Summary: The objectives of this project were: 1. Determine if certain desirable horticultural attributes (early ripening) associated with 'Yataka' clones in commercial plantings are due to graft transmissible agents or due to other causes. 2. Determine if tree vigor of ‘Fuji’ trees can be beneficially controlled by virus inoculations. 3. Determine horticulture and disease effects of virus isolates separated by thermo-therapy from apple green crinkle and apple rubbery wood diseased sources. Since all trees in this block are expected to fruit in 2004, final association between virus and green crinkle disease will be complete.
