Northern Corn Rootworm Egg Sampling1

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Abstract
The spatial distribution of the eggs of Diabrotica Longicornis (Say) was studied and it was found that 85% of the eggs in the upper 20 cm of soil were in the top 10 cm. The base of corn plants and cracks in the soil were preferred oviposition sites. It was concluded that a sampling program should include samples at the plant base and between rows to a depth of 10 cm. Of 5 sampling methods evaluated with regard to variability and time, three were statistically reliable. The ‘normal core method,’ which used a 5.4 cm diam core sampler, was the most efficient with regard to time, but a newly-developed ‘frame method’ was recommended as most accurate. An equation was developed to give the percentage confidence that the egg population is below the economic threshold for varying numbers of samples and mean number of eggs per sample.

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