Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 51 4 2020 12 21 Tracing the resistance to acetolactate synthase and synthetic auxins in little mallow (Malva parviflora L.) in wheat fields of Khuzestan province Tracing the resistance to acetolactate synthase and synthetic auxins in little mallow (Malva parviflora L.) in wheat fields of Khuzestan province 13 23 79277 10.22059/ijfcs.2020.254444.654458 FA Ali Kamaei Department of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Bavi, Khuzestan, Iran Elham Elahifard Department of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan, Mollasani, Bavi, Khuzestan, Iran 0000-0002-8982-9602 Abdul-Reza Siahpoosh Department of Plant Production and Genetics, Faculty of Agriculture, Khuzestan Agricultural Sciences and Natural Resources University, Mollasani, Bavi, Khuzestan, Iran Mohammad Hossein Tabib Plant Protection Management Administration, Jahad Agricultural Organization of Khuzestan, Ahvaz, Iran Journal Article 2018 05 30 Little mallow is a common weed in wheat fields of Khuzestan province, which is often controlled by tribenuron-methyl and 2,4-D+MCPA, from acetolactae synthase inhibitors and synthetic auxin herbicides. Recently, there have been some reports about poor control of this plant with these herbicides, especially in wheat fields of Southern Khuzestan. Therefore, due to the lack of research on the occurance of mallow resistance to the mentioned herbicides and to estimate the resistance level among the mallow populations, little mallow seeds were collected from wheat fields in southern Khuzestan and whole plant assays were carried out in the pot. Dose-response results revealed that the resistance factor (RF) based on fresh weight for resistant (R) populations to tribenuron-methyl, and 2,4-D+MCPA were 2.05-10.11 and 2.51-3.09 fold higher than susceptible (S) plant, respectively. Similarly, the resistance factor (RF) based on survival plants for resistant (R) populations to tribenuron-methyl, and 2, 4-D+MCPA were 2.14-34.93 and 1.99-2.91 fold higher than susceptible (S) plant, respectively. The E population, however, was not significantly different from S population in response to tribenuron-methyl. Little mallow is a common weed in wheat fields of Khuzestan province, which is often controlled by tribenuron-methyl and 2,4-D+MCPA, from acetolactae synthase inhibitors and synthetic auxin herbicides. Recently, there have been some reports about poor control of this plant with these herbicides, especially in wheat fields of Southern Khuzestan. Therefore, due to the lack of research on the occurance of mallow resistance to the mentioned herbicides and to estimate the resistance level among the mallow populations, little mallow seeds were collected from wheat fields in southern Khuzestan and whole plant assays were carried out in the pot. Dose-response results revealed that the resistance factor (RF) based on fresh weight for resistant (R) populations to tribenuron-methyl, and 2,4-D+MCPA were 2.05-10.11 and 2.51-3.09 fold higher than susceptible (S) plant, respectively. Similarly, the resistance factor (RF) based on survival plants for resistant (R) populations to tribenuron-methyl, and 2, 4-D+MCPA were 2.14-34.93 and 1.99-2.91 fold higher than susceptible (S) plant, respectively. The E population, however, was not significantly different from S population in response to tribenuron-methyl. https://ijfcs.ut.ac.ir/article_79277_adf92f906a68a0e05462f292f17fe324.pdf