Abstract
As a series of studies on chemical emasculation, the results of repeated applications of Dalapon were represented. Sweet pepper, cultivar., Shosuke, was used as the test plant. The plants were sprayed six times with aqueous solutions ranging in concentration from 100 to 300ppm at one week intervals. Repeated applications markedly reduced injury to foliage and continued a suppression of anther dehiscence for a longer period than a single application. On the other hand, these concentrations caused an abnormal expansion of the ovary. A counterplan to reduce this toxic effect was discussed. A screening test of some Dalapon homologues was also investigated in this paper. The results indicate that sodium salts of chlorinated lower fatty acids generally induce the suppressive effect on anther dehiscence. Among these substances, the effect of a-chloropropionate was as reliable as Dalapon.
