Antifungal and antibacterial activity of extracts from the husk of Carya cathayensis

Key words: 
• forest protection /
• Carya cathayensis /
• extracts from husk /
• antifungal activity

Abstract: The last research showed the husk of Carya cathayensis contained compounds which can control fungi and bacteries. The antifungal and antibacterial activity of methanol extract from the husk of Carya cathayensis was tested with Botrytis cinerea, Alternaria solani, Fusarium oxysporum f.cucumerinum, Colletotrichum lagenarium, Fusarium oxysporum f.vasinfectum, Pyricularia oryzae, Exserohilum turcicum, Bipolaris maydis, Valsa mali, Fusarium graminerum, Rhizoctinia solani, Sclerotinia sclerotiorum, Sclerotinia sclerotiorum, Venturia nashicola and Phytophora capsici by growth speed rate method. Results showed that the extract from the husk of Carya cathayensis in a concentration of 100 g·L-1 had 100% inhibition rates on hyphae growth of Colletotrichum lagenarium, Sclerotinia sclerotiorum, Valsa mali, Phytophthora capsici, whereas, except Bipolaris maydis, there was greater than 69% inhibition rates on the other 10 fungi. The virulence test for six of the 15(Sclerotinia sclerotiorum,Fusarium graminerum,Rhizoctinia solani, Pyricularia oryzae, Exserohilum turcicum, Botrytis cinerea) tested plant pathogens showed that the antifungal activity of the methanol extract from the husk of C. cathayensis was the highest against Rhizoctinia solan with a median effective concentration required to induce a 50% effect (CE50) of 29.8 g·L-1; next was against Botrytis cinerea(CE50 of 31.1 g·L-1), and the lowest was against Exserohilum turcicum(CE50 of 46.2 g·L-1). Thus, research and development of botanical fungicides using the husk of Carya cathayensis should be studied further.