Hexanic Extracts of Trametes versicolor (L.:Fr.) Pilát to Control of Tomato Powdery Mildew

The powdery mildew on tomato (Leveillula taurica) is one of the most important disease of this crop in Mexico, causing losses up to 40% on yield. There are no resistant tomato cultivars, so their control is based on use of chemical fungicides, mainly triazole fungicies. With the objective of obtaining new alternatives to control of this desease, concentrations of 5, 7.5 and 10% (v/v) of Hexanic extracts of Trametes versicolor developed on Luffa aegyptiaca were evaluated comparing their effectiveness (Abbott) with Amistar Gold® (0.5 L·Ha-1), Serenade Max® (5.0 kg·Ha-1) and a Control. Three applications were made every 7 days and the experimental design used was randomized complete blocks with 4 replicates. The percentage of damaged leaf area was evaluated with an Exprofeso scale with 0 to 6 indices 7 days after the first and second application and 7, 14 and 21 days after the third. The results obtained indicate that hexanic extracts offers a control of L. taurica, with average control of 47.41 and 57.82% and maximum of 58.16 and 65.09% on concentrations of 7.5 and 10% respectively, suggesting reduce the application interval from 7 to 5 days. The lowest concentration of extracts offered the less control of disease. L. aegyptiaca is considered to be an excellent substrate for the development and obtaining of mycelium of T. versicolor (R2: 0.9867). Phytotoxicity symptoms were not detected on the tomato crop cv Cid after applications of Hexanic extracts concentrations.