Abstract
The sugi (Cryptomeria japonica) pollinosis becomes representative allergic disease in early spring in Japan. However, effective treatment for the sugi pollinosis and countermeasure against pollen of C. japonica at its source have not been developed in a practical sense. In this paper, the research aiming to prevent dispersion of pollen of the C. japonica is introduced on application and practical application to the field from the laboratory using the growth regulation of the plant. We found that formation of male flower bud in C. japonica could be suppressed by TNE, since the 3 β-hydroxylase is inhibited by the action of Trinexysapac ethyl, TNE.
