BLUEBERRY RESEARCH IN NORTH AMERICA
About 2/3 of the blueberry land in North America is in the lowbush species Vaccinium angustifolium, but the highbush blueberry V. corymbosum accounts for more than 2/3 of the total production. The rabbiteye blueberry, V. ashei, is gaining in importance in the southeastern United States and is 5–10% of the total blueberry area. Most of the blueberry research centers around cultivar development, pruning, nutrition, irrigation and pest resistance. A considerable effort is being made to transfer genes from wild species into cultivated types to broaden temperature and soil adaptations. The nature of self-infertility in the various species is being explored and the nutritional requirements of all three species are being "fine-tuned". Serious attempts are also being made to develop cultivars with later bloom dates, more cold tolerance, lower chilling requirements and greater resistance to several diseases and pests.
Hancock, J.F. (1989). BLUEBERRY RESEARCH IN NORTH AMERICA. Acta Hortic. 241, 19-30