Core and cube sample units were used to sample 3 and 13 central Iowa cornfields for corn rootworm larvae in 1978 and 1979, respectively. A washing-sieving-flotation technique was superior to visual searching or Tullgren funnels for recovering larvae from soil samples. Storage at subfreezing temperatures provided the best means of preserving samples. Optimal sampling plans were calculated for both sample units from variance components and cost estimates. Corn rootworm larvae can be sampled most efficiently by collecting a single cube sample at systematically selected locations. Sample sizes are presented for specified levels of precision.
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Bergman et al. (1981) studied this question.