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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Spatial distribution and sampling plans for grapevine plant canopy-inhabiting scaphoideus titanus (Hemiptera: Cicadellidae) nymphs
Journal of Economic Entomology, Volume 109, No. 2, Year 2016
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Description
The paper deals with the study of the spatial distribution and the design of sampling plans for estimating nymph densities of the grape leafhopper Scaphoideus titanus Ball in vine plant canopies. In a reference vineyard sampled for model parameterization, leaf samples were repeatedly taken according to a multistage, stratified, random sampling procedure, and data were subjected to an ANOVA. There were no significant differences in density neither among the strata within the vineyard nor between the two strata with basal and apical leaves. The significant differences between densities on trunk and productive shoots led to the adoption of two-stage (leaves and plants) and three-stage (leaves, shoots, and plants) sampling plans for trunk shoots- and productive shoots-inhabiting individuals, respectively. The mean crowding to mean relationship used to analyze the nymphs spatial distribution revealed aggregated distributions. In both the enumerative and the sequential enumerative sampling plans, the number of leaves of trunk shoots, and of leaves and shoots of productive shoots, was kept constant while the number of plants varied. In additional vineyards data were collected and used to test the applicability of the distribution model and the sampling plans. The tests confirmed the applicability 1) of the mean crowding to mean regression model on the plant and leaf stages for representing trunk shoot-inhabiting distributions, and on the plant, shoot, and leaf stages for productive shoot-inhabiting nymphs, 2) of the enumerative sampling plan, and 3) of the sequential enumerative sampling plan. In general, sequential enumerative sampling was more cost efficient than enumerative sampling. © 2015 The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America.
Authors & Co-Authors
Jermini, Mauro
Switzerland, Wadenswil
Forschungsanstalt Agroscope Changins-wadenswil
Trivellone, Valeria A.
Switzerland, Wadenswil
Forschungsanstalt Agroscope Changins-wadenswil
Baumgärtner, Johann U.
United States, Kensington
Center for the Analysis of Sustainable Agricultural Systems Casas
Statistics
Citations: 1
Authors: 3
Affiliations: 4
Identifiers
Doi:
10.1093/jee/tov382
ISSN:
00220493