Barnyard grass resistance to the herbicide Citadel in rice crops in Primorsky Krai. N.G. LUKACHEVA, A.V. KOSTYUK

Abstract

Barnyard grass resistance to the herbicide Citadel in rice crops in Primorsky Krai. N.G. LUKACHEVA, A.V. KOSTYUK (Far Eastern Research Institute of Plant Protection, Kamen-Rybolov village, Primorsky Krai).

The article substantiates the relevance of studying the emergence of resistance in weeds to herbicides as one of the most important reasons for a possible decrease in the effectiveness of drugs. Cases of resistance in bluegrass in modern conditions of rice cultivation have been established. Carried out annual surveys of rice-growing farms in Primorsky Krai, which had been using herbicide Citadel (D. V. penoxsulam, 25 g/l) for a long time. The results of studies of 2014–2018 on the basis of experimental base of the Far East Research Institute of Plant Protection in the conditions of the greenhouse are provided. It is proved that the resistance of the barnyard grass to the Citadel drug is a cross and develops in biotypes with previously  developed resistance to the Facet herbicide. The main reasons for the emergence of resistance are identified: the reproduction of stable populations; violation of drug application technologies; increase in the frequency of treatment. The current situation shows that the dominance of resistant biotypes of weeds in agrocenoses precludes the possibility of optimizing the phytosanitary situation using only a chemical method. Multivariate control tactics are required.