Evaluation of different fungicides against Alternaria cucumerina causing leaf blight of bottle gourd (Lagenaria siceraria (Mol.) Standl.)

Abstract

Different contact and systemic fungicides were evaluated in vitro against Alternaria cucumerina. Amongst contact (non-systemic) fungicides evaluated maximum inhibition in mycelial growth was observed in mancozeb (99.98%) and thiram (99.98%) followed by copper oxychloride (87.60%). Among the different concentrations tried, Mancozeb and thiram showed strong inhibition at all concentration, while copper oxychloride gave 88.51% growth inhibition followed by copper hydroxide (85.51%) at 2500 ppm concentration. Out of seven systemic fungicides, propiconazole, difenoconazole and azoxystrobin found best with 99.98% mycelial growth inhibition followed by picoxystrobin (70.64%). Similarly, propiconazole, difenoconazole and azoxystrobin showed maximum inhibition of mycelial growth (99.98%) of the test fungus at all concentration.