Restraining Effects of 32 Plant Extracts on Common Plant Pathogenic Fungi

[Objective] The plant resources with inhibition effect was screened on plant pathogen so as to search new type botanical fungicide.[Method] With the extracts of acetone and ethanol of 32 plants as materials and with 5 plant pathogens of Fusarium xysporum f.sp.diathi,Fusariun oxysporum,Alternaria alternata(Fries) Keissler,Alternaria sp.,Fusarium decemcellulare Brick as the tested strains,the biological activity of plant extract was determined on 5 pathogens.[Result] When the tested quality concn.was 0.035 g/ml,the inhibition rates of Magnclia grandiflora Lima,Buxus microphylla,Platycladus orientalis(Linn.) Franco,Pinus taeda linn.and Pistacia chinensishad extracts on all mycelium growth of tested strains were above 50%,among them the antibacterial activity of Pinus taeda linn extract was best and its inhibition rate was 60% on 4 tested strain at least and that was bigger than 70% on 2 tested strain.When the tested quality concn.was 0.1 g/ml,the inhibition of M.grandiflora Lima,B.microphylla,P.taeda extracts on spore germination was remarkable with their inhibition rate above 80%.[Conclusion] The effect of plant extracts of M.grandiflora,B.microphylla,P.taeda.on the mycelial growth and spore germination of pathogenic fungi were better.