THIOBENCARB PHYTOTOXICITY TO RICE AS AFFECTED BY METHOD OF NAPHTHALIC ANHYDRIDE APPLICATION

Abstract

The phytotoxicity of thiobencarb (S-4-chlorobenzyl diethylthiocarbamate) to IR-36 and RD-19 rice cultivars using different methods of NA (1, 8-naphthalic anhydride) application was evaluated under greenhouse conditions. IR-36 cultivar showed greater response to the method of NA application than RD-19. Seed treatment with the antidote provided the best protection to IR-36 seedlings. In RD-19 cultivar, either broadcast application on soil surface or surface application followed by incorporation into the soil was as effective as seed treatment in decreasing thiobencarb phytotoxicity. This cultivar appeared to require less NA to obtain protection, and this requirement could always be met in any method of application. The minimum NA requirement for IR-36 was probably higher, and seed treatment was the only method which satisfied such requirement.