Carryover of ACCase inhibitors for corn

Mattiuzzi, Mateus Dalpubel; Nalin, Daniel; Ferreira, Luiz Augusto Inojosa; Placido, Henrique Fabrício; Biffe, Denis Fernando; Oliveira Junior, Rubem Silvério De

doi:10.1590/0034-737X202370050019

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Plant health • Rev. Ceres 70 (5) • 2023 • https://doi.org/10.1590/0034-737X202370050019 copy

Carryover of ACCase inhibitors for corn¹ 1 The work was extracted from a dissertation of the graduate student Mateus Dalpubel Mattiuzzi and the funding source was CAPES.

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Sequential crops may be affected by herbicide residuals in the soil. In corn crop there are reports of problems when the crop is sown soon after application of ACCase-inhibiting herbicides. The aim of this study was to evaluate safety intervals for the application of ACCase-inhibiting herbicides before sowing corn in different soils. Two experiments were conducted in a greenhouse, and in the field conditions. In both, the experimental design were completely randomized in factorial scheme 6x4+1 (6 periods of application x 4 herbicides + 1 control) with five replications. The treatments were: haloxyfop-P-methyl (124.7 g ha^-1), clethodim – formulation 1 (192 g ha^-1), quizalofop-P-ethyl (100 g ha^-1) and clethodim formulation 2 (192 g ha^-1) in applications at 15, 10, 5, 3, 1 and 0 days before sowing in sandy and clayey soil. In the greenhouse, formulations based on clethodim were more safety in both types of soils, and safety intervals for clethodim-based herbicides were 5 days and greater than 15 days for quizalofop-P-ethyl and haloxyfop. Haloxyfop should not be applied on day of sowing in clay soil. In the field none of the treatments compromised the development and yield of the crop, even when applied on the day of sowing.

Keywords
clethodim; haloxyfop-P-methyl; quizalofop-p-ethyl; Zea mays

Herbicides	15 DBS	7 DBS	2 DBS	0 DBS
Herbicides	Phytointoxication (%) 7 DAE
Clethodim (formulation 1)	0.0 aA	4.2 aB	11.0 bC (+)	13.0 bC (+)
Haloxyfop-P-methyl	2.2 aA	6.0 aB (+)	6.0 aB (+)	8.0 aB (+)
Quizalofop-P-ethyl	2.0 aA	6.0 aB (+)	6.0 aB (+)	6.0 aB (+)
Clethodim (formulation 2)	1.2 aA	5.6 aB (+)	10.0 bC (+)	8.0 aBC (+)
Control	0.00%
CV%	20.4	DMS Dunnet	4.3 DMS t	2.9
Herbicides	Plant height (%) 21 DAE^ns ns Means do not differ from the control without application by the Dunnett test (p ≤ 0.05).
Clethodim (formulation 1)	98.6	97.6	99.4	98.6
Haloxyfop-P-methyl	99.2	97.4	99.4	99.0
Quizalofop-P-ethyl	97.4	98.6	100	98.4
Clethodim (formulation 2)	98.4	98.0	99.0	99.8
Control	100
CV%	1.5	DMS Dunnet	2.8 DMS t	5.2
Herbicides	Stand (%) 21 DAE^ns ns Means do not differ from the control without application by the Dunnett test (p ≤ 0.05).
Clethodim (formulation 1)	98.2	100	97.2	98.2
Haloxyifop-P-methyl	96.4	96.6	98.0	98.2
Quizalofop-P-ethyl	98.0	100	98.0	100
Clethodim (formulation 2)	97.0	100	98.4	97.0
Control	100
CV%	3.98	DMS Dunnet	3.7 DMS t	6.3
Herbicides	Yield (%)
Clethodim (formulation 1)	95.8 aA	96.4 aA	92.0 aA	98.0 aA
Haloxyfop-P-methyl	93.6 aAB	98.0 aA	99.6 aA	89.8 bB
Quizalofop-P-ethyl	93.0 aA	94.2 aA	95.6 aA	97.2 aA
Clethodim (formulation 2)	98.2 aA	96.0 aA	94.8 aA	96.0 abA
Control	100
CV%	5.9	DMS Dunnet	10.5 DMS t	7.1

Herbicides	15 DBS	7 DBS	2 DBS	0 DBS
Herbicides	Phytointoxication (%) 7 DAE
Clethodim (formulation 1)	0.0 aA	5.0 aA	13.0 aB (+)	14.0 abB(+)
Haloxyfop-P-methyl	4.2 aBA	8.0 aA	15.0 aB (+)	14.0 abB (+)
Quizalofop-P-ethyl	7.6 bA	8.0 aA	10.4 aA (+)	8.0 aA
Clethodim (formulation 2)	4.0 abA	8.0 aAB	14.0 aBC (+)	16.0 bC (+)
Control	0
CV%	35.7	DMS Dunnet	8.9 DMS t	6.0
Herbicides	Plant height (%) 21 DAE^ns ns Means do not differ from the control without application by the Dunnett test (p ≤ 0.05).Means followed by (+) are higher than the control by the Dunnett test (p ≤ 0.05).Means followed by equal lower-case letters in the column and equal upper-case letters in the row do not differ by the t test (p ≤ 0.05).
Clethodim (formulation 1)	100	95.8	95.4	95.0
Haloxyfop-P-methyl	100	100	96.2	95.0
Quizalofop-P-ethyl	96.4	98.2	96.6	96.4
Clethodim (formulation 2)	99.4	98.4	98.2	96.4
Control	100
CV%	5.1	DMS Dunnet	9.2 DMS t	8.3
Herbicides	Stand (%) 21 DAE^ns ns Means do not differ from the control without application by the Dunnett test (p ≤ 0.05).Means followed by (+) are higher than the control by the Dunnett test (p ≤ 0.05).Means followed by equal lower-case letters in the column and equal upper-case letters in the row do not differ by the t test (p ≤ 0.05).
Clethodim (formulation 1)	98	97.4	94.6	96
Haloxyfop-P-methyl	98.4	94.4	98.2	100
Quizalofop-P-ethyl	97.2	96.2	95.6	98
Clethodim (formulation 2)	98.4	98.8	99.4	95.4
Control	100
CV%	5.1	DMS Dunnet	9.2 DMS t	8.3
Herbicides	Yield (%)
Clethodim (formulation 1)	95.8 aA	96.0 aA	94.8 abA	98.4 aA
Haloxyfop-P-methyl	99.4 aA	95.8 aAB	92.8 bB	95.0 aAB
Quizalofop-P-ethyl	95.2 aA	98.0 aA	96.4 abA	95.4 aA
Clethodim (formulation 2)	98.2 aA	96.4 aA	99.2 aA	95.8 aA
Control	100
CV%	4.5	DMS Dunnet	8.1 DMS t	4.5

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[1] *Corresponding author: danielnalin97@gmail.com

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Carryover of ACCase inhibitors for corn1 1 The work was extracted from a dissertation of the graduate student Mateus Dalpubel Mattiuzzi and the funding source was CAPES.

ABSTRACT

Carryover of ACCase inhibitors for corn¹ 1 The work was extracted from a dissertation of the graduate student Mateus Dalpubel Mattiuzzi and the funding source was CAPES.