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Numerica! and Binomial Sequential Sampling Plans for the Hop Aphid (Homoptera: Aphididae) on Hop Leaves

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Abstract:

The number of hop aphids, Phorodon humuli (Schrank), per main stem leaf at a height of 2 m was representative of aphid density per leaf over the whole hop plant( Humulus lupulus L.). Therefore, sampling was based on main stem leaves at the 2-m elevation. Taylor's power law was used to develop a numerical sequential sampling plan for a critical density (control threshold) of aphids. A binomial (presence-absence) sequential sampling plan was developed based on Taylor's power law. On the average, the binomial method required fewer samples than the numerical method, and the level of error was about as expected. Significantly more aphids were found on border rows of hop yards than in yard interiors. Samplin˜ aphids in hop cones was too time consumin˜ to be practical. Although the number of aphids on leaves was significantly related to the number in cones, determining numbers in cones from leaf samples was too inaccurate for management purposes.

Document Type: Research Article

Publication date: August 1, 1990

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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