Abstract
Fluopyram, a succinate dehydrogenase inhibitor fungicide, has shown potential in controlling Meloidogyne incognita and Rotylenchus reniformis in tomato. The effectiveness of this compound for the control of Ditylenchus dipsaci in sugar beet was evaluated. In this study, laboratory, growth chamber, glasshouse, and field experiments were conducted. In a motility bioassay, the EC50 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 D. dipsaci penetration rate; however, field experiments revealed a positive effect of fluopyram applied at planting in reducing D. dipsaci infectivity. The glasshouse experiment confirmed a limited effect of fluopyram on D. dipsaci population development. Under field conditions, despite a reduction of D. dipsaci penetration rates in spring, fluopyram was not effective in reducing the population development until harvest. Consequently, D. dipsaci 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 D. dipsaci 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 D. dipsaci.
Highlights
Fluopyram is a succinate dehydrogenase inhibitor fungicide inhibiting fungal respiration (Avenot et al, 2012)
The growth chamber experiment did not show any effects on D. dipsaci penetration rate; field experiments revealed a positive effect of fluopyram applied at planting in reducing D. dipsaci infectivity
Nematicides with fluopyram as the active ingredient are registered in several countries to control plant-parasitic nematodes such as Meloidogyne incognita or Rotylenchus reniformis
Summary
Fluopyram is a succinate dehydrogenase inhibitor fungicide inhibiting fungal respiration (Avenot et al, 2012). Nematicides with fluopyram as the active ingredient are registered in several countries to control plant-parasitic nematodes such as Meloidogyne incognita or Rotylenchus reniformis. A suspension concentrate formulation, containing fluopyram at 500 g a.i./L (MOON PRIVILEGE), was supplied by Bayer CropSciences Schweiz AG (Zollikofen, Switzerland). This formulation was already registered for use on tree crops, floriculture crops, and vegetable crops in Switzerland (FOAG, 2019). After 72 h exposure to fluopyram, nematodes were washed with water over a 20 μm sieve, and after further 24 h incubation in water, the number of motile/immotile D. dipsaci was recorded to determine their recovery in motility (Faske and Hurd, 2015)
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