International Journal of Plant & Soil Science

Marigold is infected with more than ten diseases all over the world. Flower blight, caused by Alternaria zinniae, is a severe threat to marigold cultivation in India and Odisha, resulting in economic losses. The research aimed to look at the efficacy of several botanicals that are readily available in in-vi tro circumstances. At 10% and 20% concentrations, eight plant extracts, including Aloe vera, Azadirachta indica, Allium sativum, Zingiber officinale, Curcuma longa, Phyllanthus emblica, Withania somnifera, and Ocimum tenuiflorum were tested against the pathogen. At a 10 percent concentration, Allium sativum inhibited mycelial growth the most, with 77.93 percent, followed by Phyllanthus emblica (63.38 percent), and Curcuma longa (53.99 percent). The least inhibited plant was Ocimum tenuiflorum, which showed 1.41 percent inhibition. The result at 20% concentration followed the same result as the 15% concentration. Allium sativum had the highest level of inhibition at 87.32 percent, followed by Phyllanthus emblica (85.92 percent) and Curcuma longa (73.71 percent). Ocimum tenuiflorum had the least inhibition, with 10.80 percent. The presence of Allicin in Allium sativum may explain its effectiveness against marigold flower blight, although more research is needed. Furthermore, the effective plant products against marigold flower blight could be evaluated in the field.