Sequential Sampling Plans for Sweep Net and Visual Sampling of Oebalus pugnax1 in Rice

Abstract Sequential sampling plans were developed for the sweep net and the visual sampling methods “long stick” and “sweep stick.” Relative cost-reliability that incorporates probability of adoption showed that sampling with the long stick is more cost-reliable than with the sweep net. Two passes of the sweep stick was less cost-reliable than the sweep net method at low densities but was more cost-reliable at densities of eight or more adult O. pugnax per ten sweep net sweeps. For sweep net sampling, comparison of the currently used fixed sample size plan (n=10) and sequential sampling showed that sequential sampling reduced the number of sample units required to reach a decision by 56%.