Storage condition of onion varieties, associated fungi with onion and their management to reduce storage loss

抄録

The experiment was conducted at the field and store house of Spices Research Centre, BARI, Shibganj, Bogura, Bangladesh during 2018-20 to identify post-harvest onion bulb associated fungi in storage and to find out the effective control measures to overcome the storage loss as well as to increase shelf-life of onion bulb. The field experiment was conducted for producing bulbs of BARI Piaz-1, BARI Piaz-2, BARI Piaz-3, BARI Piaz-4 and BARI Piaz-5 which were used in store house. Six treatments viz. healthy and fresh bulb, bulb treatment with Cabriotop (0.3%), with Provax 200 WP (0.25%), with Amistar Top 325 SC (0.1%) and Autostin DF (0.2%), and control were used in store house. Aspergillus niger was the isolate of storage fungi in onion bulbs. Fungicides showed little bit effect on rotten and sprouted bulbs of all varieties on onion during the whole storage periods of control. But Autostin DF (Carbendazim) at 0.2% showed more effective among the fungicides. Summer onion varieties viz. BARI Piaz-2, BARI Piaz-3 and BARI Piaz-5 showed more than 50% rotten and sprouted bulbs at 32 DAI in storage. But winter onion varieties viz. BARI Piaz-1 and BARI Piaz-4 showed 20 - 30% rotten and sprouted bulbs at 160 DAI in storage. Among the winter varieties, BARI Piaz-4 was more stable and good compared to BARI Piaz-1. Among the summer varieties, sprouted bulbs were more than rotten bulbs, but rotten bulbs were more than sprouted bulbs in winter varieties.