Abstract
The second and third generations of Lobesia botrana can cause both yield losses and spreading of grape bunch rots. The aim of this study was to know to what degree these generations of L. botrana influence the rots at harvest time. The study was carried out in two grape-growing areas of northeastern Italy where the moth completes two and three generations per year, respectively. In the context of 12 insecticide trials, samplings were conducted in different plots to estimate the number of larval nests of the second and third generations and that of rotten berries at harvest time. The data sets (number of larval nests and rotten berries) from the different trials were submitted to regression analyses. Gray mold was the most important grape rot. The second generation, in the area where L. botrana has only two generations per year, and the third generation, in the area where the moth completes three generations per year, can favor gray mold on and around berries bored by larvae. In contrast, groups of rotten berries non-contiguous to larval nests did not appear to be influenced by moth activity. In the area where the moth completes three generations per year the larval nests of the second generation did not show a significant influence on bunch rots at harvest time.
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We thank the grapevine growers for cooperation in carrying out this research and the Consorzio Tutela Vini DOC Friuli Isonzo (Cormons, Gorizia, Italy) for providing grapevine phenology and meteorological data.
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Pavan, F., Bigot, G., Cargnus, E. et al. Influence of the carpophagous generations of the European grapevine moth Lobesia botrana on grape bunch rots. Phytoparasitica 42, 61–69 (2014). https://doi.org/10.1007/s12600-013-0338-5
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DOI: https://doi.org/10.1007/s12600-013-0338-5