Department of Horticulture Industry, Wonkwang University1
Institute of Life Science and Natural Resources, Wonkwang University2
This study was conducted to identify the air temperature factors that affect leafing date of mulberry (Morus alba) in Buan, Jeonbuk province. Over the period from 2009 to 2014, the leafing date averaged April 24 (114 Julian days). The earliest leafing date was April 12, in 2014, and the latest leafing date was May 2, in 2011. Yearly variations of daily mean temperature (DMT) and daily maximum temperature (DMxT) were high in the last part of March. There were highly negative correlations between leafing date and degree days of accumulated DMT above 0, 5, and 10°C in the period from March 1 to April 10. Linear regression equations for estimating the leafing date were y = 153.8 - 0.1886 x (r2 = 0.965**) and y = 126.2 - 0.2246 x (r2 = 0.825*) for the degree days of accumulated DMT above 5°C in the period from March 1 to April 10 and the last part of March, respectively. Therefore, leafing date of mulberry, which is important for popcorn disease control, is 96.5% predicted by degree days of accumulated DMT above 5°C in the periods from March 1 to April 10.
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