Activity of Thiosemicarbazides for the Control of Bacterial Leaf Blight of Rice

Abstract

Thiosemicarbazides were examined for control effect against bacterial leaf blight of rice caused by Xanthomonas oryzae as a root application. The 1-lower alkyl thiosemicarbazides were found to be fairly effective against the disease. Significant disease control activity in this series was found only for 1-methylthiosemicarbazide. 1-Methylthiosemicarbazide was able to control the disease as a root application at extremely low dosage whether it was applied preventively or curatively and its duration of effect was fairly long. Any phytotoxicity was not observed on rice plant when the chemical was applied at high dosage twenty times as much as enough dosage to control the disease. It was able to use mixing with other insecticide, fungicide and herbicides as a paddy water application. However, 1-methylthiosemicarbazide showed no control effect as a foliar spray and exhibited no antibacterial activity against Xanthomonas oryzae on agar medium. © 1976, Pesticide Science Society of Japan. All rights reserved.