Impact of Humic Acid and Putrescine Application on Disease Severity and Inhibition in Sesame Phyllody

Sesame is an ancient crop used for edible oil. The crop contains multiple antioxidants and is well known for its medicinal value. Sesame plants can be affected by various diseases, among which sesame phyllody, caused by phytoplasma, poses a severe threat and economic losses. These bacteria feed on the phloem region and can be transmitted by different plant hoppers. In the present study, two growth regulators were applied in various combinations. Disease inhibition was calculated, and areas under the disease progress curve were prepared for different treatments 10, 20, and 30 days after the 3rd spraying. Among all the treatments, the T12-Humic acid (1000 ppm) + putrescine (150 ppm) combination provided significant control of the disease, followed by T16-humic acid (500 ppm) + putrescine (50 ppm) during the same period..