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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