![]() and Ornamental Fungicide are the old standby fungicides with Chlorothalonil. Serenade + Kocide provided good control for both the heterozygous and homozygous EBR lines, while Cabrio alternated with Serenade + Kocide performed well with all genotypes, and was significantly better for the homozygous EBR line. Early blight and leaf spot are two of the most common forms of fungus in the. There were significant differences among both the chemicals and genotypes tested. In the fungicide trial, Serenade + Cabrio provided slightly better control than Bravo Ultrex, but Serenade + Kocide did not provide adequate control. Chemical Action and Usages: Chlorothalonil is a organochlorine fungicide that is available in several different formulations and sold under the trade names of Daconil, Bravo and others. In the germplasm trial, Sonata alone did not provide adequate control for any genotype, while the Cabrio/Sonata treatment provided excellent control for all tomato entries.Įarly blight was much more severe in 2003 when the light phenotype was used. ![]() In the fungicide trial, Bravo Ultrex and Serenade + Kocide provided good control, while Sonata + Cabrio gave excellent control. The 2002 growing season was hot and dry, limiting EB development in both trials. tomatophila, while the light phenotype was used in 2003. In 2003 we evaluated tomato homozygous and heterozygous for EBR, and two susceptible tomato lines using Serenade + Kocide alone or alternated with Cabrio, plus an unsprayed control.īoth 2002 trials were inoculated with the dark phenotype of A. Sonata was applied alone or combined with Cabrio, plus an unsprayed control. Chlorothalonil (Ortho Multipurpose Fungicide or Fertilome. In an adjoining field in 2002, we tested two homozygous EBR tomato lines, a heterozygous EBR hybrid, and a susceptible tomato line. Applications should begin when the first fruit is slightly larger than a quarter. pumilus (Sonata) + Cabrio in 2002, and Serenade + Cabrio in 2003. For the conventional fungicide trials, the cultivar Supersonic was sprayed weekly with chlorothalonil (Bravo Ultrex), pyraclostrobin (Cabrio) alternated with Bravo Ultrex, the biological agent Bacillus subtilis (Serenade) + copper hydroxide (Kocide), B. Early blight, despite being misnamed, can emerge in abundance at any time during the growing season. These treatments, in both cases, are made of organic ingredients. Limited studies have compared the use of conventional and biological fungicides for early blight control, and the contribution of early blight resistance (EBR). Spray the plant thoroughly (especially the bottom of the leaves) with Bonide Liquid Copper Fungicide concentrate or Bonide Tomato & Vegetable. Most tomato cultivars ( Lycopersicon esculentum) are very susceptible to foliar infection with early blight (EB) caused by Alternaria tomatophila.
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