EDITING STANDARDIZATION ON TEMPERATURE AND TIME FOR HOT WATER TREATMENT OF SELECTED CROPS AGAINST SEED BORNE DISEASES

Abstract

The experiment was conducted at the Central Laboratory of the Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, during July 2014 to December 2015. Effect of hot water treatment at different temperatures with varying durations on important seed-borne pathogens of rice, wheat, country bean, tomato and eggplant seeds were studied. Seeds dipping in hot water at 50 to 60° e for 5, 10 and 15 mins were evaluated for standardization of temperature and time for controlling seed-borne pathogens. Hot water treatment at 53/ 54°C for 15 mins gave the highest seed germination (90%) and completely eradicated seed infection by Bipolaris oryzae and Fusarium spp. of rice seed. Wheat seeds dipped in hot water at 51 / 52°e for 10 min yielded the maximum seed germination (90%) and reduced seed infection of Bipolaris sorokiniana and Fusarium spp. For country bean, 55 156°C for 15 mins was found effective with the highest seed germination (85%) and no seed infection of Aspergilus niger. In case of tomato and eggplant seeds 53 / 54°C for 15 mins gave the highest seed germination (88%, 90%, respectively) and no seed infection (0.0%). Hot water treated seeds sown in the pot soil gave 33.75%,200/0,21.5%,22.5% and 20% higher seed germination, respectively for rice, wheat, country bean, tomato and eggplant in comparison to untreated control. Therefore, hot water treatment of specific temperature may be suggested for controlling important seed-borne pathogens of rice, wheat, country bean, tomato and eggplant seeds for enhancing seed germination and reduction of seed infection.