Resistance of three grapevine cultivars to Grape Erineum Mite, Colomerus vitis (Acari: Eriophyidae), in field conditions

The grape erineum mite (gem), colomerus vitis (pagenstecher) (acari: eriophyidae), is a serious pest of vine (vitis vinifera l.) in western iran. host plant resistance has not been explored as a method for its integrated mite management. in this study, gemvineinteractions and the biochemical features potentially related to vine resistance/sensitiveness have been investigated on fakhri, gazne and white thompson seedlesscultivated in field conditions in western iran. the lowest and highest mite densities werefound on leaves of white thompson seedless and gazne, respectively. as expected,reduction of healthy leaf area, increase of leaf weight, shortening of shoots and erineaformation were more relevant on the most infested gazne; white thompson seedlessappeared to be affected by gem infestation. the diameter of grape berries and theirweight did not differ significantly between infested and control plants on all cultivars.mite density appeared to be negatively related to the sugar content only for gaznegrape. the amount of the leaf waxes was highest in white thompson seedless on whichthe lowest mite density, the lowest percentage of erinea and largest healthy leaf areaswere detected. carbohydrate content of leaves was the lowest on the least mite-infestedthomson seedless and the highest on the most infested gazne, while phenols decreasedin gazne after mite infestation.