Coffee rust is the most important disease of the crop, the severity of leaf damage caused by the pathogen causes leaf abscission and significantly affects the reduction of yields. This investigation was carried out with the objective of comparing the visual method with a digital one, in the quantification of the percentage of severity of the rust in different sizes of leaves. The quantifications of the disease were carried out at the University Clinic for Agricultural Diagnostics at Oriente University. To carry out the experiment, 360 leaves injured with rust were collected from Catuaí Rojo plantations and divided into three groups, categorized according to leaf area into large, medium and small, each group was represented by 120 leaves, initially evaluated by the visual method by two observers with the help of the diagrammatic scale and later with the digital method by analyzing images with the ImageJ® program. The randomized block design was used with a 2x3 factorial arrangement with ten repetitions per experimental unit. The data were processed by analysis of variance. It was found that the severity percentage did not present statistical differences for the digital methodology when the size of the sheets was changed; while, for the visual methodology, therewas an influence of the size of the leaves, observing that the estimated severity increased as the size of the leaves decreased. The digital method is a reliable alternative for the quantification of the severity of attack by coffee rust.
Con el objetivo de cuantificar las variables germinación inicial (GIN), germinación final (GFI), índice de velocidad de germinación (IVG) y longitud de la radícula (LRA) de moringa, variedades “Supergenius” y “Criolla”, con inmersión en agua por 12 horas, o sin inmersión, colocadas en sustratos de papel absorbente y/o arena lavada de río, se instaló un ensayo donde los tratamientos proceden del arreglo factorial 23, en el diseño de bloques al azar, con cuatro repeticiones. Una bandeja con 50 semillas por unidad experimental y 16 bandejas de aluminio por sustrato. Las cuantificaciones se realizaron entre los 5 y 8 días después del soterro y sus valores interpretados por desglosamiento y prueba de Tukey a 5% de probabilidad. La GIN en el sustrato papel fue superior para “Supergenius”, aunque en arena, ambas variedades fueron idénticas. No hubo diferencias entre sustratos en presencia o ausencia de la inmersión, aunque, la GIN en arena fue superior, para las semillas tratadas con inmersión. La GFI; fue superior en “Supergenius”, y de manera similar para el IVG, “Supergenius” difiere de la “Criolla”, con mayor índice; adicionalmente, cuando son sometidas a un proceso de inmersión, “Supergenius” presenta mayor índice de velocidad de germinación, y el proceso de inmersión acelera ese valor. Las semillas sometidas a inmersión, para la variable LRA, presentaron mayor longitud y fue el sustrato papel donde se observaron esos mayores valores. Para evaluar germinación en semillas de moringa, es pertinente colocarlas en inmersión durante 12 horas y usar papel como sustrato de soporte.
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