Evaluation of Different Fungicides Against Powdery Mildew of Pumpkin (Cucurbita moschata L.)

Abstract

Erysiphe cichoracearum and Sphaerotheca fuliginea are the primary pathogens responsible for powdery mildew in pumpkin (Cucurbita moschata L.), a major fungal disease leading to substantial yield losses. The severity and disease development in pumpkin have led to severe yield losses; hence, a detailed study to assess the efficacy of systemic fungicides and combined fungicides under In vitro conditions is very important. The present study was undertaken during the Zaid and Kharif seasons of 2024–25 to evaluate the efficacy of selected fungicides under field conditions and their effect on mycelium germination inhibition. A total of six fungicides were tested against powdery mildew, and all treatments significantly reduced disease intensity compared to the untreated control. Among them, three sprays of Triadimefon + Bitertanol (Trooper 75 WP) at 0.2% emerged as the most effective treatment, recording the lowest mean Per cent Disease Intensity (PDI) of 19.01%. This was followed by Propiconazole 25% EC + Hexaconazole (Cantof 5% EC) at 0.1% and Myclobutanil (Systhane 10 WP) at 0.2%, with mean PDIs of 22.22% and 27.89%, respectively. Based on the overall disease control performance and disease suppression, Triadimefon + Bitertanol and Propiconazole + Hexaconazole can be recommended for the effective management of powdery mildew in cucumber under field conditions. These treatments can contribute to improved plant health and potentially higher yields when integrated with proper cultural practices. These findings indicate that the use of systemic and combination fungicides can provide effective management of powdery mildew in cucumber, thereby contributing to healthier crops and improved yields under field conditions.