Screening of herbicides for weed management in quinoa (Chenopodium quinoa Willd.) - The first report from India
2025
Lavanya, S | Thavaprakaash, N | Radhamani, S | Janaki, P | Djanaguiraman, M | Sangeetha, S P
Weed management without herbicide poses a significant challenge in crop production, especially for emerging crops like quinoa, which are highly sensitive to many herbicides. Identifying suitable herbicides and determining their optimal doses are critical steps for enhancing quinoa cultivation. To address this, two screening experiments followed by a conformity study were conducted in pots at Tamil Nadu Agricultural University, Coimbatore in 2024. The study evaluated eight pre-emergence, six early post-emergence and three post-emergence herbicides, each applied at 100% and 75% of the recommended dose (a total of 34 treatments) and compared their effects against a non-treated control (no herbicide). The experiments were carried out in a completely randomized design. Screening results indicated that pre-emergence applications of pretilachlor, butachlor, bensulfuron methyl + pretilachlor and pyrazosulfuron ethyl at 100% recommended doses significantly reduced total weed density and dry weight while enhancing quinoa growth parameters, with minimal phytotoxic effects. In the conformity study, only the full recommended doses of pretilachlor (750 g ha-1), butachlor (1000 g ha-1) and bensulfuron methyl + pretilachlor (660 g ha-1) consistently reduced weed density and dry weight effectively. However, phytotoxicity evaluations revealed that both the 100 and 75% doses of atrazine, metribuzin, oxyfluorfen, tembotrione, topramezone, pendimethalin, imazethapyr, triafamone + ethoxysulfuron, penoxsulam + cyhalofop butyl, pyrazosulfuron ethyl, bispyribac sodium, fomesafen + fluzifop-p-butyl, quizalofop ethyl and pyrithiobac sodium were unsuitable for quinoa due to their high phytotoxicity.
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