Gum arabic production by growing Hashab trees (Acacia senegal), contributs 12% to the GDP of Sudan and is threatened by drought and insect attack. To solve this problem, Maymoona Ahmed Eisa suggested to increase knowledge diffusion on insect pests in A. senegal and call for governmental and non governmental effort to encourage farmers to reestablish Hashab trees. Broomrape Phelipanche ramosa is an obligate root parasite. It is considered to be the most pestiferous of all Phelipanche spp due to ist high seed production, vigorous growth and lack of natural enemies. In a pot experiment, Tilal Abdelhalim studied arbuscular mycorrhizal fungi as a possible biological control agent in tomatoes. Colonization of tomato roots with three myccorhizal fungi Glomus spp suggested a potential to reduce seed germination. Still talking of tomatoes, there is no single control measure for bacterial wilt. Taking on this challenge, Henok Kurabachew tested the effect of silicon and a rhizobacteria. Silicon proved to be more effective than the rhizobacteria. Further, a dual apllication showed antagonistic effects unlike the application of one agent only. The last talk left the audience speechless. Eric Rahn presented his study on pesticide use risk indicators. He tested identified indicators in the case of smallholder potato farmers in Colombia for a first screening tool. As a conclusion it showed that more simple indicators cannot be used as reliable proxis for more complex ones. On the other hand, a combination of indicators would better characterize pesticide risks.