Effect of 2-allylphenol against Botrytis cinerea Pers., and its residue in tomato fruit

A new fungicide, 2-allylphenol, named Yinguo, which has been registered in China, was synthesized by simulating the natural antifungal chemical ginkgol. The formulation, Yinguo10% EC showed higher antifungal activity against Botrytis cinerea and Alternaria solani than the commercial fungicide, iprodione (50% WP) in vitro. Yinguo, at a dose of 800 mg kg−1 gave more than 85% and 90% control against gray mold on the leaf and fruit of tomato, respectively, in the greenhouse. The degradation rate and terminal residue levels in tomato fruit were determined with reverse phase high-performance liquid chromatography (HPLC) equipped with a ultraviolet (UV) detector. The half-life of 2-allylphenol in tomato fruit was about 6 d, and more than 82% of the initial deposit of 2-allylphenol had degraded in tomato fruit at harvest. The final residue levels in tomato fruit were less than 0.26 mg kg−1 following double application of the highest recommended dose.