The suggestion that modern pasture cultivars persist less well than their predecessors is not supported by facts. However in some regions there is a crisis in farmer experience of persistence of ryegrass pastures, and ryegrass breeding can contribute to a resolution. This paper considers the turnover of tillers in a pasture, the population structure of a grass sward and the involvement of endop...

Drosophila suzukii is threatening soft fruit production worldwide due to the females' ability to pierce through the intact skin of ripe fruits and lay eggs inside. Larval consumption and the associated microbial infection cause rapid fruit degradation, thus drastic yield and economic loss. Cultivars that limit the proliferation of flies may be ideal to counter this pest; however, they have not ...

Selective amplification of microsatellite polymorphic loci (SAMPL) markers was used to analyze the genetic relationships between 22 elite cultivars of sweet potato [Ipomoea batatas (L.) Lam.] used in polycross breeding in Taiwan. These elite cultivars included varieties introduced from China and Japan and landraces from Taiwan as well as cultivars derived either from hybrid or polycross breedin...

Perennial ryegrass is the most abundant grass species in temperate climates. An increased herbage intake of dairy cows by breeding new cultivars could have a large potential impact on agriculture. The effects of cultivars on sward structure, nutritive value, physical characteristics and disease resistance of perennial ryegrass are discussed. Cultivar differences were found in several studies fo...

Received for publication 22 May 2000. I would like to acknowledge the contributions of Angela Anderson and Rengong Meng, whose MS thesis research at Oregon State Univ. contributed to this paper; Kirsten Wennstrom (USDA–ARS/Oregon State Univ.) for overseeing the maintenance of the plant material and crosses discussed; Hugh Daubeny [Agriculture and Agri-Foods Canada, Agassiz, B.C. (retired)], Ric...

Root holoparasitic angiosperms, like Orobanche spp, completely lack chlorophyll and totally depend on their host for their supply of nutrients. O. crenata is a severe constraint to the cultivation of legumes and breeding for resistance remains the most economical, feasible, and environmentally friendly method of control. Due to the lack of resistance in commercial pea cultivars, the use of wild...

Extending the range of Osmanthus species into more cold-hardy climates would open new opportunities for adoption and use these by growers, landscapers, public. Breeding improvement is hindered few available cultivars a lack female or perfect flowers. The objectives this study were to evaluate floral morphology pollination biology in U.S. market. Thirty-three genotypes representing four evaluate...