How to measure a disease?

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How to measure a disease?..

Answer / zauva

All plants are suffering from a diseases, either in the
initial stage or later parts of its life cycle.
If the plant is suffering from the diseases in the early
growth stage, surely it will be very serious in later and
will affect the growth and yield severely if not controlled.
If the incidence of the diseases is in the later stage and
if it is well manage the reduction in yield would be reduced.

The crop is said to be healthy unless the yield and its
physiological function are not disturbed even if the disease
is prevelent.

But the plant is suffering from a desease when the plant
could not give the yield upto the level of its genetic
potential.

the severity of the diseses could be measured by the numbers
of leaves infected, percentage of the disease in the leaves
and in the sten. colour changes, etc.

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How to measure a disease?..

Answer / guest

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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