Abstract: Plant extracts from 73 species of 29 families of vegetables, flowers,trees, field crops and weeds were selected to test their fungitoxicity against eggplant Verticillium dahliae. Indoor bioassay and field experiment indicated that leaf extracts of Vitis amurensis and Allium fistulosum had stronger inhibitory effects on V. dahliae, with the inhibitory rate on its mycelium growth being 68.44% and 61.31%, respectively. The preventive effect of the two extracts (with the control effect of 75.76% and 71.72%, respectively) was equivalent to that of commercial pesticides. Branch and leaf extracts of Eugenia caryophyllata and Salix babylonica, leaf extracts of Mentha canadensis, Capsicum frutescens,Lycopersicom escutentum, Cucurbita moschata, Allium tuberosum, Juglans regia, Ginkgo biloba, Cirsium japonicum, Pogpstemon patchouli, Sonchus brachyotus and Tagetes erecta, root extract of Cleome spinosa, fruit extract of Zanthoxylum bungeanum, and pericarp extract of Citrus reticulata were also good in fungitoxicity, which could be regarded as optimal plant materials in screening botanical fungicides against other pathogens.

Key words: Plant, Atmosphere, Exchange processes, Inverse methods