Phytotoxicity of fungicide coated sugar beet seed depends on growth condition.

Abstract

Fungicide-coated seed protects sugar beet plants from soilborne diseases, but seedlings coming from coated seeds often encounter phytotoxicity under field conditions. To understand the phytotoxic impact, fungicide-coated seed and the uncoated seed of two cultivars were sown with holes or no holes in plastic trays in greenhouse conditions. Our study demonstrated without fungicide coat on sugar beet seed and holes in plastic trays resulted in just above 90% germination. While fungicide-coated seed and no hole's underneath trays- showed the lowest germination (>20%). Fungicide-coated seed, having holes in plastic trays showed 90% germination. No fungicide coat on seed, having no hole's underneath trays showed 70% germination. We further estimated the percentage of stunted seedlings in both cultivars. Fungicide-coated seed with holes underneath plastic trays showed above 5% stunted seedlings while fungicide-coated seed, having no hole's underneath trays- showed the highest percentage of stunted seedlings (>10%) in both cultivars. In summary, our data demonstrated that the phytotoxicity of fungicide-coated sugar beet seed depends on growth conditions.

High doses of fungicide on sugar beet seeds are less effective to Rhizoctonia solani at greenhouse condition.

“…Conversely, this study provided evidence of phytotoxicity of high doses fungicide coated sugar beet seed. Previously, our research group demonstrated that the germination of sugar beet seed inhibited due to fungicide coat on seed compared to uncoated sugar beet seed, but the phytotoxic mechanism was not examined (Haque and Parvin 2022). Again, there is a concern with inappropriate doses of fungicides which might trigger the development of new resistant biotypes of R. solani.…”