One of the most significant diseases, Ramularia blight is brought on by Ramularia foeniculli and results in significant yield loss due to the fennel plants' reduced ability to photosynthesize. Extracts from ten different plant species have been found to be effective in preventing blight on Foeniculum vulgare Mill. The majority of the plant extracts significantly reduced the disease when used at various concentrations (10%, 25%, and 50%) compared to the control. Azadirachta indica and Datura leaf extracts were proved to be incredibly effective when compared to other plant extracts. The extracts were found to work better at larger concentrations. The proportion of illnesses was also significantly reduced by adding additional chemicals and a few oil cakes to the soil. So, compared to cotton, mustard, til, or control, fennel grew better when treated with Biovita, Sawdust, and Neem cake. When it came to preventing crop disease, neem oil cake fared better than the others.