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Diseases. Help me! I’m dying. Disease. Disease is a plant disorder caused by an infectious pathogen or agent. Host – Plant the disease attacks Pathogen – Any disease causing agent Environment – moisture and temperature needed for the pathogen to grow. Bacteria Single-celled organism

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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

Host – Plant the disease attacks

Pathogen – Any disease causing agent

Environment – moisture and temperature needed for the pathogen to grow

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
  • Preventing plant disease through sanitation and insect control is much easier than treating the disease.
diseases1
Blight

Canker sores

Damping off

Galls

Leaf spot

Mildew

Mosaic

Rots

Rust

Smut

Wilt

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
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
mosaic
Mosaic
  • Caused by a virus
  • Leaves have irregular mottled areas with patterns
  • Ranges from dark green to light green to yellow to white
  • Tomato mosaic virus is common in tomatoes
slide14
Rots
  • Fungus
  • Causes plants to decay and die
  • Usually has a unique smell
  • Improve drainage for the plant to prevent
slide15
Rust
  • Fungus
  • Causes small spots on leaves
  • Resembles yellow, orange, brown or red rust
  • Mainly on underneath of leaf
slide16
Smut
  • Black powdery disease
  • Causes blisters that burst open
  • Releases black spores
  • Grows on aphid’s honeydew
slide17
Wilt
  • Fungus
  • Disease that blocks the uptake of water in plants stems
  • Causes plants to look constantly wilted even when adequately watered