Final Take-Home Quiz For Bisc 108

Final Take-home Quiz for Bisc 108

Once you download this quiz, you must complete it and return it to me within 30 minutes. If for some reason the photos do not load, let me know. You can complete the quiz without them.

Sudden Oak Death

Sudden Oak Death (SOD) is a fungus-like pathogen (Phytohthora ramorum) responsible for killing tens of thousands of oak trees in California. The California Department of Food and Agriculture found the pathogen in a 500-acre plant nursery, and scientists are now concerned the sale of those plants around the country will also spread the disease. A case was recently discovered in Pennsylvania, in a bonsai camellia shipped from California. SOD has killed 40 to 45 percent of live oaks in the hardest hit areas, such as Marin County, California.

The pathogen is similar to one that appeared in the United States around 1904. That pathogen caused a disease that attacked chestnut trees and within 50 years had destroyed all 3.5 billion chestnut trees in the United States. SOD could cause a similar wholesale destruction of oak and other species of tree throughout the country, especially in the east and south.

Symptoms vary from plant to plant, and may include leaf spots, needle and tip blight, shoot-tip dieback, and canker formations. Many other plant pathogens cause the same symptoms, so the only way to confirm the presence of SOD is through laboratory testing.

The disease is spread naturally and artificially. In nature, the pathogen is spread through the movement of water in the form of rain, mist, dew and runoff. Humans spread the disease through the movement of infected nursery stock, firewood and soil on the bottoms of shoes and boots. There is no pesticide registered by the U.S. Environmental Protection Agency that will eradicate the organism that causes SOD.

QuickTime™ and a QuickTime™ and a TIFF (Uncompressed) decompressor TIFF (Uncompressed) decompressor are needed to see this picture. are needed to see this picture.

1) What strategies would you recommend in dealing with this threat? ( 5 pts)

2) Complete the following table: (8 pts)

organic growing conventional growing

Advantages Disadvantages

3) List 3 major problems that pertain to soil science. ( 3 pts) 4) Describe the symptoms of: ( 3 pts)

Overwatering

Underwatering

Too much fertilizer

Draw a Stella model concept map of the soil food web in the greenhouse Tropical room. ( 6 pts) Use the Drawing Tools in Word (go to toolbar and select drawing) Then you can use boxes, circles and arrows- 1- way and 2-way. You do not need the Stella program.