鸭梨贮藏时发生黑心病的原因河北任丘市职教中心（０６２５５０）牛尊敬鸭梨风味醇厚，品质优良。但在贮藏过程中，果心极易褐变，欲称黑心病，因而降低了商品的价值，损失严重。引起鸭梨黑心病的原因有以下几个方面：一、过度成熟如果鸭梨采收过晚，它的生理机能已达到高... Reasons for the occurrence of black heart disease during the storage of Yali Renqiu City Vocational Education Center (062550) Beef reverence Yali pear mellow, high quality. However, in the course of storage, the heart of fruit is extremely easy to be brownish, so to say black heart disease, thus reducing the value of the goods and causing serious losses. Cause pear black heart disease for the following reasons: First, the over-ripe If the pear harvest too late, its physiological function has reached high ...