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Citrus canker

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Canker is an important disease of Citrus .The PPT discussed symptoms, pathogen and management methods of this disease.

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Citrus canker

  1. 1. CITRUS CANKER DR. RAJBIR SINGH Assistant Professor Department of Plant Pathology Gochar Mahavidyalaya, Rampur Maniharan, Saharanpur (UP), India Affiliated to Ch. Charan Singh University, Meerut (UP), India Email: rajbir25805@yahoo.com, rajbirsingh2810@gmail.com Cell No. 91-9456613374
  2. 2. Citrus Canker • All citrus growing areas of India & world • Epidemic in USA • Infect all citrus spp. plants Symptoms: • Firstly symptoms on lower side &later on both side of leaves • Attack on leaves, twig, petiole, branches, fruit, thrones • Small, round, watery, translucent raised, yellow brown spots on leaves & old branches
  3. 3. • Spots – white to greenish & finally rapture –rough corky • Rough lesions surrounded by–yellow brown to green raised margin & watery yellow halo • Crater like appearance is more common than leaves • Fruit lesion become rough & corky • Lesion confined only skin • Defoliation • Less price of fruits due to braking of skin • Disease – whole the year but more spared in rainy season
  4. 4. Bacterial Ooze
  5. 5. Pathogen – Xanthomonas axonopodis pv.citri • Survive – cankered lesion on twig & branches • Pathogen multiply intercellular (middle lema) & enter through stomata & wounds • Dissolve the mid lamella & establish in cortex • Citrus leaf minor – disseminate the disease • High humidity • Temp. 20-30° C
  6. 6. Disease Management • Grow disease free stock in nursery • Before planting – spray the area with 1% B. M. (5: 5: 50) • Pruning & burn them before on set of monsoon & spray 1% B.M. during rainy season • Balance fertilizers & irrigation • Neem cake @ 160 Q/ha. to control disease & leaf minor • Spray–Streptomycen sulphate @500 ppm at 15 days interval • Dis. Res. Var. of Kagji Nimbu – SN-2, Sankar–3, Sankar-4

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