Vertical distribution, spatial dispersion and sequential sampling plan for fruit damage byHelicoverpa armigera(Hübner) (Lepidoptera: Noctuidae) on tomato crop in Burkina Faso
作者:
Denis Bouchard,
Amidou Ouedraogo,
Guy Boivin,
期刊:
Tropical Pest Management
(Taylor Available online 1992)
卷期:
Volume 38,
issue 3
页码: 250-253
ISSN:0143-6147
年代: 1992
DOI:10.1080/09670879209371702
出版商: Taylor & Francis Group
关键词: Helicoverpa armigera;tomato;spatial dispersion;sequential sampling
数据来源: Taylor
摘要:
When tomato plants were vertically divided into three parts, damage byHelicoverpa 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.
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