Determining Population Characteristics and Sampling Procedures for the Western Flower Thrips (Thysanoptera: Thripidae) and the Predatory MiteAmblyseius cucumeris(Acari: Phytoseiidae) on Greenhouse Cucumber
作者:
Marilyn Y. Steiner,
期刊:
Environmental Entomology
(OUP Available online 1990)
卷期:
Volume 19,
issue 5
页码: 1605-1613
ISSN:0046-225X
年代: 1990
DOI:10.1093/ee/19.5.1605
出版商: Oxford University Press
关键词: Insecta;Frankliniella occidentalis;Amblyseius cucumeris;sampling
数据来源: OUP
摘要:
Distribution characteristics of the western flower thrips,Frankliniella occidentalis(Pergande), and the predatory miteAmblyseius cucumeris(Oudemans) were studied on greenhouse cucumber and used in developing presence–absence sampling procedures. The variance-mean relationship was described by Taylor's power law and resulted in aggregation indices on middle leaves of 1.62 for thrips larvae and 1.31 for thrips adults andA. cucumeris. Tables are presented for estimating population density from percentage of leaves infested and for determining sample size required at different population densities and precision levels. Thrips density correlated with leaf damage but not with fruit damage.
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