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