To reduce yield losses faced by small farmers in Benin, the agronomic research developed several technologies, of which in particular the integrated Pest Management (IPM), which combines the biological and botanical control with good cultivation practices as well as the use of recommended chemicals. The progress obtained with these various technologies is undeniable (IITA, 96). However, the dramatic effects of the pandemic of the HIV/AIDS undermine the positive impact of research and development project on the wellbeing of the rural households (Bollinger et al, 1999). In Benin, as in other African countries, AIDS became a great threat in the rural zones. More sick people reside in the rural zones, where the epidemic is propagated very rapidly among villagers (Ministry of public health, 2000). This reduces food production and threatens survival of the rural communities. Furthermore, knowledge is reported to be lost, and new agricultural practices appear (FAO, 2000). It is known that knowledge is very important part of livelihood generation strategies (Niehof and Price, 2001). Therefore, the present study aims at proving whether HIV/AIDS has caused lost of knowledge in the affected areas, and to what extend? Hence, the study will focus on orphans and young farmers regarding pests¿ management in the high prevalence areas of HIV/AIDS in Benin. The study will be conducted by using Consensus analysis method to appreciate the knowledge base, and the RAAKS procedure for network and actors studying.