Author : Pramote Saiwichian

Summary : A study of the effects of light and frequency of watering on damping-off of Kaatoan bangkal (Anthocephalus chinensis (Lamb.) (Rich.ex.Walp) seedlings was conducted in the Central Forest Experiment Station (CFES) nursery, UPLB College of Forestry, from Feb 8,1975 to Apr 25, 1975. Seedflats were exposed to 35,65 and 100 percent light intensity and they were watered at intervals of 2,4 and 6 days. The number of days from sowing to the first sign of damping-off, the rate of spread or the number of days damping-off took to spread over the whole seedflat, and the number of seedlings left alive after damping-off has spread over the whole seedflat were determined. Exposures of seedflat from 35 to 100 percent sunlight and watering once every 2 to 6 days both did not affect the beginning of damping-off. The spread of damping-off over the whole seedflat became faster with exposure to reduced light intensity except when the seedflat was watered once every 6 days in which case there was no effect of light intensity. Watering once every 6 days resulted in a faster spread of disease than watering once every 2 or 4 days. The number of seedlings left alive after damping-off had spread over the whole seedflat, was also reduced by exposure to full sunlight and watering only once every 6 days.