Prediction of Herbicide-resistant Weed Dominance Occurred in Major Rice Paddy Fields of Gyeongsangbuk-do Province in Korea

Since then over 347 resistant weed biotypes have been reported; virtually all major modes of action of herbicide have certain weeds that have developed resistance to them. Agronomic weed management is increasingly difficult and costly due to the apparent increase in the rate of development of weed resistance to herbicides and the lack of development of new modes of herbicide action. No new class of herbicides has been registered in the Korea. In potentially increasing weeds to resistant to herbicides, some data were collected at twenties two city and county in Gyeongsangbuk-do.