Research and management oriented sampling plans for vine plant inhabiting Scaphoideus titanus Grape leafhopper nymphs
Articolo
Data di Pubblicazione:
2013
Citazione:
Research and management oriented sampling plans for vine plant inhabiting Scaphoideus titanus Grape leafhopper nymphs / I.E. Rigamonti, V. Trivellone, C. Brambilla, M. Jermini, J. Baumgärtner. - In: IOBC/WPRS BULLETIN. - ISSN 1027-3115. - 85:(2013), pp. 29-35.
Abstract:
This paper summarizes the methodology used for describing the spatial distribution of the
grape leafhopper Scaphoideus titanus in a vineyard located in Southern Switzerland and presents
sampling plans for research and management purposes. The sampling technique consisted of repeated
visual counts of S. titanus nymphs. In general, a vineyard is a highly structured environment whose
influence on spatial distributions is studied by analyses of variance and quantified by regression
models developed in a stratified and multi-stage sampling universe. First, a regression model was
applied to the relationship between the proportion of infested trunk shoot leaves and the mean density
of trunk shoot leaves. This allowed the translation of a critical density for entering the vineyard in an
adaptive management (AM) program into a critical proportion. A sequential binomial sampling plan
was developed to efficiently decide whether a vineyard should be included into the AM program or
not. Second, the spatial distribution in the entire vine plant canopy was analysed. Since there were
significant differences between densities on trunk shoots and productive shoots, two different
sampling plans were designed. However, there were no significant differences between other strata
(parts of the vineyard, leaf position within shoots), so that they were disregarded in sampling plan
design. The mean crowding – mean regression model, with the intercept set to 0, indicated aggregated
distributions at the vineyard, shoot type and shoot levels. On the basis of this statistics, enumerative
and sequential sampling plans are proposed and implemented in the AM framework. The here
presented sampling techniques are advantageous over the previously used beating tray method and the
sampling plans are useful for research and management purposes
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Adaptive Management ; trunk shoots ; productive shoots ; enumerative and sequential sampling plans ; sequential sampling plan ; enumerative sampling plan
Elenco autori:
I.E. Rigamonti, V. Trivellone, C. Brambilla, M. Jermini, J. Baumgärtner
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