Fusarium wilt of chilli

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 : Fusariumoxysporiumf. sp. capsici
Symptoms
The leaves turn yellowand wilt.
The chloroticsymptoms being to appear on one side of the
leaf
Dropping of leaves which led to drying of leavesand
branches.
Browingof 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 deathof plant.
Fusariumwilt of chilli

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

6. Disease Cycle

7. Management
Field should be ploughedin summer and the soil should be allowed
to back in hot dry weather.
Long crop rotation (5-7 year).
Use of biological control like Trichodermaspp. ,Pseudomonas
fluorescens, Bacillus subtilisetc.
Use of wilt resistant varitiesArkaLohit,PushaJwala, Jwahar218
,and Pant C2.
Drenching with 1% Bordeaux mixture or Copper Oxychloride50 %.
Seed treatment with Carbendazim2gm/ kg.