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目前,日本农药开发研究中除草剂的比重占45%,而杀虫剂为32%,杀菌剂为23%,这说明日本对杂草防除相当重视。同时,也加强对增效剂,解毒剂和混合剂的开发。杂草防除的研究在日本进展很快。日本稻田杂草种类近200种,其中害草约100种,近年来多年生杂草增多。稻田杂草的防除以施药二次为多,多数在移栽前或移栽后早期撒布除草剂,少数后期施药。旱田杂草种类约有300种,施用除草剂1～2次,主要在小麦、玉米、甘蔗、大豆、蔬菜、甜菜等作物田。据日本植物调节剂研究会的资料报道,
At present, the proportion of herbicides in Japan’s pesticide development and research accounts for 45%, while that of pesticides is 32% and that of bactericides is 23%. This shows that Japan attaches great importance to weed control. At the same time, the development of synergists, antidotes and mixtures is also intensified. Weed control studies have progressed rapidly in Japan. Nearly 200 species of Japanese paddy weeds, including about 100 kinds of weeds, perennial weeds in recent years increased. Control of weeds in rice to pesticide secondary as much as most of the transplanting or transplanting early spreading herbicides, a small number of late application. There are about 300 kinds of weeds in weeds and 1 to 2 times of application of herbicides, mainly in crop fields such as wheat, corn, sugar cane, soybean, vegetables and sugar beet. According to the Japan Plant Regulator Research Association data reports,