Resistance of the problematic grass weeds to some commonly used herbicides in canola (Brassica napus L.) fields in three provinces of Iran

Document Type : Research Paper

Authors

1 Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO)

2 Department of Agronomy, College of Agriculture, Tarbiat Modares U

3 niversity, Tehran, Iran

Abstract

This study was conducted to investigate the resistance of problematic grass weeds including winter wild oat (Avena ludoviciana), annual ryegrass (Lolium rigidum) and canary grass (Phalari minor) to commonly used herbicides in canola fields at Iranian Research Institute of Plant Protection in 2019 in a completely randomized design with four repetitions. For this purpose, 29 accessions of wild oat, 15 accessions of ryegrass and 8 accessions of canary grass were collected from canola fields located in Fars, Mazandaran, and Ardabil provinces. After growing under controlled conditions, seedlings of the weed species were exposed to the recommended doses of haloxyfop-R-methyl, sethoxydim, cycloxydim and clethodim herbicides at 2-3 leaf stage. Fresh and dry weights and survival percentage of plants were measured four weeks after treatment. Based on fresh weight reduction, 86.7%, 66.7% and 60% of annual ryegrass accessions were resistant to haloxyfop-R-methyl, sethoxydim and cycloxydim, respectively. Also, 25% of canary grass accessions were resistant to haloxyfop-R-methyl, based on fresh weight loss, while 12.5% of accessions were classified as suspected resistant to sethoxydim. Based on fresh weight reduction, 31% of 29 wild oat accessions were resistant to halloxypop-R-methyl and only one accession was resistant to clethodim. The occurrence of definite resistance in other wild oat accessions to the three dim herbicides was not confirmed. Generally, resistance of narrow-leaved weeds to some commonly used graminicides in broadleaf crops such as canola has been developed; Therefore, it is recommended to restrict application of herbicides with the same mechanism of action, while following crop rotation.

Keywords

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Iranian Journal of Weed Science
Volume 17, Issue 2
September 2021
Pages 79-98

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