The main purpose of this paper was to analyze recommendable technology package combining mineral and organic fertilizer that lead to agronomic and economic efficiency at farmer level. The test on six demonstration plots led to the conclusion that the treatment combining (15Kg N+15Kg P+10Kg K + 10Metric Tons of organic matter ) is efficient in Kalehe territory and Ruzizi plain because gives higher yields in terms of maize production with an average 5.3 MT of maize in Kalehe territory and 3.3MT in Ruzizi plain. Difference in yields for the two zones is mainly explained by the difference of potentials of soil productivity and production costs. Treatment combining (15Kg N+15KgP+10Kg K + 10MT Om) is the most productive in terms of additional yields that increases between 50 and 70% for Kalehe and between 15 and 36% in Ruzizi plain. On the economic aspect profitability of the same treatment (15Kg N+15KgP+10Kg K + 10 MT Om) is the highest in both zones Kalehe and Ruzizi plain. Average gross additional income attributable to the treatment combining the fertilizer package here above mentioned is 3,285$ per season and per hectar in Kalehe while the gross income attributable is 1,684$ in Ruzizi plain zones. Treatment (90KgN+30kgP+15kg K + 10MT om) is economically the most profitable in Ruzizi plain with 1,735 $/ha/harvest season. Estimated rate of financial return of treatment (15Kg N+15KgP+10Kg K + 10 MT Om) is 1.4 in Biriba, 2.8 in Kalehe-centre and 3.8 in Muhongoza. For treatment (90Kg N+30KgP+15KgK + 10MT of Om) the rate of financial return is 2 in Kiliba and 0.75 in Runingu for treatment (45KgN+15KgP+10Kg K + 10 MT of Om). It comes to the conclusion that technology package combining organic and mineral fertilizers increases significantly agronomic and economic efficiency. For farmers to increase yields and generate higher income these technology package are highly recommendable indeed.

The study was conducted in the region of Bugorhe whose purpose is to assess where the outbreak of Aphis fabae growing seasons and the method of observation, identification key, Past software and microsoft Excel were used. The duration is 12 weeks during the season of 2011 (September-December) and 2012 (September to December) and the B season of 2012 (February-May). Results show the months of November to October 2011, 2012 and March-April 2012 have a high incidence of black aphids while the months of September to December were lower in 2011, 2012 as February 2012, so the attack of aphids develop especially during dry in August to November and in September-November 2012, while in the rainy season (September 2011, October 2012 and December 2011 and 2012, April 2012), colonies of aphids are dense, destroyed by parasitic fungi Erynia neophides or Neozygites. Larvae or adult beetles and larvae Syrphis help control when they devour pucerons. Thus, the auspicious time of the attacks by black aphids Aphis fabae is dry season cropping seasons (A or B) as Aphis fabae can colonize many cultivated or so spontaneous means of struggle to provide growers with beans in the region Bugorhe plants are based sprays of dimethoate or specific aphicid as pyrimicarb and cultivators of beans are uprooted seedlings of upon detecting virus-infected beans.