Nematode Suppression and Peanut Yield Response to Velum Total in Different Rotation....(Jordan)

Nematode Suppression and Peanut Yield Response to Velum Total in Different Rotation Sequences in North Carolina
David Jordan, North Carolina State University
2020 APRES Annual Meeting Poster Presentation

Plant parasitic nematodes can have a negative impact on peanut (Arachis hypogaea L.) yield.
Cropping sequence can have a major impact on nematode populations and is an important
cultural practice to suppress populations. While fumigation can reduce populations, this
approach is expensive and requires addition certification and training beyond application of
most pesticides used in peanut. Velum Total (imidacloprid plus fluopyram) is currently registered
for in-furrow application in peanut. Research is limited in North Carolina relative to efficacy of
this insecticide-nematicide combination. In 2019, four rotation trials initiated from 1997-2000
with a wide range of crop rotation schemes were planted with peanut to determine if cropping
sequence and in-furrow application of nematicide treatments interacted to impact peanut yield
and nematode populations in soil. Depending on cropping sequence, root-knot nematode
populations in soil collected in mid-September 2019 after peanut ranged from no detectable
nematodes to approximately 2,800 nematodes/500 cm3. Cropping sequence had a major impact
on nematode populations in soil and peanut yield. However, nematicide treatment did not affect
nematode populations in soil or peanut yield regardless of rotation sequence. These results
were unexpected based on other research demonstrating suppression of nematodes by
fluopyram. However, soil moisture was limited in these trials after planting in early May through
early June and may have affected ability of fluopyram to move into soil solution and protect
seedlings from infection by nematodes. Research will be conducted to compare these

treatments in cotton (2020) and peanut (2021) in these experiments.

Research Authors:
D.L. JORDAN*, B.B. SHEW, R.L. BRANDENBURG, and A. GORNY, North Carolina State University, Raleigh, NC 27695, and W. YE, North Carolina Department of Agriculture and Consumer Services, Raleigh, NC 27699.