Evaluation of fluopyram for the control of in sugar beet.

Fluopyram, a succinate dehydrogenase inhibitor fungicide, has shown potential in controlling and in tomato. The effectiveness of this compound for the control of in sugar beet was evaluated. In this study, laboratory, growth chamber, glasshouse, and field experiments were conducted. In a motility bioassay, the EC value was determined with 3.00 μg/ml a.i. after 72 h exposure to fluopyram. The growth chamber experiment did not show any effects on penetration rate; however, field experiments revealed a positive effect of fluopyram applied at planting in reducing infectivity. The glasshouse experiment confirmed a limited effect of fluopyram on population development. Under field conditions, despite a reduction of penetration rates in spring, fluopyram was not effective in reducing the population development until harvest. Consequently, densities in plant tissue and soil were high at harvest and not different among treatments. However, root-rot symptoms were significantly reduced at harvest. Fluopyram applied at planting showed good potential to reduce root-rot symptoms caused by in sugar beet. However, for the long-term reduction of nematode populations in soil, further integrated control measures are needed to reduce the risks of substantial yield losses by . Fluopyram, a succinate dehydrogenase inhibitor fungicide, has shown potential in controlling and in tomato. The effectiveness of this compound for the control of in sugar beet was evaluated. In this study, laboratory, growth chamber, glasshouse, and field experiments were conducted. In a motility bioassay, the EC value was determined with 3.00 μg/ml a.i. after 72 h exposure to fluopyram. The growth chamber experiment did not show any effects on penetration rate; however, field experiments revealed a positive effect of fluopyram applied at planting in reducing infectivity. The glasshouse experiment confirmed a limited effect of fluopyram on population development. Under field conditions, despite a reduction of penetration rates in spring, fluopyram was not effective in reducing the population development until harvest. Consequently, densities in plant tissue and soil were high at harvest and not different among treatments. However, root-rot symptoms were significantly reduced at harvest. Fluopyram applied at planting showed good potential to reduce root-rot symptoms caused by in sugar beet. However, for the long-term reduction of nematode populations in soil, further integrated control measures are needed to reduce the risks of substantial yield losses by .