Abstract
Experiments were conducted to characterize the spatial structure of corn rootworm eggs and larvae using geostatistics and to determine the distributional relationships among egg, larvae, and edaphic and topographic factors. Egg and larval dispersions were investigated at three different spatial scales because spatial dispersion patterns often depend upon scale. Semivariograms of egg dispersion showed no spatial dependence at large scale, indicating a random or uniform dispersion. In a small-scale study, egg dispersion patterns in two fields were random or uniform at a 0.2-m sampling distance but one field exhibited high aggregation. The semivariogram of larval dispersion showed an aggregated pattern at all the spatial scales used. Map correlation analysis was used to determine the distributional relationships among egg, larvae, and edaphic and topographic factors. Soil moisture positively affected com rootworm egg and larval dispersion, but there were no topographic effects on egg and larval dispersions. This study demonstrated the dynamic relationships among com rootworm eggs and larvae and environmental factors in dispersion as well as abundance.
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