This research work was carried out in the farm "The Pacific", district and province of Lamas, San Martin Region, in soil texture sandy clay loam, with median availability of elements (NPK), with dry and wilt problems of lettuce plants (Lactuca sativa L.). Objectives: 1. Identify and describe the causal agent of wilt and dry lettuce (Lactuca sativa L.) under laboratory conditions at the National University of San Martin - Tarapoto. 2. - Identify and describe the causal agent of wilt and dry lettuce (Lactuca sativa L.) under laboratory conditions at the National University of San Martin - Tarapoto. The experimental design was completely randomized block with 4 treatments and 3 replications T1 (traditional seedbed and planting bare root), T2 (seedbed planting in trays and covered root (humus 2 * 1)), T3 (seedbed planting in buckets and root cover (2% formalin)), T4 (seedbed planting in tray...