Walk the field in a W pattern checking 50 plants. 10 in one line, 10 in another, 10 in another, 10 in another and 10 in last line. Check each plant for viral disease. The % of the 50 plants is your prevalence. So, if 25/50 were infected then prevalence is 0.5 or 50%
Posted by: David Hughes
(55 points)
Posted: August 16, 2020
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