Abstract

Various substances alter the activity of quintozene, tecnazene and dichloran towards Botrytis cinerea . The toxicity of tecnazene and dichloran is increased in agar gels, and in 0·1 % solutions of agar, sodium carboxymethylcellulose, sodium polypectate and gelatine; there are no similar effects with quintozene. A glucose/casein hydrolysate solution enhances the activity of dichloran, but not that of the other two fungicides. Less striking, but still pronounced effects are caused by tecnazene and dichloran in the presence of these high molecular weight substances, and nutrients.

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