1. COLLEGE OF AGRICULTURAL TECHNOLOGY
(Affiliated to Tamil Nadu Agricultural University, Coimbatore-3)
Kullapuram (Po),ViaVaigai Dam, Theni-625 562
Bhendi Powdery Mildew
Student Course Teacher
M.A. Nivedhaa, Dr. PARTHASARATHY .S
2015021090 Asst. Professor (Plant Pathology)
2. Causal organism: Erysiphe cichoracearum
The Pathogen was first discovered by De Candolle in 1805
Distribution:
World: Asia, Africa, North America, Central America,
Europe.
India: Karnataka, Madhya Pradesh, Maharastra, Tamil
Nadu, West Bengal, Uttar Pradesh
4. Significance
During the winter, the fungus survives on infected
plants parts and in debris such as fallen leaves.
It may produce resting structure known as
Cleistothecia. These will appear as small black
spots within the white powdery patches.
5. White powdery growth on upper surface of the leaf,
latter tunes grey.
Affected leaves dry and fall off prematurely
Symptoms
6. Ectophytic mycelium producing chain of single
celled, hyaline, barrel shaped and in long chains.
Cleistothecia are globose and dark brown myceloid
appendages.
Pathogen characters
7. Sexual fruiting body is chasmothecium which
bears asci and ascospores.
The number of ascospore is usually 2 rarely 3
per ascs. The ascospores are single celled, hyaline
and oval to sub cylindrical
9. Next spring, the sexual spores ascospores are
released from the clestothecia, shot up into the air
and carried by air currents to leaves of plants where
new infections will begin.
During growing season, the fungus produces
asexual spores conidia that help the fungus to spread
and infection to build.
Disease cycle
11. Favorable conditions:
Spores germinate optimally at 20-25°C.
Dry humid weather
Low relative humidity
Mode of spread:
Primary : Air borne conidia
Secondary : Ascospores from the infected debris
12. Management:
Cultural method:
1) Field sanitation
2) Remove the infected debris and destroy
Chemical method:
Spray inorganic sulphur 0.25% or Dinocap 0.1% 3 or 4
times at 15 days interval
