Chemical products for corn bacterial streak control

Pietrobon, Alex Junior; Duarte Júnior, José Barbosa; Kuhn, Odair José

doi:10.1590/1983-40632021v5168121

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Pesquisa Agropecuária Tropical

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Research Article • Pesqui. Agropecu. Trop. 51 • 2021 • https://doi.org/10.1590/1983-40632021v5168121 copy

Chemical products for corn bacterial streak control

Produtos químicos no controle de estria bacteriana do milho

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Xanthomonas vasicola pv. vasculorum is one of the main bacterial diseases in corn, which causes damage to crops due to its fast dissemination and difficult control. This study aimed to evaluate the effects of chemical products on its control and corn grain yield. The experimental design was randomized blocks, in a 2 x 7 factorial arrangement, with three replications. The first factor consisted of the corn hybrids P30F53VYHR (more resistant to the disease) and P4285VYHR (more susceptible) and the second one of six active ingredients (kasugamycin, sulfur, cuprous oxide, copper oxychloride, quaternary ammonia and potassium phosphite) and one control (no application). The obtained data were used to estimate the area under the disease progress curve. The products based on quaternary ammonia, cuprous oxide, copper oxychloride and kasugamycin provided a greater disease control. P30F53VYHR presented a higher grain yield than that for P4285VYHR. Therefore, the use of a genetically resistant hybrid is an efficient alternative for the management of this bacteriosis.

KEYWORDS:
Xanthomonas vasicola pv; vasculorum; Zea mays; genetic control

pH (CaCl₂)	Ca	Mg	K	P	Al	H + Al	T	V (%)	OM (g dm^-3)
5.6	10.07	3.01	0.94	38.5	0	3.41	14.02	80.3	33.1
Sand	Silt	Clay	Fe	Mn	Cu	Zn	Ca/Mg	Ca/K	Mg/K
17.5	17.38	65	22.9	32.3	2.05	4.85	3.36	10.74	3.21

Active ingredient	Concentration (g a.i. L^-1 or kg)	Dose (mL ha^-1)
Kasugamycin	20	3,000
Sulfur + nitrogen	250 + 110	1,500
Cuprous oxide	500	100
Copper oxychloride + nitrogen	499 + 68	500
Calcium + nitrogen + (quaternary ammonia + salicylic acid)	20 + 10	1,500
Potassium phosphite + magnesium + sulfur + copper + nickel	450 + 250 + 23 + 29 + 10 + 5	500
Control (no application)	0	0

Active principle	P30F53VYHR	CE (%)	P4285VYHR	CE (%)
Kasugamycin	0^ns ns non-significant at 0.05. A¹ 1 Means followed by the same lowercase letter in the rows and uppercase letter in the lines do not differ by the Tukey test (p ≤ 0.05). Original AUDPC data. For analysis purposes, the AUDPC points data were transformed into √ + 5; CE (%): means for control efficacy.	0	49.61 abB	47.56
Sulfur	0 A	0	72.68 cdB	23.17
Cuprous oxide	0 A	0	38.26 aB	59.56
Copper oxychloride	0 A	0	43.34 aB	54.19
Quaternary ammonia	0 A	0	36.95 aB	60.94
Potassium phosphite	0 A	0	65.45 bcB	30.81
Control	0 A	0	94.60 dB	0
Mean	0		57.27
CV (%)	0		19.55

Active principle	Severity (%)^* * Original data. For severity analysis purposes, the AUDPC points data were transformed into √ + 5.
Active principle	P30F53VYHR	P4285VYHR
Kasugamycin	0^ns ns non-significant at 0.05. A¹ 1 Means followed by the same lowercase letter in the rows and uppercase letter in the lines do not differ by the Tukey test (p ≤ 0.05).	6.03 bcdB
Sulfur	0 A	7.04 cdB
Cuprous oxide	0 A	4.81 abB
Copper oxychloride	0 A	5.21 abcB
Quaternary ammonia	0 A	4.25 aB
Potassium phosphite	0 A	6.69 cdB
Control	0 A	7.48 dB
General mean	0	5.93
CV (%)	0	16.53

Active principle	Yield¹ 1 and
Active principle	P30F53VYHR	P4285VYHR
Kasugamycin	13,279.0^ns ns no difference for variation (products) and, for means with the same capital letter in the rows (hybrids), they do not differ by the Tukey test (p ≤ 0.05). Data presented in kg ha-1. A¹ 1 and	10,983.0^ns ns no difference for variation (products) and, for means with the same capital letter in the rows (hybrids), they do not differ by the Tukey test (p ≤ 0.05). Data presented in kg ha-1. B
Sulfur	13,175.0 A	10,679.0 B
Cuprous oxide	13,295.0 A	10,816.0 B
Copper oxychloride	13,337.0 A	10,650.0 B
Quaternary ammonia	13,162.0 A	10,729.0 B
Potassium phosphite	13,133.0 A	10,929.0 B
Control	13,300.0 A	10,483.0 B
General mean	13,240.0	10,752.0
CV (%)	0.91	1.99

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[TFN1] ¹
Micronutrient and P contents are expressed in mg dm^-3; other nutrients in cmol dm^-3.