Standard area diagram set for scab quantification in trilobed leaves of the sour passion fruit

Costa, Anne Pinheiro; Peixoto, José Ricardo; Blum, Luiz Eduardo Bassay; Oliveira, Alexandre Bosco de

doi:10.1590/0103-8478cr20190309

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CROP PROTECTION • Cienc. Rural 50 (3) • 2020 • https://doi.org/10.1590/0103-8478cr20190309 copy

Standard area diagram set for scab quantification in trilobed leaves of the sour passion fruit

Escala diagramática para a quantificação da verrugose em folhas trilobadas do maracujazeiro azedo

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The study aimed to develop and validate a standard area diagram set (SADs) to improve accuracy, precision, and reproducibility in the assessment of scab severity in trilobed leaves of the sour passion fruit. The SADs comprised six severity levels (1%; 3%; 6%; 11%; 21%; and 33%). The SADs increased the accuracy of the estimates by reducing the constant and systematic errors, and the tendency to overestimate the actual severity, limited the number of evaluators who presented this trend, in addition to increasing the bias correction factor. The inexperienced evaluators were the ones that benefited the most from the SADs use. Once the SADs was introduced, 80% and 100% evaluators gave estimates free from constant and systematic errors, respectively. The improvement in precision was verified by the increase in the coefficient of determination and Lin’s concordance correlation coefficient, by reducing absolute errors and increasing the reproducibility of the estimates.

Key words:
Passiflora edulis Sims; Cladosporium spp.; phytopathometry.

Authorship

Anne Pinheiro Costa ^*E-mail: annecosta@gmail.com. *Corresponding author

Universidade de Brasília (UNB), Faculdade de Agronomia e Medicina Veterinária, 70910-900, Brasília, DF, Brasil.. Universidade de Brasília (UNB)BrazilBrasília, DF, BrazilUniversidade de Brasília (UNB), Faculdade de Agronomia e Medicina Veterinária, 70910-900, Brasília, DF, Brasil..

https://orcid.org/0000-0002-8818-6123

José Ricardo Peixoto

Luiz Eduardo Bassay Blum

Universidade de Brasília (UNB), Instituto de Ciências Biológicas, Departamento de Fitopatologia, Brasília, DF, Brasil.Universidade de Brasília (UNB)BrazilBrasília, DF, BrazilUniversidade de Brasília (UNB), Instituto de Ciências Biológicas, Departamento de Fitopatologia, Brasília, DF, Brasil.

Alexandre Bosco de Oliveira

Universidade Federal do Ceará (UFC), Departmento de Fitotecnia, Fortaleza, CE, Brasil.Universidade Federal do Ceará (UFC)BrazilFortaleza, CE, BrazilUniversidade Federal do Ceará (UFC), Departmento de Fitotecnia, Fortaleza, CE, Brasil.

E-mail: annecosta@gmail.com. ^*Corresponding author

DECLARATION OF CONFLICT OF INTEREST

The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.

AUTHORS’ CONTRIBUTION

The authors also contributed to the design and writing of the article.

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables

Figures (1)
Tables (2)

Thumbnail

Figure 1
Standard area diagram set to assess scab severity (%) (Cladosporium spp.) in trilobed leaves of the sour passion fruit (Passiflora edulis Sims).

Thumbnail

Table 1
Intercept (a), slope (b) and coefficient of determination (R ² ) of linear regression equations calculated between actual and estimated scab (Cladosporium spp.) severity in trilobed leaves of the sour passion fruit (Passiflora edulis Sims), in evaluations performed without and with the aid of the standard area diagram set (SADs).

Thumbnail

Table 2
Correlation between estimated and actual severities(r), bias correction factor (C _b ), and Lin’s concordance correlation coefficient (ρ _c ) of scab (Cladosporium spp.) in trilobed leaves of the sour passion fruit (Passiflora edulis Sims), evaluated without and with the aid of the standard area diagram set (SADs).

Figure 1 Standard area diagram set to assess scab severity (%) (Cladosporium spp.) in trilobed leaves of the sour passion fruit (Passiflora edulis Sims).

Table 1 Intercept (a), slope (b) and coefficient of determination (R ² ) of linear regression equations calculated between actual and estimated scab (Cladosporium spp.) severity in trilobed leaves of the sour passion fruit (Passiflora edulis Sims), in evaluations performed without and with the aid of the standard area diagram set (SADs).

	Evaluators	------------------------Evaluation 1------------------------			-------------------------Evaluation 2-----------------------
G1	Inexperienced	-----------------------Without SADs----------------------			------------------------Without SADs-----------------------
		a	b	R ²	a	b	R ²
	1	18.01^*	2.20^*	0.65	7.30^*	2.09^*	0.76
	2	7.17^*	1.44^*	0.79	6.80^*	1.63^*	0.91
	3	2.94^*	1.01	0.80	6.29^*	0.69^*	0.50
	4	6.88^*	3.00^*	0.69	11.01^*	3.19^*	0.72
	5	0.79	1.72^*	0.65	-2.09	1.26	0.58
	Mean	7.16	1.87	0.72	5.86	1.77	0.69
G2	Experienced	-----------------------Without SADs-----------------------			-------------------------Without SADs-----------------------
	6	-2.63	0.91	0.55	-2.12^*	1.06	0.85
	7	5.68	2.15^*	0.58	7.62^*	1.95^*	0.76
	8	8.71^*	1.38^*	0.78	9.01^*	1.38^*	0.75
	9	0.73	1.88^*	0.86	3.26^*	2.12^*	0.85
	10	3.86^*	1.01	0.86	0.49	0.96	0.77
	Mean	3.27	1.47	0.73	3.65	1.49	0.80
G3	Inexperienced	----------------------Without SADs------------------------			---------------------------With SADs-------------------------
	11	-0.95	1.48^*	0.69	0.74	0.99	0.94
	12	4.40^*	1.40^*	0.71	-0.07	0.97	0.88
	13	13.04^*	3.27^*	0.65	1.04	1.03	0.84
	14	5.76^*	1.71^*	0.70	5.99^*	0.99	0.80
	15	1.89	2.15^*	0.84	0.53	0.99	0.94
	Mean	4.83	2.00	0.72	1.65	1.00	0.88
G4	Experienced	-----------------------Without SADs------------------------			--------------------------With SADs-------------------------
	16	5.53^*	1.62^*	0.79	1.11^*	1.02	0.96
	17	5.93^*	2.08^*	0.80	0.34	1.17^*	0.89
	18	1.56	1.03	0.80	0.90^*	0.83^*	0.94
	19	5.72^*	1.11	0.77	0.60	1.08	0.90
	20	3.25	1.89^*	0.72	1.14	1.07	0.79
	Mean	4.40	1.54	0.78	0.82	1.03	0.90

^*Indicates that the Null hypothesis (a = 0 or b = 1) was rejected by the t-test (P≤0.05).

Table 2 Correlation between estimated and actual severities(r), bias correction factor (C _b ), and Lin’s concordance correlation coefficient (ρ _c ) of scab (Cladosporium spp.) in trilobed leaves of the sour passion fruit (Passiflora edulis Sims), evaluated without and with the aid of the standard area diagram set (SADs).

	Evaluators	-------------------Evaluation 1-----------------------			--------------------------Evaluation 2-------------------------
G1	Inexperienced	Without SADs			--------------------------WithoutSADs------------------------
		r	C _b	ρ _c	r	C _b	ρ _c
	1	0.81	0.22	0.18	0.87	0.38	0.33
	2	0.89	0.53	0.47	0.96	0.49	0.46
	3	0.89	0.93	0.83	0.71	0.91	0.64
	4	0.83	0.27	0.22	0.85	0.22	0.18
	5	0.80	0.64	0.51	0.76	0.88	0.67
	Mean	0.84	0.52	0.44	0.83	0.57	0.46
G2	Experienced	-------------------Without SADs--------------------			--------------------------Without SADs-----------------------
	6	0.74	0.90	0.66	0.92	0.97	0.89
	7	0.76	0.39	0.30	0.87	0.39	0.34
	8	0.89	0.49	0.44	0.87	0.49	0.42
	9	0.93	0.60	0.56	0.92	0.46	0.42
	10	0.93	0.88	0.82	0.88	1.00	0.87
	Mean	0.85	0.65	0.56	0.89	0.66	0.59
G3	Inexperienced	-------------------Without SADs--------------------			---------------------------With SADs--------------------------
	11	0.83	0.80	0.67	0.97	1.00	0.96
	12	0.84	0.66	0.56	0.94	1.00	0.94
	13	0.81	0.20	0.16	0.92	0.98	0.90
	14	0.84	0.50	0.42	0.88	0.77	0.68
	15	0.92	0.48	0.44	0.97	1.00	0.97
	Mean	0.85	0.53	0.45	0.94	0.95	0.89
G4	Experienced	-------------------Without SADs--------------------			--------------------------With SADs---------------------------
	16	0.89	0.53	0.48	0.98	0.99	0.96
	17	0.90	0.41	0.36	0.94	0.95	0.89
	18	0.90	0.96	0.86	0.97	0.98	0.95
	19	0.88	0.73	0.64	0.95	0.98	0.93
	20	0.85	0.52	0.44	0.89	0.96	0.85
	Mean	0.88	0.63	0.56	0.95	0.97	0.92

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Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

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Standard area diagram set for scab quantification in trilobed leaves of the sour passion fruit

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[1] E-mail: annecosta@gmail.com. ^*Corresponding author