TITLE:
Effectiveness of Ringworm Cassia and Turmeric Plant Extracts on Growth Inhibition against Some Important Plant Pathogenic Fungi
AUTHORS:
Porntip Wongkaew, Wantana Sinsiri
KEYWORDS:
Crude Plant Extracts; Cassia alata; Curcuma longa; Commercial Fungicides; Plant Pathogenic Fungi; Commercial Fungicides; Mycelia Growth Inhibition
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.5,
March
12,
2014
ABSTRACT: 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.