Both cultivars have a great potential for introduction into the Brazilian production system, especially in Sao Paulo, because they have fruit features similar to those of the 'Grand Naine' cultivar and because they are tolerant to black Sigatoka
fungus (Mycosphaerella fijiensis Morelet) and Panama disease (Fusarium oxysporum f.
The principal pest problems of banana in Brazil are Sigatoka
leaf spot disease Mycosphaerella musicola R.
With the advent of black Sigatoka
in 2004 in the region caused by fungus Mycosphaerella fijiensis Morelet, severe foliar disease affecting photosynthesis, an intensification of management practices in susceptible varieties, such as the 'Prata Comum' cultivar (Musa sp.
aspx) Fiji Times reported people at the Sigatoka
market were alarmed by the tremor, which lasted 10-15 seconds.
A different variety, Cavendish, that was resistant to the fungus soon replaced Gros Michel, but it, too, is now threatened by a disease called Black Sigatoka
that can only be treated by applying massive doses--as many as 50 applications a year--of fungicides.
In the Ribeira Valley, main producing region of banana of Sao Paulo State, defoliation is a cultural practice adopted for leaves with 50% of its area leaf taken by injuries caused by the Black Sigatoka
, which helps to reduce fungal inoculum source (Mycosphaerella fijiensis) (MORAES et al.
Take for example the Sigatoka
Sand Dunes on the island of Viti Levu.
Louis and are expected to begin validation tests next year; Genes showing positive results for black sigatoka
resistance are currently undergoing larger scale field trials in Central America; Positive initial results in our promotor discovery activity where we were able to validate that our predicted promotors led to the specific gene expression pattern.
One of the main difficulties in the acceptance of 'Maca' banana hybrids has been the maintenance of its characteristic flavor, which is very original among all edible bananas; thus, the Embrapa Cassava and Tropical Fruits developed and introduced in Brazil various genotypes to substitute the 'Maca' banana, selecting 'BRS Princesa' (YB42-07) and the cultivar 'Caipira' ('Yangambi km 05'--AAA), native to Western Africa, both with resistance to the main phytosanitary problems of the crop, such as Panama disease, Yellow Sigatoka
(Mycosphaerella musicola) and Black Sigatoka
Pelo metodo vegetativo, mesmo o material sendo de otima qualidade, o processo e lento e permite a disseminacao de doencas e pragas como mal do Panama, Sigatoka
amarela e broca do rizoma (Souza et al.
Infortunadamente en los ultimos anos, por problemas fitosanitarios graves como la Sigatoka
amarilla y el Moko (Ramirez et al.
CONCENTRATION RATIO AND FREQUENCY OF APPLICATION LEVEL OZONE DAMAGE BLACK SIGATOKA