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Pesticide Research Journal
Year : 1989, Volume : 1, Issue : 1
First page : ( 27) Last page : ( 32)
Print ISSN : 0970-6763. Online ISSN : 2249-524X.

Antifungal Activity of O, 0-Bisaryl Isopropyl Phosphonates and Relationships Between Chemical Structure and Activity

Nidiry Eugene Sebastian J.1, Roy N.K.

Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, 110 012, India

1Present address: Indian Institue of Horticultural Research, Hessaraghatta, Bangalore.

Online published on 15 December, 2011.

Abstract

The fungitoxicity of twenty O, O-bisaryl isopropyl phosphonates aganst four important fungi, viz. H. oryzae, P. oryzae, A. alternate and F. solani was determined. Of these O, O-bis (2,4,5-trichlorophenyl)-and O, O-bis (pentachlorophenyl) isopropylphosphonates exhibited the highest activity. Structure-activity relationship of the phosphonates showed that changes in hydrophobicity of substituents with the phenyl ring (#x03A3;π) and molar refractivity of substituents at the para-position of the phenyl ring [MR (p)] accounted for the major percentage of variation in the fungicidal activity exhibited by the members of the series against above fungi.

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