1964年春,兴宁县园艺农场的大面积柑桔园里,出现了两种异常的情况; 第一种情况是:有不少蕉柑,在春梢抽吐前,叶片向外反卷,以上年秋梢为甚,上年夏梢和春梢比较轻微。叶片反卷严重的植株吐梢迟且少,有丛状现象。叶片反卷特别严重的叶面主脉和侧脉严重破裂,叶片变为古铜色,甚至黄色而脱落,有 The spring of 1964, Xingning County, horticultural farms citrus garden area, there have been two kinds of abnormal situation; the first case is: there are a lot of banana, in the shoot before the vomiting, the leaf out of reeling, last autumn Shoots even more, last year’s summer shoot and spring shoot relatively minor. Leaf blade anti-roll plant spit tip less late, there are plexiform phenomenon. Leaf anti-roll particularly serious main folds and lateral veins serious rupture, the leaves become bronze, or even yellow off, there