Resistance to Twospotted Spider Mite and Strawberry Aphid in Fragaria chiloensis, F. virginiana, and F. ×ananassa Clones

Abstract

More than 170 clones of Fragari × ananassa Duch., F. chiloensis (L.) Duch., and F. virginiana Duch. were tested for resistance to the twospotted spider mite ( Tetranychus urticae Koch). Twenty-seven clones had >75% fewer mites than did F. ×ananassa `Totem', a susceptible clone. About two-thirds of the clones also were tested for resistance to the strawberry aphid [ Chaetosiphon fragaefolii (Cockerell)]. Survival and reproduction was significantly lower on two clones each of F. × ananassa and F. virginiana than on `Totem'.