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正确地判定灰色叶属于哪一个类型,对于采取相应性的措施,来防止它的发生是非常重要的。否则,制定的措施将是无效的,相反还会助长灰色叶的发生。本文虽然叙述了Ⅰ、Ⅱ两型灰色叶的判定方法,但是,关于灰色叶发生的原因和防止的相应措施等,本杂志第72号(76年,宇野良夫等)和第81号(79年,鹤田繁)作了详细介绍,务必清参阅。Ⅰ型灰色叶的检验法1、外观检验法灰色叶发生的叶位,基本限于烟株的脚叶和腰叶。灰色叶表现片薄,质软(吸湿性高)、
Correctly determine which type of gray leaf belongs to, it is very important to take measures to prevent it from happening. Otherwise, the measures formulated will be ineffective, on the contrary will contribute to the occurrence of gray leaves. Although the method for judging the gray leaves of type I and II is described in this paper, the causes of gray leaves and the corresponding measures to prevent them are described in Journal of this journal No. 72 (76 years, Yukio UF etc.) and No. 81 (79 years , Tsuruta Fan) made a detailed introduction, be sure to refer to Qing. Ⅰ-type gray leaf test method 1, the appearance of gray leaf test the location of the leaves, basically limited to tobacco plant foot and waist leaf. Gray leaf performance thin, soft (high hygroscopicity),