1. Objective: Discuss diseases and viruses.

2.  Plant disorders caused by an infectious pathogen or agent  3 conditions necessary for diseases in plants:  Host plant is the plant the disease attacks  Disease causing organism or pathogen must be present  A favorable environment for disease organism to develop (warm & moist)

3.  Using the sources in the room define the following terms related to plant diseases:  Pathogen  Fungi  Bacteria  Virus

4.  Bacteria are single celled microorganisms Bacterial Leaf Spot Rings of different shades of brown, green or yellow spots on leaves Bacterial Blight Causes plant to quickly turn brown or black as if they had been burned

5.  Consider a tomato…look up one Bacteria found in the tomato plant.  Fill in the chart provided.

6.  Fungi cannot make their own food  They develop hyphae, structures that grow & absorb nutrients from the host plant  Many fungi spread by spores  Fungi diseases:  Damping off  Rust  Powdery mildew  Galls Look up these common Fungi diseases! You have 10 minutes!

7. Damping OffRustPowdery Mildew Galls Causes young plants and seedlings to rot off at the soil level Cause small spots on the leaves that resemble yellow, orange, brown or red rust mainly on the underside of leaves Grows on the upper & lower leaf surface as white or gray powdery substance. Common in houseplants. Round swellings or growths usually on tree branches or leaves.

8.  Consider a tomato…look up one Fungus found in the tomato plant.  Fill in the chart provided.

9.  Pathogens with an extremely narrow host range and are usually a threat to crops Attacks tomatoes, peppers, poinsettias & tobacco Can be transferred by hands of a smoker Wash hands before working with plants to control the spread of this virus Causes irregular mottled areas with patterns ranging from dark to light green and yellow to white

10.  Consider a tomato…look up one Virus found in the tomato plant.  Fill in the chart provided.

11.  Horticultural disease and viruses can dramatically impact the plant industry  Find a Current Event that dealing with a plant’s disease or virus  Be sure to specifically state the disease/virus and how it causes damage to the host  Summarize the Current Event in a half page (minimum)  Site your sources