Since the 1980's and the 1990's, the role of the private sector in agrarian consultancy has seen an increase worldwide. An evidence of such evolution can be seen in the Mantaro Valley (Peru), in the context of small agriculture. In order to assess its consequences, we carried out interviews with supplies providers, extension workers, and producers. In this case, private consultancy is carried out alongside the sale of supplies which, even while it stimulates the access to technical support for almost all producers, it does not take into account their overall needs. This research shows the relevance of a better coordination between the public and private actors of the agrarian consultancy system.