The SYP lost between 3 and 6% of its mass after 55 days of exposure to G. The SYP lost less than 5% of its mass after 55 days of exposure to Gloeophyllum trabeum when the tebuconazole content in the SYP reached 0.2 kg/m3, and the matrix identity had little effect on the results. Less concentrated suspensions delivered the nanoparticles quantitatively into the SYP while suspensions capable of delivering up to 0.8 kg of the fungicide (the active ingredient or AI) per cubic meter of SYP delivered 0.4–0.7 kg AI/m3, depending on the nanoparticle matrix. Southern yellow pine (SYP) was treated with these suspensions using conventional vacuum-pressure treatments.
The isolated nanoparticles were resuspended in water to yield suspensions able to deliver 0.1, 0.2, 0.4, and 0.8 kg fungicide/m3 of wood. The nanoparticle matrices were polyvinylpyridine (PVP), copolymers of PVP and styrene (PVP-co-St), and blends of PVP and hyperbranched polyesters (HBPs). Nanoparticles containing the fungicides tebuconazole or chlorothalonil were prepared with median diameters of ∼ 100–250 nm.
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