Of nine fungicides evaluated in vitro benomyl, thiabendazole, triadimenol and dazomet inhibited mycelial growth of Thielaviopsis basicola, but only dazomet at 40 and 80 ppm a.i. was fungitoxic. Fosetyl-Al and metham sodium greatly reduced fungal growth at 40 and 80 ppm a.i., wherease iprodione, vinclozolin and tolclofos-methyl were only slightly effective. The herbicides alachlor, metolachlor, metobromuron and pendimethalin were more active against the fungus than diphenamid. Several chemicals applied as soil drenches decreased the inoculum density of T.basicola after 45 days, but only benomyl and dazomet totally eradicated the pathogen. In greenhouse trials tobacco black rot was greatly reduced by benomyl applied as soil drenches after sowing and by triadimenol (10 and 20 ppm a.i.) applied 15 days before sowing; tolchlofos-methyl and fosetyl-Al were ineffective. Triadimenol and fosetyl-Al, when applied immedialtely after sowing, were phytotoxic. In a second experiment, triadimenol was more active when applied by soil drench than by root immersion.

Evaluation of chemicals against Thielaviopsis basicola on tobacco in vitro and in soil

TOSI, Laura;ZAZZERINI, Antonio
1992

Abstract

Of nine fungicides evaluated in vitro benomyl, thiabendazole, triadimenol and dazomet inhibited mycelial growth of Thielaviopsis basicola, but only dazomet at 40 and 80 ppm a.i. was fungitoxic. Fosetyl-Al and metham sodium greatly reduced fungal growth at 40 and 80 ppm a.i., wherease iprodione, vinclozolin and tolclofos-methyl were only slightly effective. The herbicides alachlor, metolachlor, metobromuron and pendimethalin were more active against the fungus than diphenamid. Several chemicals applied as soil drenches decreased the inoculum density of T.basicola after 45 days, but only benomyl and dazomet totally eradicated the pathogen. In greenhouse trials tobacco black rot was greatly reduced by benomyl applied as soil drenches after sowing and by triadimenol (10 and 20 ppm a.i.) applied 15 days before sowing; tolchlofos-methyl and fosetyl-Al were ineffective. Triadimenol and fosetyl-Al, when applied immedialtely after sowing, were phytotoxic. In a second experiment, triadimenol was more active when applied by soil drench than by root immersion.
1992
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/925236
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