drechsleri f.sp. cajani. It affects pigeonpea plants at any growth stage, causing leaf lesions, stem cankers, and plant death. Warm, humid conditions with heavy rainfall favor disease development. Management strategies include growing resistant varieties, improving drainage, applying fungicides, and incorporating non-host crops in crop rotations.
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This document provides information on major diseases that affect sesame crops and their management. It discusses 7 key diseases: phyllody caused by phytoplasma and transmitted by leafhoppers, stem and root rot caused by Macrophomina phaseolina fungus, Cercospora leaf spot caused by Cercospora sesami fungus, powdery mildew caused by Erysiphae cichoracearum fungus, Alternaria leaf spot caused by Alternaria sesami fungus, bacterial blight caused by Xanthomonas compestris pv. sesami bacteria, and bacterial leaf spot caused by Pseudomonas syringe pv sesame bacteria. For each disease, it describes symptoms, etiology, disease
POTATO diseases 2020.pptx
This summarizes potato late blight, bacterial wilt in brinjal, and their management. Potato late blight causes black/brown leaf and stem lesions that expand rapidly. It is caused by the oomycete Phytophthora infestans which produces spores in humid conditions. Management includes planting certified seed, fungicide treatment, proper irrigation, and discarding infected tubers. Bacterial wilt of brinjal is caused by Ralstonia solanacearum soil bacterium. It has a wide host range and survives long-term in soil and weeds. Symptoms include wilting and vascular discoloration. Management involves crop rotation, resistant varieties, reducing moisture, and biological controls
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BACTERIAL BLIGHT
- 2. BACTERIAL LEAF BLIGHT • CASUAL ORGANISM : Xanthomonas oryzae pv. oryzae • Telugu name : bacteria aaku endu tegulu • First identified in japan 1884 [Indonesia]
- 3. SYMPTOMS AND SIGNS • Wilting of plants . Wilt syndrome known as Kresek is seen in seedlings within 3-4 weeks after transplanting of the crop. • The bacterium enters through the hydathodes and cut wounds in leaf tips, and cause death of entire seedling. • The lesions enlarge both in width and length with a wavy margin and turn straw yellow within few days. • Milky dew drops containing bacterial masses are formed on young lesions in the morning.
- 4. DISEASE CYCLE • INOCULUM : Inoculum present in rice stubble and weed hosts. • The pathogen may be present for a short time on infected seed and soil. • TRANSMISSION : The bacterium spreads by irrigation water, rain, plant to plant contact, and tools for transplanting seedlings. • INFECTION : The bacterium enters leaf tissues through natural openings such as hydathodes and stomata on leaf blades , wounds on leaves and roots. Some bacteria invade the vascular system and may ooze from hydathodes. • PRIMARY INFECTION : through seeds.
- 5. FAVOURABLE CONDITIONS • Clipping of tip of the seedling at the time of transplanting. • Heavy rain. • Heavy dew. • Flooding. • Deep irrigation water. • Severe wind. • Temperature of 25-30 degrees. • Application of nitrogen.
- 6. MANAGEMENT • Grow resistant cultivars like MTU 9992,Swarna,Ajaya,etc. • Affected stubbles are to be destroyed by burning or through ploughing. • Judicious use of nitrogenous fertilizer. • Avoid clipping of tip of the seedlings at the time of transplanting. • Avoid flow of irrigation water from infected to healthy field. • Spray psuedomonas florescens at 1kg per acre with 200lt of water. • Application of bleaching powder@ 2kg/acre in the irrigation water at kresek stage {>60 DAT}. • Soak seeds with Agromycin followed by hot water treatment and spray streptomycin 250ppm
Editor's Notes
- BACTER