Risk of Spotted-Wing Drosophila Injury and Associated Increases in Acetic Acid in Minnesota Winegrapes

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Figure 1
Mean acetic acid levels for four winegrape varieties infested with Drosophila suzukii and left on the vine ~2 weeks prior to harvest at the Horticultural Research Center, Excelsior, MN, 2017. Harvest dates were Itasca and Marquette 28 Sept 2017, and Frontenac and La Crescent 20 Oct 2017. Tukey’s honest significant difference test, where different letters indicate significance (p < 0.05), are exclusive to each variety.
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Figure 2
Mean acetic acid levels for four winegrape varieties infested with Drosophila suzukii, and left on the vine 2 weeks prior to harvest at the Horticultural Research Center, Excelsior, MN, 2019. Harvest dates were La Crescent and Marquette 1 Oct 2019, and Frontenac and Itasca 15 Oct 2019. Tukey’s honest significant difference test, where different letters indicate significance (p < 0.05), are exclusive to each variety.

Table 1
Infestation levels of Minnesota winegrapes by Drosophila suzukii in laboratory assays in 2017, summarized as mean (± SEM) and percent D. suzukii infestations of larvae and/or pupae per berry, for 34 varieties collected at harvest maturity. TSS, total soluble solids.
Table 2
Infestation levels of Minnesota winegrapes by Drosophila suzukii in 2018 laboratory assays, summarized as percent D. suzukii infestations of larvae and/or pupae across the total berries screened from veraison to harvest, and mean total soluble solids (TSS) levels at harvest.

Vol 72 Issue 1