Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were...Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were then subjected to an in vitro test for their effectiveness on mycelia growth inhibition against some important plant pathogenic fungi such as Alternaria alternata, Colletotrichum gloeosporioides, Fusarium oxysporum fsp. lycopersici, Sclerotium rolfsii, Phytophthora infestans and Pythium sp. in comparison to commercial fungicides such as copper oxychloride and mancozeb. Reduction of the fungal growth was significantly obtained with C. longa extracts and the best median effective inhibitory concentration (IC50) value of 6.07, 6.50 and 7.13 mg/ml was from the ethanol extract for S. rolfsii, C. gloeosporioides and F. oxysporum fsp. lycopersici respectively. While all extracts from C. alata were almost the least effective against these fungi. The efficacy of C. longa extracts therefore, provided an alternative regime for the control of the fungal diseases and a promising appreciable choice for a replacement of chemical fungicides.展开更多
利用麦田常用的骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁7种除草剂,探讨其对小麦纹枯病菌菌丝生长的抑制作用及致病力的影响。结果表明:骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁的EC50分别为7.03、26.38、67.20...利用麦田常用的骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁7种除草剂,探讨其对小麦纹枯病菌菌丝生长的抑制作用及致病力的影响。结果表明:骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁的EC50分别为7.03、26.38、67.20、88.05、199.35、1 249.55和203.31 m g.L-1。在50 m g.L-1浓度下,对菌核数的抑制率分别为86.3%、57.8%、74.5%、73.5%、71.6%、55.9%和63.7%;对小麦纹枯病菌侵染力的抑制率分别为44.83%、25.00%、14.66%、-1.00%、31.03%、35.34%和25.86%。显微镜观察表明:经除草剂处理后,菌丝细胞形态均发生不同程度的异常变化,骠马可延迟菌丝侵入叶鞘细胞的时间,并影响菌丝向邻近细胞扩展。展开更多
文摘Crude plant extracts of ringworm cassia, Cassia alata L. and turmeric, Curcuma longa L. were prepared by either hot water or organic solvents such as ethanol and ether. Various concentrations of the crude extract were then subjected to an in vitro test for their effectiveness on mycelia growth inhibition against some important plant pathogenic fungi such as Alternaria alternata, Colletotrichum gloeosporioides, Fusarium oxysporum fsp. lycopersici, Sclerotium rolfsii, Phytophthora infestans and Pythium sp. in comparison to commercial fungicides such as copper oxychloride and mancozeb. Reduction of the fungal growth was significantly obtained with C. longa extracts and the best median effective inhibitory concentration (IC50) value of 6.07, 6.50 and 7.13 mg/ml was from the ethanol extract for S. rolfsii, C. gloeosporioides and F. oxysporum fsp. lycopersici respectively. While all extracts from C. alata were almost the least effective against these fungi. The efficacy of C. longa extracts therefore, provided an alternative regime for the control of the fungal diseases and a promising appreciable choice for a replacement of chemical fungicides.
文摘利用麦田常用的骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁7种除草剂,探讨其对小麦纹枯病菌菌丝生长的抑制作用及致病力的影响。结果表明:骠马、丁草胺、使它隆、麦乐宁、亿力、百草敌和麦草宁的EC50分别为7.03、26.38、67.20、88.05、199.35、1 249.55和203.31 m g.L-1。在50 m g.L-1浓度下,对菌核数的抑制率分别为86.3%、57.8%、74.5%、73.5%、71.6%、55.9%和63.7%;对小麦纹枯病菌侵染力的抑制率分别为44.83%、25.00%、14.66%、-1.00%、31.03%、35.34%和25.86%。显微镜观察表明:经除草剂处理后,菌丝细胞形态均发生不同程度的异常变化,骠马可延迟菌丝侵入叶鞘细胞的时间,并影响菌丝向邻近细胞扩展。
