Sequential Sampling for White Grubs

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Abstract
> The results of sampling to determine the vertical distribution of white grubs in the soil and the frequency distribution of grubs per 1-square-foot sample unit are presented. It was found that the optimum sampling period is during June and July, when most of the grubs are in the upper foot of soil. The negative binomial distribution with a k value of 1.5936 fitted most of the data well and was used to devise two sequential sampling methods: one for classifying white grub populations as light, moderate or severe; the other for pre-planting surveys to determine whether or not control measures are required.