This document summarizes several plant diseases that affect chili peppers, including their primary and secondary sources, causal organisms, symptoms, and management strategies. Pythium aphanidermatum causes damping off in chili seedlings from oospores in seeds or irrigation water. Colletotrichum capsici causes anthracnose from seed-borne or wind-borne spores. Leveillula taurica causes powdery mildew through crop debris. Xanthomonas vesicatoria causes bacterial leaf spot from seed-borne or rain-splashed sources. Chilli leaf curl virus and tomato mosaic virus cause leaf curling and mosaic symptoms transmitted by whiteflies and aphids, respectively. Management includes seed treatment,

1. AJMAL FAYIQUE C
ALB2008

2. Primary source : seed borne
oospores
Secondary source : irrigation
water
 Causal organism :
Pythium
aphanidermatum.
 Symptoms : pale green
seedling, brownish
water soaked lesion on
the basal portion of
stem, girdling of stem,
rot of tissue and
collapse of seedlings.

3. MANAGEMENT:
 Raising nursery in light soil with proper
drainage
 Rabbing – burning farm trash on the surface
of beds.
 Sowing seeds on raised beds.
 Seed treatment wuth Thiram or Captan @ 2-
3g per kg.
 Soil drenching with Bordeaux mixture 1% or
Copper oxychloride 0.3% or Metalaxyl 0.2%.

4. Primary source :
Seed borne
Secondary source :
Wind borne conidia
 Causal organism :
Colletrotrichium
capsici
 Symptoms : circular
sunken spots with
black margins on
fruits,premature fruit
drop.

5. Management:
 Seed treatment with Captan or Thiram 3-4g
per kg of seeds.
 Collect seeds from disease free plants.
 Removal and destruction of Solanaceous
weed hosts and infected plant debris.
 Spray three times Mancozeb @ 0.25% or
Captan 1.5% before flowering, at fruit
formation stage and 15 days after second
spray.

6. Primary source : crop debris
Secondary source :
conidia
 Causal organisms :
Leveillula taurica
 Small, circular whitish
spots.
 At later stages entire leaf
surface is with dirty white
growth.
 Management: Spray
wettable Sulphur 0.3% or
Dinocap or Carbendazim or
Tridemorph 0.1%

7. Primary source :
Seed borne
Secondary source :
Rain splashes
 Caused by
Xanthomonas
vesicatoria
 Small, irregular, black
greasy lesions
 Water soaked raised
spots with white halo.
 Scabby surface

8. MANAGEMENT:
 Collect seeds from healthy fruits.
 Seed treatment with Copper oxychloride 2g
per kg.
 Field sanitation
 Spray twice with Streptocycline 0.1g mixed
with Copper oxychloride 3g per litre of water
@ 15 days interval.

9. Transmission by >>>>>
White fly ( Bemisia
tabaci)
 Causal organism :
Chilly leaf curl virus.
 Rolling and crinkling of
the leaves.
 New leaves show
chlorosis and old
leaves become
weathery and brittle.
 Few fruits set that too
small.

10. Transmission by>>>>> Aphis gossypii, A.evonymi , Myzus
persicae
 Caused by TMV, CMV
 Stunting and poor
devolopment of plants.
 Mosaic mottling seen
 Abnormal shape of
leaves
 Marginal rolling.

11. MANAGEMENT:
 Collection of seeds from healthy fields.
 Seed treatment with Trisodium
orthophosphate 16% for 30 minutes followed
by washing with clean water.
 Roughing and destruction of infected plants
to remove foci of inoculum.
 Raising barrier crops to intercept aphid
vectors from neighbouring fields.
 Spray systemic insecticides to kill vectors.

12. ajmalfayique@gmail.com