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Introduction to plant Pathology
Plants as do people get sick
Plant pathology is the study ofmicroorganisms and environmental
factors that cause plant disease A plant is considered healthy if it carry
out its functions to the best of itsgenetic ability
When a plant function is interfered withby a microorganism or environmentalfactor the plant is diseased
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Classification of plant diseases
Infectious diseasesDiseases caused by fungi
Diseases caused by prokaryotes(bacteria & mollicutes)
Diseases caused by protozoa
Diseases caused by nematodes
Diseases caused by viruses andviroids
Diseases caused by parasitic plants
Non-infectiousdiseasesDiseases caused by low or high
temperature
Diseases caused by lack or excess soilH2O
Diseases caused by air pollution
Diseases caused by mineral toxicities
Diseases caused by nutrientdeficiencies
Diseases caused by lack of oxygen
Diseases caused by toxicity ofpesticides
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ColorChange
1- yellowing 2- Mosaic 3- streak 4- Redding 5- Albinism 6- Greening
Necrosis
1- Spots 2- Canker 3- Blisters 4- Shot-hole 5- Blotch 6- Scald 7- Blight 8- Scorch 9- Rot 10- die-back 11- Mummification 12- Gummosis 13- Damping off 14- wilting
Malformation
1- Resetting 2- Dwarfing 3- Gall & Knot 4- Scab 5- Curl
Plant Disease
Symptoms
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Color changeYellowing
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Mosaic
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Streak
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Albinism
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Greening
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Necrosis (death of Plant tissues)
Spots
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Stripe
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Canker
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Shot-hole
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Scald
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Blight
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Scorsh
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Rot
Soft Dry
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Die Back
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Gummosis
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Damping-off
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Wilting
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MalformationResetting
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Dwarfing
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Gall & Knot
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Scab
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Curl
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Signs of the disease
Examples of the disease signs
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Isolation of fungal diseases
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Mohamed Mannaa