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ANNAMALAI UNIVERSITY
FACULTY OF AGRICULTURE
DEPARTMENT OF PLANT PATHOLOGY
PAT-501 MYCOLOGY
GENERAL CHARACTERS AND LIFE CYCLE OF GENUS PERONOSPORA ,
PSEUDOPERONOSPORA, PLASMOPARA , BREMIA , SCLEROSPORA ,
PERONOSCLEROSPORA
BY
R.LOKESH
I -M.sc.,Agriculture
Plant pathology
Annamalai university
TOPIC:
Part-3
Peronosclerospora sorghi
Scientific classification
Kingdom: Chromista
Phylum: Oomycota
Order: Peronosporales
Family: Peronosporaceae
Genus: Peronosclerospora
Species: P. sorghi
Binomial name
Peronosclerospora sorghi
(W. Weston & Uppal) C.G. Shaw, (1978)
SYMPTOMS
• Infected plant chlorotic and sometime stunted, white-stripped leaves &
abnormal seed set.
•The chlorotic area of leaf always includes the base of the blade, and
transverse margins usually sharply defined between the diseased and
healthy tissues
•A white, downy growth may appear on both surface of infected leaves.
Sometimes tassels of diseased plant may exhibit phyllody.
•Tolerant plants may show symptoms of systemic infection but have normal
seed production.
HEALTHY LEAF INFECTED LEAF AND PLANTS
Disease Cycle
• The primary infection is by means of oospores present in the soil
which germinate and initiate the systemic infection.
• Oospores persist in the soil for several years. Secondary spread is by
air-borne sporangia.
• Presence of mycelium of the fungus in the seeds of systemically
infected plants is also a source of infection.
• The disease has been known to occur through
a collateral host, Heteropogen centortus on which the fungus
perpetuates of the host. The breakdown of tissue causes shredding.
• The oospores either fall to the soil or are wind blown, often within host
tissue. They can remain viable in the soil for 5-10 years.
• Conidia are formed at night in large numbers. The optimum
temperature for production is 20-230C.
DOWNY MILDEW FUNGI PART -3.pptx
DOWNY MILDEW FUNGI PART -3.pptx
DOWNY MILDEW FUNGI PART -3.pptx

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DOWNY MILDEW FUNGI PART -3.pptx

  • 1. ANNAMALAI UNIVERSITY FACULTY OF AGRICULTURE DEPARTMENT OF PLANT PATHOLOGY PAT-501 MYCOLOGY GENERAL CHARACTERS AND LIFE CYCLE OF GENUS PERONOSPORA , PSEUDOPERONOSPORA, PLASMOPARA , BREMIA , SCLEROSPORA , PERONOSCLEROSPORA BY R.LOKESH I -M.sc.,Agriculture Plant pathology Annamalai university TOPIC: Part-3
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  • 15. Peronosclerospora sorghi Scientific classification Kingdom: Chromista Phylum: Oomycota Order: Peronosporales Family: Peronosporaceae Genus: Peronosclerospora Species: P. sorghi Binomial name Peronosclerospora sorghi (W. Weston & Uppal) C.G. Shaw, (1978)
  • 16. SYMPTOMS • Infected plant chlorotic and sometime stunted, white-stripped leaves & abnormal seed set. •The chlorotic area of leaf always includes the base of the blade, and transverse margins usually sharply defined between the diseased and healthy tissues •A white, downy growth may appear on both surface of infected leaves. Sometimes tassels of diseased plant may exhibit phyllody. •Tolerant plants may show symptoms of systemic infection but have normal seed production.
  • 17. HEALTHY LEAF INFECTED LEAF AND PLANTS
  • 18.
  • 19.
  • 20. Disease Cycle • The primary infection is by means of oospores present in the soil which germinate and initiate the systemic infection. • Oospores persist in the soil for several years. Secondary spread is by air-borne sporangia. • Presence of mycelium of the fungus in the seeds of systemically infected plants is also a source of infection. • The disease has been known to occur through a collateral host, Heteropogen centortus on which the fungus perpetuates of the host. The breakdown of tissue causes shredding. • The oospores either fall to the soil or are wind blown, often within host tissue. They can remain viable in the soil for 5-10 years. • Conidia are formed at night in large numbers. The optimum temperature for production is 20-230C.