The effectiveness of four sprayer types to control Alternaria leaf spot disease of cucumber using Rovral TS (Iprodione 35% + Carbendazim 17.5%) fungicide under greenhouse conditions

Document Type : Original Article

Authors

1 Plant Diseases Research Department, Iranian Research Institute of Plant Protection, AREEO, Tehran, Iran

2 Pesticides Research Department, Iranian Research Institute of Plant Protection, AREEO, Tehran, Iran

Abstract

Cucumber is a significant crop in Iran, where Alternaria leaf spot can be a serious disease if not effectively controlled. This study evaluated the efficacy of four sprayer types in applying Rovral-TS fungicide (Iprodione 35% + Carbendazim 17.5%) against cucumber Alternaria leaf spot disease under commercial greenhouse conditions. The field assay was arranged as a factorial experiment using a randomized complete block design in four replications. Sprayer efficiency was assessed by physical evaluation, measuring solution consumption, and analyzing droplet deposition on sensitive cards placed on cucumber plants. Disease severity was rated before spraying and then at 3, 5, and 7 days after application; the resulting data were statistically analyzed. The results indicated that the 100-liter trolley sprayer used the highest volume of solution (603 L/ha), while the electrostatic atomizer used the least (195 L/ha). Physical assessment revealed that both the standard back atomizer and the electrostatic atomizer achieved better droplet deposition on plants with reduced drift compared to other sprayers. Although there was no significant difference in the disease severity index, the electrostatic atomizer achieved the lowest disease severity at 33.83%. Followed by the trolley sprayer (34.99%), the atomizer with a microner head (36.39%), and the atomizer with a standard head (37.50%). These results indicate that the electrostatic sprayer improves deposition of spray particles on the target plant through controlled droplet application, enhances spraying efficiency, and minimizes drift.

Keywords

Journal of Advances in Plant Protection
Volume 2, Issue 2
December 2025
Pages 37-44

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