Studies on the control of paddy blast caused by Piricularia oryzae (Bri et Cav.) . 2. A technique of screening fungicides

Marks, G.C.; Peiris, J.W.L.

Tropical​ ​Agriculturist 115(2): 145-155


ISSN/ISBN: 0041-3224
Accession: 014207154

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A method of evaluating the relative efficacy of fungicides against blast in the field is described and the results of a series of experiments evaluating the efficiency of various formulations of organic mercurials are given. Of the fungicides tested, phenyl mercuric acetate and phenyl mercuric para-toluene sulphon anilide dusts were the most effective, while among the liquid formulations phenyl mercuric dinapthyl methane disulphonate, phenyl mercuric acetate and phenyl mercuric para-toluene sulphon anilide were effective. The ethyl compounds, ethyl mercuric chloride dust and ethyl mercuric phosphate dust were superior to the wettable phenyl compounds but inferior to phenyl dusts. The main types of phytotoxic reactions of mercury formulations are described. The tests on the varietal resistance of paddy to phytotoxicity caused by mercurial fungicides reveal that at the tillering stage, the phenyl dust formulations are toxic to many indica varieties. The japonicas tested are resistant. The wettable phenyl formulations showed less toxicity while the ethyl compounds were not toxic.