Publications des agents du Cirad

Cirad

Which coconut palm for Lethal Yellowing in Ghana Report on the mission from 11 to 18 June 2006

Dollet M., Bonneau X., Baudouin L.. 2006. Montpellier : CIRAD-CP, 49 p.. numero_rapport: CP_SIC-1995.

The hybrid between the "Malayan Yellow Dwarf" and the "Vanuatu Tall" (MYD x VTT) was widely disseminated in Ghana. However, in the last 2 years, worrying Cape St Paul Wilt (CSPW ) percentages have been found on that hybrid. Although, in June 2006, we do not have enough hindsight regarding the performance of the hybrid between Sri-Lanka Green Dwarf (SGD) and the VTT in relation to CSPW, its performance can be inferred from that of its parents. Both seem to be much less attacked by CSPW than other varieties. However, in Ghana there are large differences in phenotype of the SGD palms according to local agro-ecological conditions. That is why it was felt to be very important to bring together specialists from different horizons, to examine and assess the following at the same time, at the same sites: the performance of the MYDxVTT hybrid, and those of the SGDxVTT. Between 1999 and 2004, 1 300 ha, involving 1 012 farmers in Central and Western Region, were planted with the MYDxVTT, through a grant awarded by CSDP- (funding by Agence Française pour /e Développement). We visited several of these plantations. The results are sometimes very disappointing. For instance, in Central Region at Elmina the disease arrived in August 2004 and so far at least 130 of the 160 MYDxVTT have been killed by CSPW, i.e. 81% mortality. Our observations made at Elmina and Asebu show that there can be some concern for the future of the 1 200 plots replanted with this hybrid. Whatever the case, the spread of CSPW leaves very little hope for farmers once the disease arrives in the plot. The new SGDxVTT seed garden in Bonsaso (2000/2001 - 10 ha), contains 2050 SGD palms. But a large part of it is in a hollow, the low-lying area of which is not drained despite recommendations made in 2002. There has been substantial mortality in this section. Five hundred replacements were made. Unfortunately, they have proved pointless, as most of them are in the bottom of the hollow and were standing in water at

Documents associés

Rapport de mission