In order to assess the long-term efficacy of supplemented organic fungicides in outdoor applications, additives - including the antioxidant butylated hydroxytoluene (BHT) and a UV absorber and free radical scavenger benzotriazole (BTA), were selected to mix with the fungicides propiconazole or tebuconazole. Freshly cut samples from four-year old bamboo stems were treated with combinations of the chemicals and biocides and were field-tested for mold growth over a24-weekperiod. Results showed that BHT greatly enhanced the effectiveness of tebuconazole against mold fungi, while it had little effect on mold colonization when combined with propiconazole. BTA reduced the mold resistance of tebuconazole, but greatly promoted the inhibition of mold by propiconazole. The effect of BHT and BTA appeared to enhance the mold resistance of both tebuconazole and propiconazole, but not necessarily when they were combined together.

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