Impact of Adult <i>Popillia japonica</i> (Coleoptera: Scarabaeidae) Foliar Feeding Injury on Fruit Yield and Quality of a Temperate, Cold-Hardy Wine Grape, 'Frontenac'.

Phenolic compound measurements for the tannin index alone did not show significant differences across treatments [ F (4, 12) = 2.883, P = 0.069]; however, we observed a decreasing trend in tannin values as beetle density increased.

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All pH values in 2020 were within the recommended threshold, but we still observed a negative trend for pH values as percent defoliation increased.

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For example, looking specifically at the tannin measurements, while it may not be statistically significant, we see a numerical trend for a decrease in tannin with the increase in beetle density treatments.

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