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

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

• 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

Bacterial Ooze

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

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