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

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. 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. • 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

17. Bacterial Ooze

18. 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

20. 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