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

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

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

  • Must be identified before they can be treated

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


Disease

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


Blight

Canker

Damping off

Galls

Leaf spot

Mildew

Mosaic

Rots

Rust

Smut

Wilt

Chlorosis

Diseases


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

  • 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

  • Bacterial disease

  • Causes open wounds on woody plant stems


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

  • Round swelling or growths on plants

  • Usually caused by an insect that vectors the disease


Leaf spot

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

  • Looks like dots or circles


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

  • Caused by a virus

  • Leaves have irregular mottled areas with patterns

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


Rots

  • Fungus

  • Causes plants to decay and die

  • Usually has a unique smell

  • Improve drainage for the plant to prevent


Rust

  • Fungus

  • Causes small spots on leaves

  • Resembles yellow, orange, brown or red rust

  • Mainly on underneath of leaf


Smut

  • Black powdery disease

  • Causes blisters that burst open

  • Releases black spores

  • Grows on aphid’s honeydew


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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