Abundance of phytoseiid mites on Vitis species: effects of leaf hairs, domatia, prey abundance and plant phylogeny

摘要: We observed the number of predatory mites (Phytoseiidae:Typhlodromus caudiglans) on foliage 20 North American species grapes (Vitis spp) plus domesticated EuropeanVitis vinifera, all grown in a common garden. found relatively few phytophagous mites. The numbers were not correlated with plant characteristics that we measured. approximately five times as many and these phytoseiid predators affected by availability prey. Similarly, phytoseiids unaffected gender and, hence, pollen, another source food. clustered according to taxonomic grouping tested species. Leaf surface explained over 25% variance phytoseiids. Numbers positively associated density vein hairs, bristles leaf axils, presence domatia. These results suggest sheltered habitats rather than food may limit grapevines.