Sampling Program for Estimating Plant Damage Caused by the Onion Maggot (Diptera: Anthomyiidae) on the Regional and Field Levels

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Abstract
Regional and field level sampling programs were developed to assess onion maggot, Delia antiqua (Meigen), damage to plants during first-and second-generation larval periods. Log variance/log mean regressions were used with simple and two-stage sampling techniques to estimate sample precision for different sizes of sampling units and numbers of samples taken. Optimal sampling strategies were developed based on minimizing the cost of sampling while maximizing precision. Four years of implementation results show the techniques to be efficient, precise, and useful for various applications.

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