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Pest & Disease Library

Dagger Nematodes: How to Identify, Treat & Control Them

Dagger nematodes (Xiphinema spp.) feed at root tips; X. index is especially important because it transmits Grapevine Fanleaf Virus (GFLV), so management addresses both feeding damage and virus spread.

Common crops affected

How to identify it

  • Root-tip stunting and reduced fine roots on grape
  • Where X. index and GFLV occur: mottling, deformed leaves, poor set
  • Damaging on grapes around 15–25+ per sample in mature vines

Recommended Vegalab solution: Nematode Control

Soil-directed Nematode Control to reduce dagger populations; where GFLV is present, combine with virus-tested stock and rogueing.

Results you can mention: tracked and declining across successive samplings under Nematode Control programs in grape trials.

RoleProductUse
Primary controlNematode ControlSoil-applied natural nematicide (drench, drip or in-furrow)
Root recoveryRoot BoostRebuild damaged roots
Soil biologyCharge BioboostSuppressive soil biology
Not sure this is what's affecting your crop? Ask an agronomist about your crop →

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Frequently asked questions

Why are dagger nematodes serious on grapes?

X. index transmits Grapevine Fanleaf Virus, so it damages roots and spreads a serious virus — lowering the vector limits spread.