The study was conducted to obtain the basic information for extending the harvest season and selecting superior cultivars of mango. For the purposes, various cultivars were imported and cultivated in greenhouse condition, Korea. The periods of flowering and fruit maturity and fruit qualities among cultivars were investigated under greenhouse condition. As the early variety, the harvest time of ‘Carrie’ and ‘Glenn’ was fastest as June 3 based on harvest time and cumulative temperature. ‘Kent’, ‘Philippine’, ‘Irwin’, ‘Choc-anon’, and ‘Fairchild’ as the early variety were harvested from June 8 to June 13. ‘Zill’, ‘Florigon’, ‘Alphonso’, ‘Mallika’, ‘Kensington Pride’, ‘Bailey’s Marvel’, and ‘Pinkering’ as midseason cultivar were harvested from June 15 to June 23. ‘Dot’, ‘Keitt’, ‘Gold Nugget’, and ‘Lancetilla’ as late ripening variety were harvested from July 5 to July 10. The fruit weights of ‘Keitt’ and ‘Kent’ were more than 650g and those of ‘Fairchild’ and ‘Lancetilla’ were less than 200g. The fruit weights of other cultivars were from 300 to 400g. The soluble solid contents of ‘Zill’, ‘Irwin’, ‘Kent’ and ‘Glenn’ were almost 15Brix and those of other cultivars were higher than that of ‘Irwin’. The soluble solid contents of ‘Pinkering’, ‘Philippine’, ‘Lancetilla’, ‘Dot’, and ‘Alphonso’ were about 20Brix and flavors of those cultivars are excellent. The acid contents of cultivars were investigated from 0.2 to 0.4% but that of ‘Fairchild’ was 0.8%.

‘Sweet Dream’(Vitis complex), a new triploid seedless grape cultivar, is developed from the grape breeding program at Gangwondo Agricultural Research and Extension Services in 2009. ‘Sweet Dream’ was obtained from a cross ‘Honey Black’(Vitis complex) and ‘Campbell Early’(Vitis labrusca), a diploid x tetraploid grape cultivar. Characteristics of fruits and vines in ‘Sweet Dream’ were observed from 2006 to 2008, and ‘Sweet Dream’ was finally selected in 2009. Its optimum harvest time in Chuncheon is September 11, 12 days later than ‘Campbell Early’. ‘Sweet Dream’ has strong vine vigor and moderate freezing tolerance, with no bud damage occurring during winter in Chuncheon. The average weight of a cluster is 440g, and its average soluble solids concentration is 16.4 °Brix. It is seedless and has larger fruit size and better fruit quality than ‘Campbell Early’. It, therefore, is expected that introduction of ‘Sweet Dream’ could contribute to the diversification and gentrification of Korean grape cultivars (Registration No. 4359).