bacterial leaf spots in chilli

1. Chilli leaf spots
By- almaszabeen badekhan
UGS11AGR5590

2. Bacterial leaf spot
• It was first observed in the U.S.A. in 1912. It is
the most common of the bacterial diseases of
chilli in India.
• This is a widespread disease.

3. Symptoms:
•The leaves exhibit small, circular or
irregular, dark brown or black greasy
spots. As the spots enlarge in size,
the centre becomes lighter
surrounded by a dark band of tissue.
•The spots coalesce to form irregular
lesions. Severely affected leaves
become chlorotic and fall off. Petioles
and stems are also affected.
•On the fruits, round, raised water
soaked spots with a pale yellow
border are produced.
Brown or Black greasy spots
on leaves

4. Brown spots on fruits
Wart-like, dark brown spots on the fruit Symptoms on the peduncle

5. • Casual organism-
Xanthomonas campestris pv
vesiccatoria.
• Kingdom-Bacteria
• Phylum-Proteobacteria
• Class-Gamma proteobacteria
• Order-Xanthomonodales
• Family-Xanthomonodaceace
• Genus-Xanthomonas
Gram negative,rod
shape,aerobic,single polar
flagella.

6. Chilli Cercospora leaf spot
• The leaf spot disease is seen both in nursery
and main field
• The disease causes loss due to defoliation and
reduction in photosynthesis.

7. symptoms
• The disease first manifests as
small brownish spots on the
leaves as well as on stem and
gradually develops into the big
circular grayish spots with
whitish center.
• Later they form into large
lesions due to coalescing of
the spots.
• Infection on fruit stalk and
calyx is also very common in
severe cases grayish spots with whitish center

8. Initially Brownish spots with yellow
margin
Brownish spots with whitish center
Coalescing of spots Necrosis of leaves

9. • Causal organism:
Cercospora capsici
• Family :
Dematiaceae
• Order: Moniliales
• Class: Hyphomycetes
• Sub.Division:
Deuteromycotina
Cercospora conidia

10. Alternairia leaf spot
• The infection causes large spots on the leaves
often starting form the leaf margins and
results in blighting of infected leaves and
ultimately defoliation. The fungus also causes
fruit rot in the form of irregular spots often
starting from the fruit tip.

12. • Causal organism- Alternaria
solani
• Kingdom –Fungi
• Phylum –Ascomycota
• Sub phylum-Pezizomycotina
• Class-Dothideomycetes
• Sub class-Pleosporomycetidae
• Order-Pleosporales
• Family-Pleosporaceae
• Genus-Alternaria
Conidia are large,dark and
multicellular with both
transverse and longitudinal
cross walls (muriform)
conidia