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  • » Spatial Distribution of Nymphs of Scaphoideus titanus (Homoptera Cicadellidae) in Grapes, and Evaluation of Sequential Sampling Plans

Spatial Distribution of Nymphs of Scaphoideus titanus (Homoptera Cicadellidae) in Grapes, and Evaluation of Sequential Sampling Plans

Federico LESSIO and Alberto ALMA, 2006

The spatial distribution of the nymphs of Scaphoideus titanus Ball (Homoptera Cicadellidae), the vector of grapevine ßavescence dore´e (Candidatus Phytoplasma vitis, 16Sr-V), was studied by applying TaylorÕs power law. Studies were conducted from 2002 to 2005, in organic and conventional vineyards of Piedmont, northern Italy. Minimum sample size and Þxed precision level stop lines were calculated to develop appropriate sampling plans. Model validation was performed, using independent Þeld data, by means of Resampling Validation of Sample Plans (RVSP) resampling software. The nymphal distribution, analyzed via TaylorÕs power law, was aggregated, with b  1.49. A sample of 32 plants was adequate at low pest densities with a precision level of D0  0.30; but for a more accurate estimate (D0  0.10), the required sample size needs to be 292 plants. GreenÕs Þxed precision level stop lines seem to be more suitable for Þeld sampling: RVSP simulations of this sampling plan showed precision levels very close to the desired levels. However, at a preÞxed precision level of 0.10, sampling would become too time-consuming, whereas a precision level of 0.25 is easily achievable. How these results could inßuence the correct application of the compulsory control of S. titanus and Flavescence dore´e in Italy is discussed. KEY WORDS grape, leafhopper, vector, TaylorÕs power law, Þeld sampling

(FANNY PREZMAN)
Published on: 29/08/2016
European logoThis project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement N°652601
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