Causal organism, symptoms, epidemiology, etiology, disease cycle and management of Fusarium Wilt of Chilli

1. Diseases of Vegetable and Spice Crops
(PTH 527)
Fusarium wilt
of
chilli
Plant Pathology

2. Causal organism : Fusarium oxysporium f. sp. capsici
Symptoms
The leaves turn yellow and wilt.
The chlorotic symptoms being to appear on one side of the
leaf
 Dropping of leaves which led to drying of leaves and
branches.
Browing of the vascular system can be seen in a cross
section of the lower stem or by removing lower stem and
roots.
At last it cause the death of plant.
Fusarium wilt of chilli

5.  Pathogen survival in soil.
 Temperature for the development is 28°C with 60 -70% humidity.
Etiology
Epidemiology
 Mycelium is hyaline and septate.
 Produce sporodochium.
 Produce two types of conidia.
 Macroconidia are hyaline , fusiform, mostly
3-6 septate, measure 25- 33 x 3.5 -5.5µm in
size and have gradually pointed and curved
ends.
 Microconidia are single cell , hyaline and
measure 6- 15 x 2.5 x 4 µm in size.
 Older mycelium forms chlamydospores which
are 1 or 2 celled, thick walled , round spore.
 Only chlamydospores can survive in the soil
for long.

6. Disease Cycle

7. Management
Field should be ploughed in summer and the soil should be allowed
to back in hot dry weather.
Long crop rotation (5-7 year).
Use of biological control like Trichoderma spp. ,Pseudomonas
fluorescens, Bacillus subtilis etc.
Use of wilt resistant varities Arka Lohit,Pusha Jwala, Jwahar 218
,and Pant C2.
Drenching with 1% Bordeaux mixture or Copper Oxychloride 50 %.
Seed treatment with Carbendazim 2gm/ kg.