This paper describes the different bud rot complex diseases in Ecuador and Colombia. Category C0731 showed a good behavior or DA 128 D AF origin in the Plantation Palmeras del Ecuador and an experiment was undertaken to define more accurately the behavior of DA 128 D descendants (duras and commercial) in extension, as well as in replanting programs. The interspecific hybrid E. oleifera x E. guineensis shows a good tolerance to bud rot. Coari (Brazil) origin hybrids were planted at large scale, first in Ecuador and then in Colombia and have shown good oil production rates. At the present time the idea is to improve these hybrids and to assess them with other E. oleifera origins for oil production. A back-crossing program is underway to integrate into E. guineensis the resistance of the American palm, E. oleífera to these diseases. Molecular biology works are being carried out simultaneously so as to look for molecular markers of resistance and sensitivity to these diseases.