Effect of different chemicals and biological agents for controlling fusarium basal rot of summer onion
The experiment was conducted at the Regional Spices Research Centre, BARI, Magura during 2020-21 and 2021-22 cropping seasons to investigate the effect of different chemicals and biological agent in controlling f basal rot disease of onion caused by Fusarium oxysporum f. sp. cepae. A significant difference in yield and yield attributes was observed among different treatments. The highest bulb yield of onion (11.78 t/ha in 202-21 and 13.03 t/ha in 2021-22) was found from the treatment T7 (Trichoderma mixed compost @ 500 kg/ha) followed by the treatment T4 [Eminent pro (Tetraconazole 12.5% + Carbendazim 15%) @ 0.1%] (12.22 t/ha in 2020-21 and 11.19 t/ha). Significantly higher plant height, number of leaves per plant, bulb diameter and individual bulb weight were recorded from T7 treatment followed by T5 treatment. The lowest disease incidence (6.60 % and 5.42 % in 2020-21 and 2021-22, respectively) were found in Trichoderma mixed compost @ 500 kg/ha treated plot followed by T4 treated plot (8.30% in 2021-22 and 6.99% in 2021-22) while the highest disease incidence (25.78 % and 22.11% in 2020-21 and 2021-22) was observed in the control plot. Application of Trichoderma mixed compost @ 500 kg/ha recorded the maximum disease reduction over control (74.38% in 2020-21 and 77.90% in 2021-22) followed by T4 (71.58% in 2021-22). It is concluded that the treatment Trichoderma mixed compost @ 500 kg/ha could be a better option for reducing fusarium basal rot of summer onion and increased bulb yield. Bangladesh J. Agril. Res. 49(3): 249-258, September 2024