In order to investigate the antifungal activity of pepper plant seeds extracts against Botrytis cinerea
Pers，the ethanol extract of pepper plant seeds was studied against all growth stages of Botrytis cinerea Pers in vitro．
The results indicated that 4 pepper plant seeds had strong antifungal activity agaist Botrytis cinerea Pers. The white
pepper extract showed more inhibition on mycelium growth of Botrytis cinerea Pers than that of Piper longum
L.，black pepper and Piper sarmentosum Roxb. with EC₅₀ at 0.007 9 g·mL^-1．The inhibition ratios of extracts
of Piper longum L. and Piper sarmentosum Roxb. on spore product were 92.8% and 92.0% at 0.5 g·mL^-1．The
antifungal activity of black pepper and white pepper extract on spore germination were higher than that of Piper
longum L. and Piper sarmentosum Roxb．Sclerotium product was inhibited，when the extract concentration of 4
pepper plant seeds was higher than 0.062 5 g·mL^-1．