Influence of leaf trichomes on predatory mite (Typhlodromus pyri) abundance in grape varieties
Abstract
Non-glandular leaf trichomes positively influence the abundance of many phytoseiid mites. We characterized the influence of grape leaf trichomes (domatia, hairs, and bristles) on Typhlodromus pyri Scheuten abundance over two years in a common garden planting of many grape varieties and 2 years of sampling in a commercial vineyard. In general, a lack of trichomes was associated with much lower predator numbers and in the case of Dechaunac, a cultivar with almost no trichomes, very few T. pyri were found. Phytoseiid abundance was best predicted by a model where domatia and hair had an additive effect (r 2 = 0.815). Over two years of sampling at a commercial vineyard there were T. pyri present on all of the 5 cultivars except Dechaunac. At the same time, European red mite prey were present on Dechaunac alone. These results suggest that on grape cultivars lacking leaf trichomes, T. pyri likely will not attain sufficient densities to provide biological control of European red mite, despite presence of the mite food source. The relationship between leaf trichomes and phytoseiid abundance that is observed at the scale of single vines in a garden planting appears to also be manifest at the scale of a commercial vineyard. Because persistence of predatory mites in or nearby the habitats of prey mites is important for effective mite biological control, leaf trichomes, through their influence on phytoseiid persistence, may be critical for successful mite biological control in some systems.
Keywords
Non-glandular trichomes Phytoseiid Domatia Biological controlNotes
Acknowledgments
Special thanks to Bill Srmack for allowing us to collect leaf samples from the National Clonal Germplasm Repository vineyard in Geneva, NY. Joe Ogrodnick provided photographic expertise. Karen Wentworth, Amy Loveland, Carol Herring, Milo Bonacci, and Jeanie McCann provided laboratory assistance. A special thanks to Amy Roda for guidance and support. This work was supported by the NJ Shaulis Scholarship in viticulture and the New York State Wine and Grape Foundation.
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