MANAGEMENT OF LATE BLIGHT OF TOMATO THROUGH SELECTED BOTANICALS AND CHEMICAL FUNGICIDES

Abstract

An experiment was conducted in the Department of Plant Pathology at Sher-eBangla

Agricultural University (SAU), Dhaka-1207, Bangladesh; during November 2015 to May 2016 to find out the management options of late blight of tomato through selected botanicals and chemical fungicides. The hybrid variety of tomato named Rio grand was used for the present study. The experiment was conducted with 8 treatments viz. T 1 (Mahogany seed extract @ 1:6 w/v), T (Neem leaf extract @ 1:3 w/v), T 3 (Papaya leaf extract @ 1:3 w/v), T (Marigold leaf extract @ 1:3 w/v), T 5 (Ridomil Gold @ 0.2%), T 6 4 (Topgan @ 0.7%), T (Dithane M 45 @ 0.45%), and T (Control). The experiment was carried out at Randomized Complete Block Design (RCBD) with three replications. Ridomil Gold @ 0.2% resulted promising performances in reducing disease incidence (85.98%) and disease severity (82.82%) of late blight of tomato over control. Ridomil Gold showed the highest plant height (127.80 cm), number of branches plant 8 (15.72), number of fruits plant -1 (34.56), fruit yield plant -1 7 -1 2 (3.41 kg) and fruit yield ha

(72.84 t) compared to control. Among the botanicals assayed in the experiment,

-1Neem leaf extract @ 1:3 w/v showed effective control against late blight of tomato. Considering the performances of plant extracts and chemical fungicides evaluated in the experiment, Ridomil Gold (0.2%) as chemical fungicide and Neem leaf extracts as botanical could be suggested for the growers for management of late blight of tomato.