Vol. 7, Issue 11, Part G (2025)

Onion (Allium cepa L.) is a bulbous, biennial crop and it is one of the most important crops grown in India. Many diseases affect the onion crop, incurring quality and quantity losses. Onion suffers from many post-harvest diseases causing accountable losses of about above 50%. The studies revealed that Aspergillus niger, Aspergillus flavus and Fusarium oxysporum f. sp. cepae were found responsible for causing black mold and bulb rotting during storage. The pathogens were successfully isolated on potato dextrose agar and pathogenicity was their proved on healthy onion bulbs, under moist chamber by pin prick method. While in field trial systemic and non-systemic fungicides and bioagents were sprayed and analysed for disease incidence in storage. The studies revealed that Hexaconazole 5% EC has given good amount of disease control followed by Carbendazim 12%+Mancozeb 63% (Saff). It can be concluded that pre harvest sprays of Hexaconazole or Carbendazim 12% +Mancozeb 63% (Saff) reduce the disease incidence significantly. In present investigations, the effect of preharvest sprays of fungicides and bioagents were also studied for incidence of rot disease in onion and it revealed that hecaconazole was at par with Carbendazim 12% +Mancozeb 63% (Saff) were found to significant over other treatments.