Critical-point model to estimate yield loss caused by Asian soybean rust

Danelli, Anderson Luiz Durante; Reis, Erlei Melo; Boaretto, Cristina

doi:10.1590/0100-5405/2003

Anderson Luiz Durante Danelli Autor para correspondência: Anderson Luiz Durante Danelli (andersondanelli@hotmail.com)

Laboratório de Fitopatologia - Micologia, Faculdade de Agronomia e Medicina Veterinária, Curso de Pós-graduação em Agronomia, Universidade de Passo Fundo, 99001-970, Passo Fundo, RS, Brasil.

Erlei Melo Reis

Laboratório de Fitopatologia - Micologia, Faculdade de Agronomia e Medicina Veterinária, Curso de Pós-graduação em Agronomia, Universidade de Passo Fundo, 99001-970, Passo Fundo, RS, Brasil.

Cristina Boaretto

Laboratório de Fitopatologia - Micologia, Faculdade de Agronomia e Medicina Veterinária, Curso de Pós-graduação em Agronomia, Universidade de Passo Fundo, 99001-970, Passo Fundo, RS, Brasil.

Autor para correspondência: Anderson Luiz Durante Danelli (andersondanelli@hotmail.com)

1
Dissertação de mestrado (2012), Bolsista Capes/Prosup/UPF.

2
Bolsista do CNPq.

Figures (3)
Tables (4)

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Figure 1
Relationship between leaflet incidence (%) and grain yield (soybean pathosystem x Asian soybean rust) for BRS GO 7560 and BRS246 RR in the phenological stage R5.3, R5.4 and R5.5.

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Figure 2
Relationship between lesions (nº/cm²) and grain yield (soybean pathosystem x Asian soybean rust) for BRS GO 7560 and BRS 246 RR, in the phenological stage R5.4 and R5.5.

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Figure 3
Relationship between uredinium (nº./cm²) and grain yield (soybean pathosystem x Asian soybean rust) for BRS GO 7560 and BRS 246 RR, in the phenological stage R5.4 and R5.5.

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Table 1
Interval between fungicide sprays and number of applications to generate the gradient intensity of Asian soybean rust. Passo Fundo, Rio Grande do Sul State, Brazil

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Table 2
Linear regression equations relating soybean grain yield (Y), normalized to 1,000 kg/ha to the leaflet incidence (LI) of Asian rust, in the phenological stage R5.3, R5.4 and R5.5, showing the significance level (p) and the coefficient of determination (R²) for cultivars BRS GO 7560 and BRS 246 RR. Passo Fundo, Rio Grande do Sul State, Brazil

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Table 3
Linear regression equations relating soybean grain yield (Y), normalized to 1,000 kg/ha to leaflet lesions (L) density (no./cm²) of Asian rust, in the phenological stage R5.4 and R5.5, showing the significance level (p) and the coefficient of determination (R²) for the cultivars BRS GO 7560 and BRS 246 RR. Passo Fundo, Rio Grande do Sul State, Brazil

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Table 4
Linear regression equations relating soybean grain yield (Y), normalized to 1,000 kg/ha to the leaflet uredinium (U) density (no./cm²) of Asian rust, in the phenological stage R5.4 and R5.5, showing the significance level (p) and the coefficient of determination (R²) for the cultivars BRS GO 7560 and BRS 246 RR. Passo Fundo, Rio Grande do Sul State, Brazil

Intervals (Days)	Spray (no.)
Control	Nill
10	3
15	3
20	2
25	2

Cultivar/Season	Sowing time^* * For the growing season 2009/2010, the first sowing time (I) was 11/26/2009 and the second sowing time (II) was 12/16/2009, for the growing season 2010/2011, the first sowing time (I) was 11/12/2010 and the second sowing time (II) was 01/01/2010.	Phenological stages	Equation [Y= 1,000 - a (I)]	p	R²
BRS GO 7560 2009/10	I	R5.3	Y= 1,000 - 7.02 LI	0.001	0.64
		R5.4	Y= 1,000 - 6.45 LI	<0.0001	0.84
		R5.5	Y= 1,000 - 5.72 LI	0.001	0.65
	II	R5.3	Y= 1,000 - 6.97 LI	0.01	0.32
		R5.4	Y= 1,000 - 6.39 LI	0.01	0.81
		R5.5	Y= 1,000 - 5.49 LI	0.01	0.36
BRS GO 7560 2010/11	I	R5.3	Y= 1,000 - 6.77 LI	0.001	0.81
		R5.4	Y= 1,000 - 5.52 LI	0.001	0.84
		R5.5	Y= 1,000 - 5.07 LI	0.001	0.81
	II	R5.3	Y= 1,000 - 3.41 LI	0.01	0.11
		R5.4	Y= 1,000 - 3.99 LI	0.001	0.56
		R5.5	Y= 1,000 - 4.53 LI	0.01	0.91
BRS 246 RR 2009/10	I	R5.3	Y= 1,000 - 6.95 LI	0.0001	0.99
		R5.4	Y= 1,000 - 5.31 LI	0.01	0.68
		R5.5	Y= 1,000 - 6.78 LI	0.01	0.75
	II	R5.3	Y= 1,000 - 9.02 LI	0.01	0.44
		R5.4	Y= 1,000 - 5.62 LI	0.01	0.67
		R5.5	Y= 1,000 - 5.24 LI	0.01	0.53
BRS 246 RR 2010/11	I	R5.3	Y= 1,000 - 6.63 LI	0.01	0.19
		R5.4	Y= 1,000 - 6.81 LI	0.01	0.79
		R5.5	Y= 1,000 - 6.57 LI	0.01	0.81
	II	R5.3	Y= 1,000 - 5.93 LI	0.001	0.88
		R5.4	Y= 1,000 - 4.47 LI	0.01	0.90
		R5.5	Y= 1,000 - 3.63 LI	0.01	0.60

Cultivar/	Sowing time^* * For the growing season 2009/2010, the first sowing time (I) was 11/26/2009 and the second sowing time (II) was 12/16/2009; for the growing season 2010/2011, the first sowing time (I) was 11/12/2010 and the second sowing time (II) was 01/01/2010.	Phenological stages	Equation	p	R²
Season			[Y= 1,000 - a (L)]
BRS GO 7560 2009/10	I	R5.4	Y= 1,000 - 127.4 L	0.001	0.84
	I	R5.5	Y= 1,000 - 85.61 L	0.001	0.57
	II	R5.4	Y= 1,000 - 119.20 L	0.001	0.31
	II	R5.5	Y= 1,000 - 95.72 L	0.001	0.73
BRS GO 7560 2010/11	I	R5.4	Y= 1,000 - 87.11 L	0.01	0.83
	I	R5.5	Y= 1,000 - 85.61 L	0.01	0.84
	II	R5.4	Y= 1,000 - 26.87 L	0.001	0.98
	II	R5.5	Y = 1,000 - 17.51 L	0.001	0.97
BRS 246 RR 2009/10	I	R5.4	Y= 1,000 - 64.26 L	0.001	0.89
	I	R5.5	Y= 1,000 - 62.29 L	0.01	0.87
	II	R5.4	Y = 1,000 - 68.78 L	0.0001	0.88
	II	R5.5	Y = 1,000 - 68.34 L	0.0001	0.84
BRS 246 RR 2010/11	I	R5.4	Y= 1,000 - 103.7 L	0.001	0.93
	I	R5.5	Y= 1,000 - 25.93L	0.01	0.79
	II	R5.4	Y= 1,000 - 77.47 L	0.001	0.96
	II	R5.5	Y= 1,000 - 13.34 L	0.001	0.99

Cultivar/ Season	Sowing time^* * For the growing season 2009/2010, the first sowing time (I) was 11/26/2009 and the second sowing time (II) was 12/16/2009; for the growing season 2010/2011, the first sowing time (I) was 11/12/2010 and the second sowing time (II) was 01/01/2010.	Phenologicalstages	Equations Y= 1,000 - a(U)	p	R²
BRS GO 7560 2009/10	I	R5.4	Y= 1,000 - 74.92 U	0.0001	0.86
	I	R5.5	Y= 1,000 - 45.28 U	0.0001	0.55
	II	R5.4	Y= 1,000 - 110.28 U	0.01	0.86
	II	R5.5	Y= 1,000 - 39.52 U	0.01	0.89
BRS GO 7560 2010/11	I	R5.4	Y= 1,000 - 58.04 U	0.01	0.89
	I	R5.5	Y= 1,000 - 30.48 U	0.01	0.97
	II	R5.4	Y= 1,000 - 6.79 U	0.001	0.97
	II	R5.5	Y= 1,000 - 5.53 U	0.01	0.96
BRS 246 RR 2009/10	I	R5.4	Y= 1,000 - 35.61 U	0.01	0.84
	I	R5.5	Y= 1,000 - 26.11 U	0.01	0.82
	II	R5.4	Y= 1,000 - 34.45 U	0.0001	0.89
	II	R5.5	Y= 1,000 - 34.42 U	0.001	0.92
BRS 246 RR 2010/11	I	R5.4	Y= 1,000 - 51.38 U	0.001	0.95
	I	R5.5	Y= 1,000 - 12.49 U	0.01	0.89
	II	R5.4	Y= 1,000 - 9.03 U	0.01	0.89
	II	R5.5	Y= 1,000 - 34.42 U	<0.0001	0.99

[1] Autor para correspondência: Anderson Luiz Durante Danelli (andersondanelli@hotmail.com)

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Critical-point model to estimate yield loss caused by Asian soybean rust

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ABSTRACT