DETECTION OF GLYPHOSATE-RESISTANT PALMER AMARANTH (Amaranthus palmeri) IN AGRICULTURAL AREAS OF MATO GROSSO, BRAZIL

CARVALHO, S. J. P.; GONÇALVES NETTO, A.; NICOLAI, M.; CAVENAGHI, A. L.; LÓPEZ-OVEJERO, R. F.; CHRISTOFFOLETI, P. J.

doi:10.1590/S0100-83582015000300020

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Articles • Planta daninha 33 (3) • Jul-Sep 2015 • https://doi.org/10.1590/S0100-83582015000300020 copy

DETECTION OF GLYPHOSATE-RESISTANT PALMER AMARANTH (Amaranthus palmeri) IN AGRICULTURAL AREAS OF MATO GROSSO, BRAZIL

Detecção de Caruru-Palmeri (Amaranthus palmeri) Resistente ao Herbicida Glyphosate em Áreas Agrícolas do Mato Grosso, Brasil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The recent introduction of Palmer amaranth (Amaranthus palmeri) in Brazilian agricultural areas may promote several changes on weed management, especially in no-till systems and in glyphosate-resistant crops, since glyphosate-resistant biotypes of A. palmeri have been frequently selected in other countries. Therefore, this research was developed in order to evaluate the glyphosate susceptibility of a Palmer amaranth biotype recently identified in the State of Mato Grosso, Brazil. For this purpose, glyphosate susceptibility of three Amaranthus biotypes was compared: A. hybridus var. patulus, collected in the State of Rio Grande do Sul - Brazil; A. hybridus var. patulus, collected in the State of São Paulo - Brazil; and A. palmeri, collected in the State of Mato Grosso - Brazil. Dose-response curves were generated for all biotypes, considering eight rates of glyphosate and six replicates. All the experiments were repeated twice. Both A. hybridus biotypes were satisfactorily controlled by glyphosate, demanding rates equal to or lower than 541.15 g a.e. ha^-1 for 80% control (LD₈₀). The A. palmeri biotype was not controlled by glyphosate in any of the assessments and required rates greater than 4,500 g a.e. ha^-1 to reach LD₈₀, which are economically and environmentally unacceptable. Comparison of the Brazilian A. palmeri biotype to the A. hybridus biotypes, as well as, to the results available in scientific international literature, led to the conclusion that the Brazilian Palmer amaranth biotype is resistant to glyphosate.

pigweeds; susceptibility; dose-response; management; control

Author	Site	Stage of application (height/leaves)	Evaluation timing	Results ^1/
Culpepper et al., 2006	Georgia - USA	7 - 10 cm	20 DAA^2/	LD₅₀ = 150 g ha^-1GR₅₀ = 90 g ha^-1
Norsworthy et al., 2008a^3/	Arkansas - USA	5 - 7 leaves	28 DAA	LD₅₀= 30 g ha^-1
Norsworthy et al., 2008b^3/	Arkansas - USA	5 - 7 leaves	28 DAA	LD₅₀ = 114 g ha^-1
Sosnoskie et al., 2011	Georgia - USA	10 - 15 cm	3 - 4 weeks	LD₅₀ = 91 g ha^-1
Nandula et al., 2012	Mississippi - USA	4 - 6 leaves	3 weeds	GR₅₀ = 90 g ha^-1
Mohseni-Moghadam et al., 2013	New Mexico - USA	3 - 4 leaves	16 DAA	GR₅₀ = 66 g ha^-1
General average values^3/	105.2 g ha^-1

Variable	Parameter	F	R²	LD or GR
Variable	Pmin	a	b	c			50	80
Amaranthus hy	bridus - Biot	ype collected	in the State	of Rio Grand	e do Sul - B	razil
Control	14 DAA^2/	--	102.332	242.422	-1.589	747.31*	0.997	80		235.57	541.15
	21 DAA	--	99.954	238.843	-1.948	219.69*	0.989	238.96	487.18
	28 DAA	--	99.632	251.886	-1.997	232.12*	0.989	252.82	509.01
Dry we	ight (%)	4.540	97.395	137.137	1.976	271.14*	0.995	146.70	318.92
		Amaranthu	s hybridus -	Biotype colle	cted in the S	tate of São P	aulo - Brazil
Control	14 DAA	--	101.505	207.534	-1.826	2754.60*	0.999	204.19	426.14
	21 DAA	--	101.700	189.621	-1.980	1029.20*	0.997	186.45	366.49
	28 DAA	--	101.138	170.545	-1.701	2284.46*	0.998	168.30	372.95
Dry we	ight (%)	4.349	97.595	142.011	2.481	760.59*	0.998	149.60	276.77
		Amaranthus	palmeri - Bi	otype collect	ed in the Stat	e of Mato G	rosso - Braz	il
Control	14 DAA	--	104.310	1900.068	-1.181	682.16*	0.993	1771.59	5209.45
	21 DAA	--	104.259	1773.982	-1.189	233.82*	0.979	1656.12	4839.41
	28 DAA	--	105.188	1599.662	-1.107	238.58*	0.979	1463.18	4543.73
Dry weight (%)	16.529	86.797	977.986	1.185	144.11*	0.986	1448.85	14294.36

Sociedade Brasileira da Ciência das Plantas Daninhas Departamento de Fitotecnia - DFT, Universidade Federal de Viçosa - UFV, 36570-000 - Viçosa-MG - Brasil, Tel./Fax::(+55 31) 3899-2611 - Viçosa - MG - Brazil
E-mail: rpdaninha@gmail.com

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[TFN01] 1/ Results expressed in grams of glyphosate (acid equivalent) required for 50% of population control (LD1/ 50) or for 50% of growth reduction (GR50); 2/ DAA - days after application; 3/ average value of susceptible biotypes.