Course BSc Botany Semester II Paper Name Mycology and - - PowerPoint PPT Presentation

• Course – BSc Botany
• Semester – II
• Paper Name – Mycology and Phytopathology /BOT CC203
• Topic - Black Rust of Wheat
• Faculty Name – Dr Piyush kumar Rai
• E.mail – raipiyush518@gmail.com

INFECTED RUST DISEASE OF WHEAT PLANT

SYSTEMATIC POSITION OF PATHOGEN

Kingdom- fungi Division- Eumycota Class – Basidiomycetes Order- Uredinales Family – Pucciniaceae

PATHOGEN : PUCCINIA GRAMINIS TRITICI

• Rust of wheat is a very destructive disease cause enormous

losses in all wheat growing region of the world .

• Earliest know disease of crop plants .
• Persoon (1797) first time reported that the disease is caused

by a fungus .

TYPE OF RUST IN INDIA

Black or stem rust – Puccinia graminis tritici Brown or orange rust – Puccinia recondita Yellow or stripe rust – Puccinia striiformis

WHEAT RUSTS

SYMPTOM

• Symptom are produce on almost all aerial parts of the wheat

plant but are most common on stem , leaf sheaths and upper leaf surface .

• Pustules are dark reddish brown occur on both sides of the

leaves ,on the stem and on the spike .

• Pustules are usually separate and scattered .

SYMPTOM

• Prior to pustules

formation, flecks may appear .

• As the spore masses break

through , the surface tissue take on a ragged and torn appearance.

FAVOURABLE CONDITIONS

• Moisture and temperature

above 20 °C flavour the development of disease.

CAUSAL ORGANISM

• Puccinia graminis tritici is the causal organism.
• It is an obligate parasite .
• In life cycle Two type of mycelia are Dikaryotic and Monokaryotic
• The dikaryotic mycelium occurs in the primary host ie. Wheat plant .
• The Monokaryotic mycelium occurs in the alternate host ie. Barbery

bushes.

STAGE OF THE PATHOGEN

• Stage 0 – Spermagonium
• Stage 1 – Aecium
• Stage 2 – Uredium
• Stage 3 - Telium
• Stage 4 – Basidium

MODE OF SPREAD

• Primary spread : Wind borne are Uredinospore and

Aeciospores

• Secondary spread: Rain is necessary for effective

deposition of uredinospore

• Teliospores : with the Straw .

PRIMARY AND SECONDARY INOCULUM OF WHEAT STEM ROOT

DISEASE CYCLE

DISEASE MANAGEMENT

• Eradication of complete alternate host is an important

measure for the control of the disease.

• Resistant varieties like NP-710 , NP-718, NP- 770, NP -809 ,

NP- 829, NJ- 146 AND NJ – 284 etc.

• Some Mexican varieties like Sonora 63 ,64 and lerma Roja

are almost completely resistance to black rust.

• Use of fungicide: sulphur Dusting
• By spraying the wheat crop with parzat liquid with zinc

sulphate.

• Systematic fungicide like vitavax , plantvax etc.
• Mixed cropping of wheat and barley is also a good

measure to combat the disease.

• Thank – you