Different Plant Extracts Against the Early Blight (Alternaria solani) on Tomato (Solanum lycoperisicum)

บทคัดย่อ

Alternaria solani, the causal agent of early blight disease, is one of the most destructive pathogens of Solanumm lycopersicum and reduces productivity by approximately 80%. The aim of this study was to assess the efficiency of three different plant extracts to control Alternaria solani on tomato under field conditions. A Randomized Complete Block Design (RCBD) was used with four replications and four treatments, namely Allium sativum L., Carica papaya, Azadirachta indica, and control (water). Allium sativum L. (Garlic), Carica papaya (paw paw) and Azadirachta indica (Neem) extracts were observed to be more effective on disease severity and disease incidence during week four with a significant difference (P<0.01) compared to the control treatment. The plot treated with Carica papaya showed the highest total yield, followed by Azadirachta indica and Allium sativum L. (1052.8g, 639.8g, and 566.8g, respectively) with significant differences (P<0.01) while the control treatment produced 265g. The application of plant extracts revealed a significant reduction of early blight disease as well as an increased total yield of tomatoes compared to the control treatment.