在夏秋之际的苹果园中,常常看到果实累累的枝头上,挂着一些凸凹不平,红一块、绿一块斑斑点点的“花脸”果实。据科学家研究,这些“花脸”苹果是由一种病毒引起的。这种病毒,长期潜伏在梨树上。如果苹果树和梨树混栽,或者靠近梨园栽种,潜藏在梨树上的这种病原体,就会悄悄地传给苹果树。患病的苹果树,树势衰弱,叶子向背面弯曲,主脉皱缩曲折,光合效能大大降低,树体营养不足,结出的果实个 Apple orchards in the summer and autumn, often see the fruitful branches, hanging some uneven, red, green spots a little “flower face” fruit. According to scientists, these “painted face” apples are caused by a virus. This virus, long-term lurking in the pear tree. If apple trees and pear trees are planted, or planted close to pear orchards, the pathogen hidden in pear trees will be quietly passed to apple trees. Sick apple tree, tree fragility, the leaves bent to the back, shrinkage twists and turns of the main vein, greatly reduced photosynthetic efficiency, lack of tree nutrition, the fruit of a