Standard area diagram set for olive leaf spot assessment/Escala diagramatica para avaliacao de repilo em oliveira

• Published in: Ciência rural Vol. 47; no. 6
• Main Authors: Sachet, Marcos Robson, Danner, Moeses Andrigo, Citadin, Idemir, Pe, Guerrezi, Marieli Teresinha
• Format: Journal Article
• Language: Spanish
• Published: Universidade Federal de Santa Maria 01-06-2017
• Subjects: Estados Unidos
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20160923

The establishment of olive (Olea europaea) orchards in Brazil is increasing due to their economic potential and benefits to human health. However, a number of limiting factors need to be overcome, such as Olive Leaf Spot (OLS) occurrence, for olives to reach their full potential. OLS, which is caused by Fusicladium oleaginum, results in defoliation and a reduction in fruit production. This study aimed to develop a standard area diagram set (SAD) for the assessment of OLS severity under humid subtropical climate conditions. The SAD was developed with six levels of severity (1, 3, 6, 9, 12 and 15%) and OLS severity was validated by eight inexperienced raters. Using the SAD provided an increase in accuracy, precision and concordance, while also reducing the smallest difference detectable. The proposed SAD was adequate at estimating the OLS and could be a useful tool for use in epidemiological andphytopathometry studies, evaluation of control strategies and selection of resistant genotypes. Key words: Olea europaea, olive peacock's eye, phytopatometry. O cultivo da oliveira (Olea europaea) no Brasil e crescente devido seu potencial economico e pelos beneficios que seus produtos oferecem a saude humana, entretanto, alguns fatores limitantes precisam ser superados, como a ocorrencia do repilo (OLS). O repilo, causado pelo fungo Fusicladium oleagineum, causa desfolha e reducao da producao de azeitonas. O objetivo deste trabalho foi elaborar uma escala diagramatica para auxiliar nas estimativas de severidade de repilo em oliveira em condicao de clima subtropical umido. A escala diagramatica foi elaborada com 6 niveis (1, 3, 6, 9, 12 e 15%) e validada por 8 avaliadores inexperientes. Com o uso da escala houve aumento na acuracia, precisao e concordancia, tambem reducao do menor valor de severidade detectavel. A escala proposta foi adequada para estimar a severidade de repilo em oliveira, podendo ser utilizada para estudos epidemiologicos, avaliacao de estrategias de controle e selecao de genotipos resistentes. Palavras-chave: Olea europaea, olho-de-pavao, fitopatometria.