No abstract

No abstract

Bacterial soft rot caused by Erwinia carotovora subsp. carotovora is a major disease in Zantedeschia spp. Chemicals or modified cultivation methods only provide partial control of this disease. So highly resistant cultivars are needed to produce high quality calla flowers. Experiments were conducted to screen for Erwinia resistance in Zantedeschia spp. by a leaf disk test. To determine variation for aggressiveness, 20 Erwinia isolates collected from sites at Jeonju, Pyeongchang, and Suwon were inoculated onto five Zantedeschia cultivars: including 'Wedding March' as a resistant genotype, 'Little Suzy' as a moderately resistant genotype, and 'Chianti' as a susceptible genotype. Ecc NHRI-3 and Ecc NHRI-6 were the most virulent isolates among the 20 isolates of Erwinia carotovora subsp. carotovora tested. Within 25 Zantedeschia genotypes, including Z. rehmannii and Z. albomaculata, variation of Erwinia resistance ranged from almost completely resistant to extremely susceptible. 'Wedding March' was the most resistant, while 'Galaxy' was the most susceptible.

This study investigated trends in lily (Lilium hybrids) cultivars and challenges for growing cut lily flowers using a survey of producers in the South Korean lily industry. A questionnaire requested information on various topics including the total growing area, length of farming experience, cultivars grown, factors considered when purchasing bulbs, cultivation systems, horticultural practices, disease and pest problems, and horticultural problems. The survey targeted the membership of the Korea Lily Producer Association and the number of respondents corresponded to 43% of all lily farmers in the country. Oriental-Trumpet (OT) hybrid ‘Yelloween’ and Oriental hybrids ‘Siberia’, ‘Medusa’, and ‘Sorbonne’ were mainly cultivated in South Korea. The main flower colors were yellow, white, and pink. Factors considered in choosing cultivars were the prices of bulbs and cut flowers affecting income of the farm. More than 90% of respondents used soil culture in a greenhouse to grow cut flowers. There were various horticultural practices used from planting to harvest. The main pests harming bulb and flower productivity were fungus gnat (Bradysia difformis) and bulb mite (Rhizoglyphus robini), and the most common horticultural problem was leaf scorch. Overall, the survey suggested that the stable production of lily bulb with low cost and high quality was required and practical techniques should be developed for increasing the cut lily production efficiency. In addition, the pests, diseases, and horticultural problems in the given local environmental conditions should be considered when breeding new cultivars and developing production technology.

The cross was made between '03B1-23 ' and 'Sei-Monaco in 2005'. After the evaluation of the characteristics under shade culture in summer and retarding culture in spring and consecutive selection from 2006 to 2008, 'Secret Pink' was selected finality. The natural flowering time of 'Secret Pink' was the middle of October, and it is possible to flower all year round by shade and light culture. It has single type flowers with pink petals. The growth of plant was very vigorous and response time was 6.5 weeks. The diameter of flower was 6.7 cm. Number of flowers per stem and petals per flower were 14.5 and 25, respectively. Days to flowering under the short day treatment was about 50 and its vase life was 25.5 days in autumn season.