| Revista: | Anais da Academia Brasileira de Ciencias |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000436139 |
| ISSN: | 0001-3765 |
| Autores: | Poletto, Tales1 Muniz, Marlove Fátima B2 Lucio, Alessandro Dal’Col2 Fantinel, Vinícius S1 Heldwein, Arno Bernardo2 Reiniger, Lia Rejane S2 Blume, Elena1 |
| Instituciones: | 1Universidade Federal de Santa Maria, Departamento de Defesa Fitossanitaria, Santa Maria, Rio Grande do Sul. Brasil 2Universidade Federal de Santa Maria, Departamento Fitotecnia, Santa Maria, Rio Grande do Sul. Brasil |
| Año: | 2020 |
| Volumen: | 92 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico, descriptivo |
| Resumen en inglés | Brown leaf spot disease, caused by the fungus Ragnhildiana diffusa, is responsible for losses in pecan orchards and quantification is essential in order to conduct epidemiological studies to establish levels of productivity losses, and assess control strategies. Therefore, the aim of this study was to develop and validate a diagrammatic scale for assessing the severity of brown leaf spot in pecan. 240 symptomatic leaflets were collected from adult trees in Anta Gorda, in the Brazilian state of Rio Grande do Sul, and used to assess the current percentage severity of the disease. The scale was based on the minimum and maximum observed severity of the disease, with six graduations defined according to the Weber-Fechner Visual Stimulus Law. The scale therefore consisted of eight levels (1.5, 4.6, 10.6, 17.3, 39.5, 65.1, 77.5, and 98%). The estimates of eight evaluators provided a basis for validating the scale. They made estimates of disease severity on 40 symptomatic digitalized pecan leaflets first, without using the scale and then referring to it. The scale provided greater precision, accuracy, and reproducibility of estimates and should result in more reliable epidemiological studies |
| Disciplinas: | Agrociencias |
| Palabras clave: | Fitopatología, Frutales, Hongos, Nogal pecanero, Mancha parda de las hojas, Daño foliar, Hongos fitopatógenos, Ragnhildiana diffusa, Ascomycetes, Carya illinoinensis, Juglandaceae |
| Keyword: | Phytopathology, Fruit trees, Fungi, Pecan tree, Brown leaf spot, Leaf damage, Phytopathogenic fungi, Ragnhildiana diffusa, Ascomycetes, Carya illinoinensis, Juglandaceae |
| Texto completo: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
