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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Female root knot nematode next to root gall.

Kiwifruit

Nematodes

Scientific Name:
Root knot nematode: Meloidogyne spp.

(Reviewed 3/07, updated 2/09)

In this Guideline:

DESCRIPTION OF THE PEST

Nematodes are microscopic, true roundworms. Root galling is associated with root knot nematodes only.

DAMAGE

Root knot nematodes may be damaging to the root system if relatively high soil populations are present. Vines become slightly weaker, especially in sandy areas, and fruit size on infected vines is reduced.

MANAGEMENT

Cultural Control
Irrigate with greater frequency to avoid plant stress. Remove broadleaf weeds and do not plant cover crops susceptible to root knot nematode where root knot nematode is present.

Treatment Decisions
The best time to treat for nematodes is before planting.

Common name Amount/Acre R.E.I.+ P.H.I.+
(trade name)   (hours) (days)
When choosing a pesticide, consider information relating to the environmental impact. Not all registered pesticides are listed. Always read label of product being used.
 
PREPLANT
A. DICHLOROPROPENE*
  (Telone II) See comments 5 days NA
  COMMENTS: The application rate for Telone II cannot exceed 35 gal/acre. In dry soils with slight surface moisture, the overall value of a Telone II treatment is equivalent to that of methyl bromide. Fumigants such as 1,3-dichloropropene are a source of volatile organic compounds (VOCs) but are minimally reactive with other air contaminants that form ozone. Fumigate only as a last resort when other management strategies have not been successful or are not available, become familiar with procedures that minimize off-gassing of fumigants.
 
B. METAM SODIUM*
  (Vapam HL) 75 gal 48 NA
  COMMENTS: Metam sodium* (Vapam HL), applied at a rate of 75 gal/acre delivered uniformly in 6 inches water/acre, can be as effective as Telone II or methyl bromide if: there are no old root systems present containing viable root knot nematode; the orifices of the irrigation delivery system are large enough to avoid misting and thereby volatilization of the product; and the soil and irrigation system can infiltrate 6 acre inches water in 8 hrs or less. For this latter requirement, sandy soils without a hardpan are usually suitable, whereas fine sandy loam soils may not be. Fumigants such as metam sodium are a source of volatile organic compounds (VOCs) but are minimally reactive with other air contaminants that form ozone. Fumigate only as a last resort when other management strategies have not been successful or are not available, become familiar with procedures that minimize off-gassing of fumigants.
 
POSTPLANT
A. FENAMIPHOS*
  (Nemacur 3) See comments 48 31
  COMMENTS: Currently the only available postplant nematicide. Applied as a liquid by metering into dripper or mister systems. If treating the entire field surface with a mister, the treatment rate is about 0.5–1 gal/acre/treatment (1 gal = 3 lb a.i.). Retreatments are necessary on a 30-day schedule. Do not treat in July or August when heaviest irrigation patterns will dilute the use of the chemical. Do not treat unless soil temperature exceeds 58°F. See label for specific treatment requirements. Use will be banned after 2007, and there is no current replacement.
 
+ Restricted entry interval (R.E.I.) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
* Permit required from county agricultural commissioner for purchase or use.
NA Not applicable.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Kiwifruit
UC ANR Publication 3449
Nematodes
M. V. McKenry, Kearney Agricutural Center, Parlier

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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