The Effect of Fungal Preinfection on the Efficacy of Mold and Sapstain Control Products
2013
Uzunovic, Adnan | Dale, Angela | Stirling, Rod | Sidhu, Avtar
Efficient use of sapstain control products requires information on the effectiveness of the actives and formulations against different types of fungal challenges. The present work examines sapstain control product efficacy against spores, approaching mycelia, and established mycelia in laboratory experiments, and against preinfection in field experiments. Laboratory experiments found that 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT)/2-methyl-4-isothiazolin-3-one (MIT), 3-iodo-2-propynylbutylcarbamate (IPBC), and propiconazole applied prior to exposure to mold fungi were most effective against spores, less so against approaching mycelium, and least effective against live mycelia already present in wood prior to treatment. Field tests confirmed that sapstain was more difficult to control on wood preinfected with sapstain and mold. Although short periods of exposure prior to treatment may not affect efficacy, any delays between manufacture and treatment increase the risk of preinfection and should be avoided.
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