The effectiveness of four sprayer types to control Alternaria leaf spot disease of cucumber using Rovral TS (Iprodione ۳۵% + Carbendazim ۱۷.۵%) fungicide under greenhouse conditions

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 ۳۵% + Carbendazim ۱۷.۵%) 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 ۳, ۵, and ۷ days after application; the resulting data were statistically analyzed. The results indicated that the ۱۰۰-liter trolley sprayer used the highest volume of solution (۶۰۳ L/ha), while the electrostatic atomizer used the least (۱۹۵ 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 ۳۳.۸۳%. Followed by the trolley sprayer (۳۴.۹۹%), the atomizer with a microner head (۳۶.۳۹%), and the atomizer with a standard head (۳۷.۵۰%). 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.

کلیدواژه ها:

Iprodione ، Management ، Residue ، Vegetable crops