Selection of some fungal pathogens for biological control of Trianthema portulacastrum L., a common weed of vegetable crops

2016-08-26T16-20-48Z
Source: Journal of Applied Biology & Biotechnology
Gaddeyya Gandi Pilli, P. K. Ratna Kumar, Bharathi Pilaka.
ABSTRACT Trianthema portulacastrum Linn. is a weed plant of aizoaceae (Fig marigold family). It is indigenous to South Africa but widely distributed in India, Sri Lanka and tropical and subtropical areas as a noxious weed. The mycoflora namely Alternaria alternata (Fr.) Keissler., Colletotrichum capsici (Syd.) E.J. Butler & Bisby., Bipolaris maydis (Y.Nisik. & C.Miyake) Shoemaker., Curvularia lunata (Wakker) Boedijin., Curvularia tuberculata Sivan. and Gibbago trianthemae E.G. Simmons was isolated from highly infected portions of the weed. The pathogenicity of various fungal species was confirmed by Kochs postulates. The host specificity of the isolates of horse purslane was tested on green house plants by spore treatment. Among the isolates, Gibbago trianthemae was highly aggressive to weed and it was considered as potential biocontrol agent (Mycoherbicidal agent) against horse purslane weed.


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