B. G. Hill, R. W. McNew, J. H. Young, W. E. Ruth. 1975. The effects of sampling-unit size in some southwestern Oklahoma cotton insects. Environmental Entomology 4 (3): 491-494.

Keywords: the variables of sampling-unit characteristics for four cotton insects

Abstract: Whole plant counts (visual in situ examination) for hooded beetles, Notoxus monodon F.; cotton fleahoppers Pseudatomoscelis seriatus (Reuter); lady beetles Hippodomia spp.; and collops Collops spp., were made on ¼ acre of cotton to determine the best sampling-unit size. The insect counts were distributed according to the negative binomial, with k values increasing with sampling-unit size. The number of samples, linear row feet, and sampling time required for equal precision are illustrated for 7 sampling-unit sizes at 2 levels of precision. The single plant sampling-unit was determined as optimum for minimizing the variance.