Sequential Sampling for Use in Control of the Cabbage Looper on Cauliflower

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Abstract
Sequential sampling, in which decisions depend upon the accumulated results of a series of observations, leads to considerable saving of time and effort. A sequential plan, based on the negative binomial distribution and providing for 2 infestation classes, was drawn up for use in control of the cabbage looper, Trichoplusia ni (Hubner), on cauliflower. An appraisal of the plan under field conditions showed that it reduced the sampling time by 2/3 while rating the infestation correctly in 82 of 84 cases. With the 2 discrepancies, population means lay between the limits setforthe infestation classes.