Sensitivity of Meloidogyne incognita and Rotylenchulus reniformis to Fluopyram

摘要

Fluopyram is a succinate dehydrogenase inhibitor (SDHI) fungicide that is being evaluated as a seed treatment and infurrow spray at plantingon row crops for management of fungal diseasesand its effect on plant-parasitic nematodes.Currently, there are no data on nematode toxicity, nematode recovery, or effects on nematode infection for Meloidogyne incognita or Rotylenchulus reniformis after exposure to low concentrations of ?uopyram.Nematode toxicity and recovery experiments were conducted in aqueoussolutionsof ?uopyram, whileroot infection assayswere conducted on tomato.Nematodeparalysiswas observedafter 2 hrof exposure at 1.0 mg/ml ?uopyram for both nematode species.Using an assay of nematode motility, 2-hr EC50 values of 5.18 and 12.99mg/ml?uopyramwere calculated for M.incognitaandR.reniformis,respectively.Nematoderecovery in motilitywasgreaterthan 50% for M.incognita and R.reniformis 24 hr after nematodeswere rinsed and removed from a 1-hr treatment of 5.18 and 12.99 mg/ml ?uopyram, respectively.Nematode infection of tomato roots was reduced and inversely proportional to 1-hr treatments with water solutions of ?uopyram at low concentrations, which ranged from 1.3 to 5.2 mg/ml for M.incognita and 3.3 to 13.0 mg/ml for R.reniformis.Though ?uopyram is nematistatic, low concentrations of the fungicide were effective at reducing the ability of both nematode species to infect tomato roots.