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Epidemiologists use specific terminology to accurately
communicate magnitudes and potentials for disease
Incidence: the number or proportion of plant units diseased
Severity; the proportion of area or amount of plant tissue
that is diseased
Yield loss; the proportion of yield that a grower will not
be able to harvest due directly to the disease
Economic loss; the reduction in economic returns due to
disease. What about compensation of plants which results in
no yield loss though one has up to 50% plants lost due to
disease? Think about the "Green Revolution".
Economic threshold; when the amount of gain from control
equals the amount of estimated loss from the disease
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