Linear canker is one of the diseases that attack cinchona plants a lot in the Territory of Lubero / North Kivu / DR Congo. It significantly reduces the productivity of its bark. In the fight against this attack, some farmers sterilize the soil with hot water, others warm it in a barrel. There are some who use Ridomil to treat the soil (earth). The objective of this study is to evaluate the effectiveness of these three techniques in the fight against Phytophthora cinnamoni in the Kagheri region, and to deduce the procedure that responds best in the fight against this attack. A treatment device for four repetitions was adopted. 16 plots arranged over 40.96m2 were set up. Data analyzes show that the attack rate at disease onset was 45% for T0, 17.5% for T2, and 6% and 1.2% for T1 and T3, respectively. The linear chancre rapidly progressed to T0 the first month of attack, then to 85% the third month, finally to 100% in the fourth; all the plants were attacked following climatic conditions characterized by heavy rains (humidity). While sterilization with ridomil was disappointing with a result of 17.5% the first month and 41% the last month. However, T1 and T3 were effective, with successively 6% and 1.2% of the onset of the disease at the beginning as well as at the end of the observations. The analysis of variance demonstrates that there is a significant difference between the blocks either Fcal a > Ftab with 4.61 > 3.86 at the 5% threshold, but without significant difference between the treatments at the same threshold either Fcal (b) < Ftab; 1.97 < 3.86 and between the other parameters with H0 accepted. It is appropriate to use the techniques of sterilization of the soil in the barrel and by hot water in order to increase the bark yield of cinchona.