Evaluation of Procedures for Sampling Heliothis zea and Keiferia lycopersicella on Tomatoes123

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Abstract
Techniques for sampling 2 pests of tomatoes, Heliothis zea (Boddie) and Keiferia lycopsicella (Walsingham) were tested for accuracy and efficiency. Samples of leaves from the upper half of the plant were most effective for sampling H. zea eggs and larvae. A nondestructive cluster sampling technique was developed for detecting fruit damage by H. zea. This cluster method compared favorably with destructive sampling (picking) of individual fruit. Relationships between detection levels and surface area of fruit sampled were established for use in current treatment thresholds and for further studies of H. zea. The lower leaf and large fruit sampling methods were best for detecting presence of and damage, respectively, by K. lycopersicella larvae.
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