Antagonistic potential of rhizosphere mycoflora against Fusarial wilt of brinjal

Abstract

Antagonistic potentials of seven rhizoshere soil fungi viz., Aspergillus flavus Link., A. fumigatus Fresen., A. niger Tiegh., A. terreus Thom., Penicillium sp., Trichoderma harzianum Refat. and T. viride Pers. were tested against the Fusarium oxysporum Schlecht. and F. solani (Mart.) Sacc. – the two pathogens, isolated from wilted roots of brinjal plants. Out of seven soil fungi Trichoderma harzianum was found most effective to control the growth of both the test pathogens. More than 50% inhibition of the test pathogens were observed with T. viride, Aspergillus niger and A. fumigatus in colony interaction. The maximum inhibition of radial growth of the test pathogens was observed with volatile metabolites and cell free culture filtrates of Trichoderma harzianum. This fungus may be exploited commercially to control the disease.
 Dhaka Univ. J. Biol. Sci. 24(2): 137-145, 2015 (July)

Antagonistic potential of soil fungi as biocontrol agent against rice pathogens

“…The highest inhibition (57.36%) was recorded owing to T. harzianum against P. guepinii followed by F. moniliforme (46.80%), A. alternata (46%) owing to T. viride. The per cent inhibition owing to volatile metabolites of Trichoderma harzianum against the mycelial growth of C. lunata, D. oryzae, F. moniliformae, F. solani, M. oryzae, P. guepinii and S. oryzae were 46, 38.85, 37.14, 25, 36.25, 57.36 and 30.33 %, respectively.These results are in agreement with the findings Romana et al (2015) and Barakat et al (2013). Romana et al (2015) reported that highest inhibition of radial growth of F. solani and F. oxysporum was found due to T. harzianum followed by T. viride and A. niger, respectively.…”

“…It is known to be capable of producing antibiotics which might have suppressed the growth of the test pathogens. These findings are in consistent with the findings of Skidmore andDickinson (1976), Adriana andSergio (2001), Kexiang et al (2002), Krupke et al (2003), Shafiquzzaman et al (2009), Akter et al(2014, Bashar and Chakma (2014) and Romana et al (2015). Considering the findings of the present experiment, Trichoderma harzianum could be used as a commercial bio control agent against rice pathogens.…”

“…Aspergillus flavus Link, A. fumigatus Fresen., A. niger Tiegh., Penicillium sp., Trichoderma harzianum Refat and T. viride Pers. were isolated from the rhizosphere of the several healthy rice crop fields according to the method described by Romana et al (2015). They were selected to test their antagonistic potential against the pathogenic fungi following dual culture technique described by Bashar and Rai (1994).…”