Unformatted text preview: The pathogen disease progress curve will increase and then decrease forming a zigzag pattern. 4. What is a disease gradient? How is it different from a Disease Progress curve? (2 pts) A disease gradient shows the spread of disease in an area. A disease progress curve is shows the intensity of a disease. 5. What is an agroecosystem? List 3 characteristics of agroecosystems that make them more favorable for disease development than natural ecosystems. (2pts) An agroecosystem is an independent community that has very little change because of management practices by humans. Natural predators are eliminated, hosts do not build resistance because they are constantly replaced, there are more host plants that are the same and are densely packed in a small area....
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- Spring '08
- Infectious Disease, disease progress curve, complete resistance