1987 Volume 22 Issue 1 Pages 72-77
It was considered that the leaf damage observed on pear leaves was caused by iodine emitted from a iodine refinery. Therefore, we have confirmed this by exposing pear plants to artificially emitted iodine gas in a chamber. The characteristics of iodine gas sorption by pear leaves were also clarified. Experimental results are obtained as follows:
(1) The main observable damage was brown spots on leaves. Furthermore, the injured leaves became yellow or orange-color, and finally fell down at early growth stage.
(2) The extent of leaf damage differed depending on pear cultivars: Kosui and Hakko were sensitive, while Chojuro was resistant.
(3) Gas sorption rate of iodine by pear leaves was constant at the constant concentration of iodine gas, and that rate was increased along-with the increase of iodine gas concentration.
