A Sequential Sampling Plan for Red-Pine Sawfly Neodiprion nanulus Schedl.12

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Abstract
A recent outbreak of the red-pine sawfly, Neodiprion nanulus Schedl., has caused considerable damage to plantation red pine (Pinus resinosa Ait.) in northern New York State. A study of sampling methods for this pest led to the development of the sequential technique for use in control work. The experimental design, methods, and techniques used in the study are described, and a sequential sampling plan based on egg-infested needles found on 6-inch twig samples is presented. It was found, in testing the plan on field-collected data, that 45% in sampling time would have been saved had the plan been available for use at the time the field counts were made, Also, a test on the accuracy of the sequential plan showed that it failed only once in 25 trials to predict accurately the degree of defoliation to be expected at sampled locations. The confidence levels for the plan were set at 90%.

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