Ali, A. (2025). Effectiveness and Residue Behavior of Selected Fungicides for the Control of Tomato Early Blight and Yield Improvement. Journal of Plant Protection and Pathology, 16(5), 237-246. doi: 10.21608/jppp.2025.380401.1340
A. M. Ali. "Effectiveness and Residue Behavior of Selected Fungicides for the Control of Tomato Early Blight and Yield Improvement". Journal of Plant Protection and Pathology, 16, 5, 2025, 237-246. doi: 10.21608/jppp.2025.380401.1340
Ali, A. (2025). 'Effectiveness and Residue Behavior of Selected Fungicides for the Control of Tomato Early Blight and Yield Improvement', Journal of Plant Protection and Pathology, 16(5), pp. 237-246. doi: 10.21608/jppp.2025.380401.1340
Ali, A. Effectiveness and Residue Behavior of Selected Fungicides for the Control of Tomato Early Blight and Yield Improvement. Journal of Plant Protection and Pathology, 2025; 16(5): 237-246. doi: 10.21608/jppp.2025.380401.1340
Effectiveness and Residue Behavior of Selected Fungicides for the Control of Tomato Early Blight and Yield Improvement
Plant Protection Department, Faculty of Agriculture, Minia University, Minia, Egypt.
Abstract
Field experiments were undertaken in Behdal district, Minia Governorate, Egypt, to assess the efficacy and residual activity of seven fungicides in controlling tomato early blight (Alternaria solani) and their subsequent influence on tomato yield during the summer 2023 and winter 2024 growing seasons. The fungicides tested included mancozeb, azoxystrobin, tebuconazole, difenoconazole, pyraclostrobin, cyproconazole, and dimethomorph at application rates of 0.5X, 1X, 1.5X, and 2.0X the recommended field rate. Mancozeb exhibited the highest efficacy, followed by azoxystrobin, tebuconazole, and difenoconazole, while pyraclostrobin, cyproconazole, and dimethomorph showed lower effectiveness. All fungicides significantly reduced disease severity and increased yield compared to untreated controls. Residue analysis revealed initial deposits on fruit surfaces at the recommended rate as follows: 0.188 ppm for azoxystrobin, 0.120 ppm for dimethomorph, 0.123 ppm for mancozeb, and 0.186 ppm for difenoconazole, increasing to 0.309, 0.230, 0.228, and 0.309 ppm, respectively, at the doubled rate. Half-life values (RL50) ranged from 5.18 to 7.02 days at the recommended rate and from 6.99 to 8.35 days at the doubled rate. Residues of azoxystrobin, dimethomorph, mancozeb, and difenoconazole remained below MRLs for both rates, ensuring safety for consumption. These results confirm the suitability of these fungicides for managing early blight in tomatoes while ensuring safe residue levels.
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