PHENOTYPIC REACTION TO COLLETOTRICHUM ACUTATUM IN FOUR OLEA EUROPAEA CULTIVARS
The olive tree disease, named in Portugal as gafa, is caused by fungi of Colletotrichum genus. Two species of this genus (C. gloesporioides and C. acutatum) were identified as causal agents of the disease. However, our research has pointed out that C. acutatum is the prevalent pathogen on the southern region of the country. A comparative study among four olive tree cultivars, two from Portugal (Galega and Cobrançosa) and the other two from Spain (Picual and Arbequina) was conducted to evaluate the variability of reaction types to C. acutatum infections. The analysis of phenotypic reactions revealed significant differences between Galega and Picual, with the most susceptibility for Galega versus characteristics of resistance shown by Picual. The cultivar Cobrançosa and the cultivar Arbequina had performances classified as intermediates, which could be connected with differences on the timing of maturation. Several factors involved in the response of the four olive tree cultivars face to the attack of C. acutatum are discussed in this work, as a contribution to the knowledge of the resistance to gafa and, consequently, to the disease management.
Carvalho, M.T., Gonçalves, M.J., Monteiro da Silva, M.J., Gomes, S., Martins Lopes, P. and Guedes-Pinto, H. (2012). PHENOTYPIC REACTION TO COLLETOTRICHUM ACUTATUM IN FOUR OLEA EUROPAEA CULTIVARS. Acta Hortic. 949, 329-332
olive tree, Colletotrichum acutatum, disease resistance