Abstract
To investigate the relationship between growing temperature and the outbreak of bacterial soft rot in Zantedeschia (calla), eight ornamental cultivars were planted in soil mix in plastic trays and placed in a growth cabinet under either a 32/27°C or a 25/20°C day/night temperature regime. The plants grown at 25/20°C showed a lower rate of soft rot infection, although variation was observed among cultivars. Tuber pieces of five cultivars were planted either on a rockwool cube (75×75× 50 mm high) or in soil mix in plastic pots as controls, and irrigated from the bottom. The plants grown on rockwool cubes showed a lower rate of soft rot infection than those in soil mix.
