ISHS Acta Horticulturae 433: I International Symposium on Edible Alliaceae
DEVELOPMENT OF SHORT-DAY YELLOW ONION FOR TROPICAL ENVIRONMENT OF THE BRAZILIAN NORTHEAST |
| Authors: | J.G.E. de Franca, J.A. Candeia |
| Keywords: | Yellow onion, C. gloeosporioides, T. tabaci, high temperature, tropics |
| Abstract:
The Brazilian Northeast is one the main producing onion areas in the nation, particularly at River São Francisco valley, between the states of Pernambuco and Bahia. Annually, an estimated area of 10.000 ha has been cultivated, especially from February to July. The most popular cultivars are 'TG 502', 'Composto IPA-6', 'Pera IPA-4' (yellow), and 'Red Creole', 'Roxa IPA-3' and 'Mutuali IPA-8' (red). The cropping area is located at 8 °S, on soils predominantly Alluvials, Latossols and Vertisols. The fungi Colletotrichum gloeosporioides, Pyrenochaeta terrestris, Alternaria porri, Fusarium spp., and the pest Thrips tabaci are the most significant biological constraints. The breeding program carried out at IPA - Empresa Pernambucana de Pesquisa Agropecuária, based at state of Pernambuco, has its main goals, the development of short day yellow cultivars tolerant to C. gloeosporioides and T. tabaci, associated to good post-harvesting conservation. Among the released cultivars, 'Composto IPA-6' has shown good adaptation during the whole year, high yield capacity, and is being used in 30% of the cropping area. Recently, 'Belem IPA-9' was released, having as main characteristics, good yield performance, adaptation throughout the year, and a remarkable tolerance to C. gloeosporioides. | |
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