苹果有一种生理病害,其症状是果实皮孔变为褐色,皮孔周围有3～5mm宽的红色环。金冠品种感病最重,尤以树冠南面的果实表现明显。此病的发生可能与喷布某些有害物质有关。在一个探讨病因的试验中,以M9砧金冠苹果成年树,于9月26日用0.6％或4％硝酸钙、0.1％或0.6％克菌丹溶液单喷或混喷。果实于10月8日采收。4％硝酸 Apple has a physiological disease, the symptoms of the skin becomes brown leather, skin around 3 ~ 5mm wide red ring. Golden Delicious varieties most susceptible, especially in the crown of the south fruit obvious. The incidence of this disease may be related to the spraying of certain harmful substances. In a test to explore the cause, the M9 Anvil Golden Delicious Apple adult tree, on September 26 with 0.6% or 4% calcium nitrate, 0.1% or 0.6% coumarin solution single spray or mixed spray. The fruit was harvested on October 8. 4% nitric acid