Triazole Fungicides against Powdery Mildew of Fenugreek

Fenugreek (Trigonella foenum-graecum L.) is an imperative leguminous crop that is widely grown for its medicinal, culinary and nutritional benefits. However, powdery mildew, caused by the fungus Erysiphe polygoni, significantly looms fenugreek cultivation, resulting in substantial yield reductions and diminished quality of the harvested crop. Two foliar applications of the triazole fungicide tebuconazole 25.9% EC @ 0.1%, resulted in the lowest percentage disease index (PDI) of 15.3% and the highest disease control (PDC) of 83.7%, which was comparable to propiconazole 25% EC at the same concentration (PDI 8.0 and PDC 81.4%), followed by hexaconazole 5% SC at 0.1 % (PDI 9.0 and PDC 79.1 %). These treatments also positively influenced the seed yield of fenugreek and maximum B:C ratio (1.9) was recorded with tebuconazole 25.9% EC @ 0.1%. So, the group of triazole fungicides is among the most effective options for management powdery mildew disease.