EPIDEMIOLOGICAL STUDIES OF YELLOW SIGATOKA (MYCOSPHAERELLA MUSICOLA) ON MICROPROPAGATED MUSA CLONES

Studies were conducted to determine the reaction of some banana clones, derived from in vitro plantlets, to yellow Sigatoka caused by Mycosphaerella musicola: Titiaro (‘Pisang mas’ AA), Pineo Gigante and Brasilero (Subgroup Cavendish AAA), and Tetraploid (FAGRO-7.AAAA) were tested.
Experiments began with plants less than 0.5 meters in height, and continued until they reached nearly 1.70 meters, before the blooming state.
Stover’s Scale (1971) modified by Haddad et al. (1991) was used to evaluate the effect of yellow Sigatoka.
Plant height, number of active leaves and average number of youngest leaves spotted (YLS) were also determined.
Severity of the disease were related to climatological information.
Although no significant differences were found, Pineo Gigante appeared as the most affected clone compared to the Brasilero and Titiaro clones, respectively.

These results are significant since in plants obtained by traditional methods, the Titiaro clone has proven to be highly susceptible to the yellow Sigatoka.
Data indicate that the in vitro process could result in variations in plant behavior to the yellow Sigatoka.

II International Symposium on Banana: I International Symposium on Banana in the Subtropics

I. Trujillo, E. García, O. Haddad

Musa sp., incidence, intensity, youngest leaves spotted (YLS)

https://doi.org/10.17660/ActaHortic.1998.490.34