SPATIAL ARRANGEMENT OF THE EGGS OF HYLEMYA BRASSICAE (BOUCHÉ), AND A SEQUENTIAL SAMPLING PLAN FOR USE IN CONTROL OF THE SPECIES

Publisher Website
Google Scholar
Abstract
Counts of eggs of Hylemya brassicae (Bouche) in cabbage did not conform to the Poisson distribution owing to a preponderance of uninfested and highly infested plants. But when the negative binomial series was fitted to the observed distribution, the discrepancies were not significant when tested by chi-square. The spatial pattern may be described by expansion of (q[long dash]px)-k with a common k of 0.95. Three methods of transformation stabilized the variance of field counts. A sequential sampling plan based on the negative binomial distribution and providing for 2 infestation classes was drawn up for use in control of the insect in the stem brassicas.