portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px"> 症状多出现在夏季新梢生长叶。叶面出现大小不均的黄色斑纹，造成叶面皱缩，影响树势。  portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">        病原可能是病毒。  portant; font: 14px/21px Simsun; white-space: normal; float: none; letter-spacing: normal; color: rgb(0,0,0); word-spacing: 0px; -webkit-text-stroke-width: 0px">        传染途径、预防方法尚待调查、了解。