Diseases
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Diseases. Help me! I’m dying. Disease. Disease is a plant disorder caused by an infectious pathogen or agent. Bacteria Single-celled organism Must remain in host or under debris Actively divide to spread Fungi Multi-cellular Eats on plants and hurts them in the process

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Diseases

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Diseases

Diseases

Help me! I’m dying.


Disease

Disease

  • Disease is a plant disorder caused by an infectious pathogen or agent


Groups of pathogens

Bacteria

Single-celled organism

Must remain in host or under debris

Actively divide to spread

Fungi

Multi-cellular

Eats on plants and hurts them in the process

Produces spores that spread

Viruses

Ultramicroscopic parisites

Attack plant tissues

Should destroy plant completely if found

Parasitic plants-

A plant that attaches to another plant

Ex. mistletoe, dodder, lichens

Groups of pathogens


Plant disease

Plant Disease

  • Must be identified before they can be treated

  • Warm temperatures and moist conditions in greenhouse plant production make most horticulture plant diseases worse


Disease1

Disease

  • Prevention through sanitation and insect control is much easier than treating the disease.


Diseases1

Blight

Canker

Damping off

Galls

Leaf spot

Mildew

Mosaic

Rots

Rust

Smut

Wilt

Chlorosis

Diseases


Blight

Blight

  • Infectious bacterium

  • Cause plant to quickly turn brown or black as if they had been burned

  • One specific blight is fire blight-devastating apple crops

  • Prune 6-8” below infection


Chlorosis

Chlorosis

  • Normally green tissue is pale, yellow, or bleached. It results from failure of chlorophyll to develop because of infection by a virus

  • Happens from fertilizer, cold weather, water, etc


Canker

Canker

  • Bacterial disease

  • Causes open wounds on woody plant stems


Damping off

Damping off

  • Fungal disease

  • Causes young plants and seedling to rot off at soil level

  • Need clean containers and soil and plenty of air circulation between plants


Galls

Galls

  • Round swelling or growths on plants

  • Usually caused by an insect that vectors the disease


Leaf spot

Leaf spot

  • Rings of different shades of brown, green, or yellow

  • Looks like dots or circles


Mildew

Mildew

  • Fungus

  • Grows on leaf surfaces

  • Appears as white, gray or purple spots

  • Example is powdery mildew

  • Homemade remedy= 2 tsp baking soda + horticultural oil with 1 gal water


Tobacco mosaic mosiac

Tobacco Mosaic & Mosiac

  • Caused by a virus

  • Leaves have irregular mottled areas with patterns

  • Ranges from dark green to light green to yellow to white


Diseases

Rots

  • Fungus

  • Causes plants to decay and die

  • Usually has a unique smell

  • Improve drainage for the plant to prevent


Diseases

Rust

  • Fungus

  • Causes small spots on leaves

  • Resembles yellow, orange, brown or red rust

  • Mainly on underneath of leaf


Diseases

Smut

  • Black powdery disease

  • Causes blisters that burst open

  • Releases black spores

  • Grows on aphid’s honeydew


Diseases

Wilt

  • Fungus

  • Disease that blocks the uptake of water in plants stems

  • Causes plants to look constantly wilted even when adequately watered


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