Deciding What to Do > Pests > Diseases
The Disease Pyramid
 
The disease pyramid is a diagram to help understand that for disease to take off there are four things that have to be in place.

For disease to occur the pathogen (organism causing the disease) has to be there. The pathogen must have a susceptible host and the environment has to be conducive for the pathogen to survive and do well. Finally, this all has to occur at the same time and for long enough. So there are four points to the disease pyramid.
 
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