Abstract
"Benihomare" in an excellent variety for making black tea. It grows quite well during young plant, but after ten years or so when it is full grown, it is often attacked by "Edagare" disease, by which its branches are withered. On investigating the causes of this disease, the following facts have been discovered : 1) The amount of transpired water surpassing the amount of water absorbed by its rootlets. 2) This happend because of the following two facts (a) the respiratory trouble of the root and (b) the low temperature of the soil. 3) In consequence of this unbalance of water in the plant body. The tracheid turns into vessel and the transpiration from the surface of the leaves becomes so free that more supply of water is naturally required. The rootlets, being unable to meet this demand of water, the branches begin to wither. Thus "Edagare" disease appears
