10种中草药提取物对合欢枯萎病菌的抑制作用

研究了10种中草药的乙醇提取物及两种化学杀菌剂对合欢枯萎病菌的抑制作用,初步分析了利用植物源农药防治合欢枯萎病的可能性.结果表明,同一药剂在不同浓度下(0.005、0.010和0.020g/mL)作用效果不同.其中丁香提取物对合欢枯萎菌的抑制效果最好,0.005 g/mL丁香提取物的抑菌率达到98.7%.0.010、0.020 g/mL浓度下,抑菌率均达到100.0%;大黄(68.6%,74.4%,83.1%),苦参(62.9%,76.7%,80.9%),甘草(63.8%,74.4%,98.7%),蛇床子(71.0%,78.8%,84.5%)的提取物在以上3种浓度下,对合欢枯萎菌的菌丝生长抑制作用均在60%以上,而两种化学药剂的抑制率最高只有46.0%和51.3%.显然,中草药提取物比化学药剂对合欢枯萎菌具有较好的抑制作用.

Inhibition of Ten Kinds of Chinese Medicaments to Fusarium oxysporum f.sp.Perniciosum

Inhibition of ten kinds of Chinese medicines'ethanol extract and two fungicides to Fusarium oxysporum f.sp.Pemiciosum was tested.It was preliminarily possible for plant pesticides to control Albizzia fusarium wilt.The results showed that the same medicines in different concentrations had different effects.Inhibition of clove extract to F. oxysporum wag the best.Its inhibit rates were 98.7% in 0.005g/mL,100% in 0.010 g/mL and 0.020 g/mL.Inhibit rates of rhubarb extract were 68.6%,74.4% and 83.1%,that of Oxymatrine extract were 62.9%,76.7% and 80.9%,that of Licorice extract were 63.8%,74.4% and 98.7%,that of Osthol extract were 71.O%,78.8%and 84.5% respectively.Inhibition rates of these four kinds of Chinese medicine extracts in three concentrations to Eoxysporum were more than 60%,while the best Inhibit rates of two chemical fungicides were only 46.0% and 51.3% respectively.It was clear that the Chinese medicines had better inhibition to F. oxysporum than fungicides.