First report of Amaranthus viridis resistance to herbicides

Abstract

-Due to the limited number of herbicides registered for the control of dicot weeds in cotton crops, ALS inhibitors have been used on an intensive and recurrent basis. Given that, cases of poor weed control have been described after application of these herbicides in the main cotton producing areas in Brazil, the purpose of the present work was to evaluate the occurrence of resistance to ALS herbicides in Amaranthus viridis biotypes from those areas. Dose-response curves were prepared after pre-emergence applications of trifloxysulfuron-sodium (0; 1.8; 3.7; 7.5; 15 and 30 g ha -1) and pyrithiobac-sodium (0; 35; 70; 140; 280 and 560 g ha ), equivalent to 0, ¼, ½, 1, 2 and 4 times the recommended commercial rates. The selection of trifloxysulfuron-sodium resistant biotypes of A. viridis was confirmed in samples from Bahia (BA 7, BA 8, BA 9 and BA 11). However, no resistance to pyrithiobacsodium was found for biotypes either from Bahia or from Mato Grosso do Sul.Keywords: trifloxysulfuron-sodium, pyrithiobac-sodium, slender amaranth, ALS-inhibiting herbicides. trifloxysulfuron-sodium (0,0; 1,8; 3,7; 7,5; 15,0 e 30,0 g ha -1 ) e pyrithiobac-sodium (0,0; 35,0; 70,0; 140,0; 280,0 e 560,0 g ha -1 RESUMO -Devido ao limitado número de herbicidas registrados para o controle de dicotiledôneas no cultivo do algodoeiro, herbicidas inibidores da ALS tem sido utilizados de forma intensiva e recorrente. Em função de falhas de controle observadas com estes produtos nas principais áreas de produção desta cultura no Brasil, o presente trabalho teve por objetivo identificar a possível ocorrência de resistência a estes herbicidas em biótipos de Amaranthus viridis provenientes destas áreas. Foram elaboradas curvas de dose-resposta após aplicações em pré-emergência dos herbicidas

Multiple-and Cross-Resistance of Amaranthus retroflexus to Acetolactate Synthase (ALS) and Photosystem II (PSII) Inhibiting Herbicides in Preemergence

“…In Brazil, the most recent cases include A. retroflexus resistant to protoporphyrinogen oxidase (PPO) inhibitors (Heap, 2019) and A. palmeri, simultaneously resistant to glyphosate and ALS inhibitors (Gonçalves Netto et al, 2016). In cotton fields, A. retroflexus populations resistant to trifloxysulfuron-sodium and pyrithiobac-sodium were found (Francischini et al, 2014b) as well as A. viridis resistant to trifloxysulfuron-sodium (Francischini et al, 2014a), applied in postemergence.…”

Characterization of Biological Resistance and Successful Drug Resistance Control in Medicine

“…More specifically, and to illustrate with examples, resistance of the tomato plant to phyto-pathogens is known to occur [45]: a case of plant resistance to natural chemicals of animal origin; resistance of plants to molecular isolate forms of herbicides is known to occur [46]: a case of plant resistance to artificial chemicals of human origin; resistance of insects to molecular isolate forms of insecticides is known to occur, this type having been occurring since 1908, from the San Jose fruit pest Quadraspidiotus perniciosus to lime sulfur as a chemical agent [47,48]—a case of resistance from an animal organism to artificial chemicals of human origin—and, finally, resistance of the Helicoverpa zea bollworm to the cotton plant is also known to occur [49]: a case of resistance from an animal organism to natural chemicals of plant origin. Furthermore, resistance within the animal kingdom proper, as illustrated by resistance of animal pests such as rats to molecular isolate forms of pesticides, also occurs in agriculture and is a familiar challenge.…”

Amaranthaceae plants of Israel and Palestine: Medicinal activities and unique compounds

“…426 And like other plants of this genus, it has remarkable resistance to herbicides. 427 But despite that, in some regions in the world, it is cultivated mainly as a protein source. 428 To conclude this part, we will cite two interesting reports related to Amaranthus viridis.…”