symptoms,pathogen and management

1. STUDENT COURSE TEACHER
JANANI.V Dr. S. PARTHASARATHY
ID. No. 2016021015 Asst. Prof., (Plant Pathology)
COLLEGE OF AGRICULTURAL TECHNOLOGY
Affiliated to Tamil Nadu Agricultural University, Coimbatore
Kullapuram, Via Vaigai dam, Theni-625 562
NORTHERN AND SOUTHERN CORN LEAF BLIGHT

2. NORTHERN CORN LEAF BLIGHT
SIGNIFICANCE
• Northern corn leaf blight (NCLB) is a foliar
disease of corn (maize) caused by
Exserohilum turcicum.
• With its characteristic cigar-shaped lesions,
this disease can cause significant yield loss
in susceptible corn hybrids.
• The endemic areas of the disease identified
in India, which are Karnataka, Maharastra,
Andhra Pradesh, Bihar and Uttarkhand.

3. SIGNIFICANCE
• In dry weather, the disease rarely occurs or
does not spread enough to cause significant
economic damage.
• NLB development persisted at most in the
US and canada.
• As a result, NLB found at economically
significant levels in many areas.

4. ECONOMIC IMPORTANCE
• It is one of the important diseases affecting
photosynthesis with severe reduction of
grain yield to an extent of 28 to 91%
• India too, severe losses of 25–90% in
grain yield.to an extent of 28 to 91%.

5. GLOBAL DISTRIBUTION
WORLD:
Northeastern United States
Sub Saharan Africa
China
Latin America

6. DISTRIBUTION
INDIA:
Bihar
Lalmardi
Himachal Pradesh
Sikkim
Meghalaya
Tripura
Assam

7. SYMPTOMS OF NLB
• Early symptoms are oval, water-soaked
spots on leaves.
• Mature symptoms are characteristic cigar
shaped lesions that are 3 to 15cm long.
• Lesions are elliptical and tan in color,
developing distinct dark areas as they
mature that are associated with fungal
sporulation.

8. SYMPTOMS
• Lesions typically first appear on lower
leaves, spreading to upper leaves and the
ear sheaths as the crop matures.
• Under severe infection, lesions may
coalesce, blighting the entire leaf.

9. • @ @Pioneer.com

10. @@ Purdue Extension.com
lLong, Narrow lesions OOblong lesions

11. SYSTEMATIC POSITION
KINGDOM Fungi
PHYLUM Ascomycota
SUB PHYLUM Pezizomycotina
CLASS Dothideomycetes
SUB CLASS Dothideomycetidae
ORDER Pleosporales
FAMILY Pleosporaceae
GENUS Exserohilum
SPECIES turcicum
AUTHORITY K.J.Leonard & Suggs

12. PATHOGEN CHARACTERS
• In conidia germination, the fungus forms an
appresorium, which penetrates the corn leaf
cell directly using an infection hypha.
• The infection hypha produces infection pegs
to penerate the epidermal cell wall.