INCIDENCE AND SEVERITY OF WILT IN ARTIFICIALLY INOCULATED CV. CORNICABRA YOUNG OLIVE TREES WITH DEFOLIANTING AND NON-DEFOLIANTING VERTICILLIUM DAHLIAE PATHOTYPES

Verticillium wilt is a relatively recent disease of olive trees, which affects severely young orchards in particular.
The study of the infection processes of Verticillium dahliae is important for setting up control methods so as to avoid, or reduce, the problems that develop in newly established groves.
To this aim, young olive trees of cv.
Cornicabra that had been mist propagated from leafy stem cuttings were artificially inoculated with defoliating and non-defoliating V. dahliae pathotypes.
Seventeen weeks after inoculation the incidence of the disease was 100%. Remarkable was the influence of wounds in disease establishment, as a severity of 4.18 (5 being the highest value of the scale) was scored in wounded plants inoculated with defoliating pathotype, and a severity of 3.99 with non-defoliating pathotypes, in comparison with the severity reached in non-wounded young rootling (2.91 and 2.92 for each pathotype, respectively) and in control plants (1.00). Inoculations made in the collar of the plants were more severe (4.26) than those in the stem (3.64), root system (3.10) , and leaves (2.99).

IV International Symposium on Olive Growing

M.L. Soriano, A. Porras, C. Cañizares, M.M. González, A. Linares

Olea europaea, artificial infection, Verticillium dahliae pathotypes, verticillum wilt

https://doi.org/10.17660/ActaHortic.2002.586.171