Abstract
Abstract When tomato plants were vertically divided into three parts, damage by Helicoverpa armigera (Hubner) was regularly distributed in the dry season but significantly less damage was found at the top of the plant during the rainy season. The spatial distribution of damage in fields was studied by using Iwao's patchiness regression technique. Fruit damage was highly aggregated with a stabilization of this pattern with increased injury level. A sequential sampling plan, using 3% fruit damage per plant as an economic threshold, was prepared to evaluate damage prior to insecticide treatment. A maximum of 21 plants was needed when the damage level was at or near the economic threshold with this sampling plan.
Published Version
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