Influence of Air Temperature during Midsummer on Fruit Sunburn Occurrence in 'Fuji'/M.9 Apple Tree

한여름 기온이 '후지'/M.9 사과나무의 과실 일소증상 발생에 미치는 영향

  • Published : 2009.12.30


This study was carried out to investigate the effects of air temperature during midsummer on sunburn occurrence that had some problems recently on 'Fuji'/M.9 planting system in Korea. There was a positive relationship between sunburn incidence and accumulated days with high air temperature over $31^{\circ}C$, or accumulated total quantum per day. 'Fuji'/M.9 apple trees with relatively open canopies, compared to 'Fuji'/M.26, were more susceptible to sunburn injury because the fruit was more exposed to sunlight. In 'Fuji'/M.9 apple trees, those that were poor in vigor or with short bourse shoot length were more susceptible to sunburn injury. Sunburn incidence was affected by neither regions nor row orientations. Sunburn was observed most often on the fruits on the south and west sides of the trees. The reason was due to high skin temperature of the fruits reaching $40{\sim}45^{\circ}C$ under full sunlight.


Malus domestica Borkh.;Fruit skin temperature;High temperature;Rootstock;Row orientation


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