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With the development of flue-cured and Burley tobacco culture in France, black root rot, caused by Chalaraelegans (Thielaviopsisbasicola), is becoming a problem. Since 1981 the Bergerac Tobacco Institute has studied the efficacy of new endotherapeutic fungicides of the triazole family. Among these, triadimenol was found to be the most effective. The treatment method consists of spraying tobacco plants with a triadimenolsolution 48 to 72 hours before transplanting. This method appears to be an economic and efficient means to control tobacco black root rot in the field. Treatment of young tobacco plants with triadimenol strongly stimulates rhizogenesis and this favours strengthening of the tobacco plants in the field.

The Chemical Control of Tobacco Black Root Rot