Management
S. solani is most commonly controlled with the use of disease resistant cultivars, especially in tomato and cotton. Resistant tomatoes are marked with the code “St”. Varieties include Beefmaster, Better Boy, Celebrity, First Lady II, Floramerica, Jackpot, and Lemon Boy, Amelia, Crown Jewel, FL 47, FL 91, Linda, Phoenix, Quincy, RPT 6153, Sebring, Solar Fire, Soraya, Talledega, Tygress, and many others. Resistance is inherited via the gene Sm, a single dominant gene.
However, resistant cultivars may lack desirable traits, such as a tendency toward early bolting when allium flowers are desirable for markets. When satisfactory resistant cultivars are unavailable, fungicides (tebuconazole, procymidone) can be applied as a seed treatment to provide systemic early season management or as a foliar spray 2-3 times throughout the season. Triazole has been shown in laboratory studies to effectively control mycelial growth and provides local systemic protection. Risk of infection can also be reduced by delaying fall planting of garlic until temperatures fall below the 18°C optimal for S. solani growth, and good field sanitation.
Read more about this topic: Stemphylium Solani
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