California Department of Food and Agriculture - Pest Rating System            

              Rev 08/03/21

Pest Rating System: General Principles  
Action Oriented Pest Rating System
Pest Ratings for Nematodes in California (with links to Nemaplex pest information pages  
                Nematodes in alphabetical order of Genus and species   
                Nematodes in order of pest ratings 

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                Previoous version of the pest rating list  Go to Nemaplex Main Menu

 

 

 

I   GENERAL PRINCIPLES

Guidelines for Interpreting, Establishing or Changing Pest Ratings

 

Plant Health and Pest Prevention Services

California Department of Food and Agriculture

 

The California Food and Agricultural Code mandates that, the California Department of Food and Agriculture (CDFA) shall prevent the introduction and spread of injurious insect or animal pests, plant diseases, and noxious weeds.  This statutory duty requires a pest policy which recognizes that organisms vary in their potential and actual harm to the agriculture and environment of California.  Overall pest significance is based on the probability of spread of the pest, the potential economic damage, the presence of host species, the favorability of the climate and other factors. Pest ratings are based on that evaluation and provide the basis for determining what pest prevention activities are appropriate, at what level, and when and where those activities should be conducted.

           

(i)                Pest ratings are intended as aids to inform County Agricultural Commissioners and other interested persons as to a particular pest’s environmental, agricultural and biological significance, as well as its importance to the general public, and the action recommended by the California Department of Food and Agriculture (CDFA) to deal with the pest.

 

(ii)               Each pest rating represents the view of CDFA of the statewide importance of the pest to the agricultural, horticultural, forestry, and public health interests of California.  Local conditions may dictate more stringent action against the same pest in individual counties at the discretion of the County Agricultural Commissioner.

 

(iii)               It is the policy of CDFA to use an Action-Oriented Rating System.�  Pest ratings represent the policy of CDFA in relation to actions to be taken, consistent with existing statutes, which include authority for: the promulgation of quarantine, eradication, control, standards of cleanliness, and other regulations; holding and inspection; establishing host-free, weed-free, and special pest control districts; and for other regulatory activities.

 

II  ACTION-ORIENTED RATING SYSTEM

 

DEFINITIONS

 

A    An organism of known economic importance subject to action enforced by the state (or County Agricultural Commissioner acting as a state agent) involving:  eradication, quarantine regulation, containment, rejection, or other holding action.

 

Q     An organism or disorder requiring a temporary A� action pending determination of a permanent rating.  The organism is suspected to be of economic importance but its status is uncertain because of incomplete identification or inadequate information.  In the case of an established infestation, at the discretion of the Director, CDFA may conduct surveys and may convene the Division Pest Study Team to determine a permanent rating.

 

B      An organism of known economic importance that is of limited distribution in the State of California and is subject to:  eradication, containment, control or other holding action at the discretion of the individual County Agricultural Commissioner. Or, an organism of known economic importance subject to state endorsed holding action and eradication only when found in a nursery.

 

C     An organism already of common occurrence in the state that is subject to no state-enforced action outside of nurseries except to retard spread.  At the discretion of the County Agricultural Commissioner. Or, an organism subject to no state enforced action except to provide for pest cleanliness in nurseries.

 

D      No Action - plant parasites or other organisms of little or no economic importance, or organisms considered beneficial..

 

Newly detected pest species are subjected to a formal rating process that allows input from stakeholders and requires regular review of their status in the State.  Greater detail on the pest rating system and the mitigating actions triggered by detection of a pest in each of the ratings is available at:

https://www.cdfa.ca.gov/plant/pestratings/docs/3162-ApprovedText-final.pdf

 

Details of the Pest Rating System in California are provided at:

https://www.cdfa.ca.gov/plant/regs_pestrating.html

 

 

 

 III  PEST RATINGS FOR NEMATODES IN CALIFORNIA

Pest Ratings are under frequent review and subjact to change as new information becomes available and new pests are detected.  The most current list for nematodes is available at:

http://blogs.cdfa.ca.gov/Section3162/?p=1955

As of July, 2021, nematode pest ratings for the State of California are listed below with links to greater information on the biology and management of the pest.

Nematode Pest Rating List - July 2021

(Alphabetically by genus and species)

Genus/species

Common Name

Rating

Anguina funesta

Seed Gall Nematode

A

Anguina tritici

Wheat Seed-gall Nematode

A

Aphelenchoides besseyi

Strawberry Summer Dwarf Nematode

Rice White tip Nematode

A

Aphelenchoides ritzemabosi

 Crysanthemum Foliar Nematode

C

Asian Citrus Root-knot Nematodes

Meloidogyne citri

M. donghaiensis

M. fujianensis

M. indica

M. jianyangensis

M. kongi

M. mingnanica

Asian Citrus Root-knot Nematodes Complex

A

Belonolaimus longicaudatus

Sting Nematode

A

Bursaphelenchus cocophilus

Red Ring Nematode

A

Criconemoides  spp.

Mesocriconema spp.

Ring Nematodes

C

Ditylenchus destructor

Potato Rot Nematode

A

Ditylenchus dipsaci

Stem and Bulb Nematode

C

Globodera pallida

Pale or White Cyst Nematode

A

Globodera rostochiensis

Golden Nematode

A

Helicotylenchus multicinctus

Spiral Nematode

B

Helicotylenchus  spp.

Spiral Nematodes

C

Hemicycliophora arenaria

Sheath Nematode

B

Heterodera australis

Australian Cereal Cyst Nematode

A

Heterodera avenae

European Cereal Cyst Nematode

A

Heterodera carotae

Carrot Cyst Nematode

B

Heterodera filipjevi

Filipjev Cereal Cyst Nematode

A

Heterodera glycines

Soybean Cyst Nematode

A

Heterodera sturhani

Sturhan Cereal Cyst Nematode

A

Heterodera ustinovi

Ustinov Grass Cyst Nematode

A

Hirschmanniella belli

 

C

Hirschmanniella diversa

 

C

Longidorus elongatus

Needle Nematode

B

Meloidogyne chitwoodi

Columbia Root-knot Nematode

B

Meloidogyne enterolobii

Root-knot Nematode

A

Meloidogyne floridensis

Root-knot Nematode

A

Melodogyne hapla

Northern Root-knot Nematode

C

Meloidogyne haplanaria

Texas Peanut Root-knot Nematode

Q

Meloidogyne incognita

Southern Root-knot Nematode

C

Meloidogyne marylandi

Root-knot Nematode

C

Merlinius spp.

Stunt Nematodes

C

Mesocriconema xenoplax

Ring Nematode

C

Paratrichodorus minor

Stubby Root Nematode

C

Paratrichodorus porosus

Stubby Root Nematode

C

Paratrichodorus spp.

Stubby Root Nematode

C

Paratylenchus  spp.

Pin Nematode

C

Pratylenchus alleni

Allens Root Lesion Nematode

A

Pratylenchus coffeae

Root Lesion Nematode

B

Pratylenchus hippeastri

Amaryllis Lesion Nematode

B

Pratylenchus neglectus

Root Lesion Nematode

C

Pratylenchus thornei

Root Lesion Nematode

C

Punctodera punctata

Cyst Nematode

C

Quinisulcius spp.

Stunt Nematodes

C

Radopholus similis

Burrowing Nematode

A

Rotylenchulus reniformis

Reniform Nematode

A

Scutellonema spp.

Spiral Nematode

C

Tylenchorhynchus spp.

Stunt Nematodes

C

Xiphinema americanum

American Dagger Nematode

C

Xiphinema diversicaudatum

European Dagger Nematode

A

Xiphinema index

California Dagger Nematode

B

 

 

 


Nematode Pest Rating List, July 2021

(sorted by rating)

Genus/species

Common Name

Rating

Anguina funesta

Seed Gall Nematode

A

Anguina tritici

Wheat Seed-gall Nematode

A

Aphelenchoides besseyi

Strawberry Summer Dwarf Nematode

Rice White tip Nematode

A

Asian Citrus Root-knot Nematodes

Meloidogyne citri

M. donghaiensis

M. fujianensis

M. indica

M. jianyangensis

M. kongi

M. mingnanica

Asian Citrus Root-knot Nematodes Complex

A

Belonolaimus longicaudatus

Sting Nematode

A

Bursaphelenchus cocophilus

Red Ring Nematode

A

Ditylenchus destructor

Potato Rot Nematode

A

Globodera pallida

Pale or White Cyst Nematode

A

Globodera rostochiensis

Golden Nematode

A

Heterodera australis

Australian Cereal Cyst Nematode

A

Heterodera avenae

European Cereal Cyst Nematode

A

Heterodera filipjevi

Filipjev Cereal Cyst Nematode

A

Heterodera glycines

Soybean Cyst Nematode

A

Heterodera sturhani

Sturhan Cereal Cyst Nematode

A

Heterodera ustinovi

Ustinov Grass Cyst Nematode

A

Meloidogyne enterolobii

Root-knot Nematode

A

Meloidogyne floridensis

Root-knot Nematode

A

Pratylenchus alleni

Allens Root Lesion Nematode

A

Radopholus similis

Burrowing Nematode

A

Rotylenchulus reniformis

Reniform Nematode

A

Xiphinema diversicaudatum

European Dagger Nematode

A

Helicotylenchus multicinctus

Spiral Nematode

B

Hemicycliophora arenaria

Sheath Nematode

B

Heterodera carotae

Carrot Cyst Nematode

B

Longidorus elongatus

Needle Nematode

B

Meloidogyne chitwoodi

Columbia Root-knot Nematode

B

Pratylenchus coffeae

Root Lesion Nematode

B

Pratylenchus hippeastri

Amaryllis Lesion Nematode

B

Xiphinema index

California Dagger Nematode

B

Aphelenchoides ritzemabosi

 Crysanthemum Foliar Nematode

C

Criconemoides  spp.

Mesocriconema spp.

Ring Nematodes

C

Ditylenchus dipsaci

Stem and Bulb Nematode

C

Helicotylenchus  spp.

Spiral Nematodes

C

Hirschmanniella belli

 

C

Hirschmanniella diversa

 

C

Melodogyne hapla

Northern Root-knot Nematode

C

Meloidogyne incognita

Southern Root-knot Nematode

C

Meloidogyne marylandi

Root-knot Nematode

C

Merlinius spp.

Stunt Nematodes

C

Mesocriconema xenoplax

Ring Nematode

C

Paratrichodorus minor

Stubby Root Nematode

C

Paratrichodorus porosus

Stubby Root Nematode

C

Paratrichodorus spp.

Stubby Root Nematode

C

Paratylenchus  spp.

Pin Nematode

C

Pratylenchus neglectus

Root Lesion Nematode

C

Pratylenchus thornei

Root Lesion Nematode

C

Punctodera punctata

Cyst Nematode

C

Quinisulcius spp.

Stunt Nematodes

C

Scutellonema spp.

Spiral Nematode

C

Tylenchorhynchus spp.

Stunt Nematodes

C

Xiphinema americanum

American Dagger Nematode

C

Meloidogyne haplanaria

Texas Peanut Root-knot Nematode

Q


Nematode Pest Rating List, Previous version

(sorted by rating)

Genus/species

Common Name

Rating

Aphelenchoides besseyi

strawberry summer dwarf nematode

A

Belonolaimus  spp.

sting nematode

A

Belonolaimus longicaudatus

sting nematode

A

Dolichodorus heterocephalus

Cobb's awl nematode

A

Globodera pallida

white cyst potato nematode

A

Globodera rostochiensis

golden nematode

A

Hemicycliophora arenaria

sheath nematode

A

Heterodera avenae

oat cyst nematode

A

Heterodera glycines

soybean cyst nematode

A

Hirschmanniella oryzae

rice root nematode

A

Nacobbus aberrans

sugarbeet false root-knot nematode

A

Radopholus similis

burrowing nematode

A

Rotylenchulus reniformis

reniform nematode

A

Xiphinema diversicaudatum

European dagger nematode

A

 

 

 

Ditylenchus destructor

potato rot nematode

B

Meloidogyne chitwoodi

Columbia root-knot nematode

B

Meloidogyne naasi

barley root-knot nematode

B

Xiphinema index

California dagger nematode

B

 

 

 

Anguina agrostis

bent grass nematode

C

Anguina tritici

wheat nematode

C

Aphelenchoides fragariae

strawberry spring dwarf nematode

C

Aphelenchoides ritzemabosi

chrysanthemum foliar nematode

C

Bursaphelenchus xylophilus

pine wood nematode

C

Ditylenchus dipsaci

stem and bulb nematode

C

Heterodera cruciferae

cabbage cyst nematode

C

Heterodera schachtii

sugarbeet cyst nematode

C

Longidorus africanus

no common name known

C

Meloidogyne graminis

root-knot nematode

C

Meloidogyne spp.

root-knot nematode

C

Paralongidorus microlaimus

needle nematode

C

Pratylenchus brachyurus

smooth-headed lesion nematode

C

Pratylenchus coffeae

coffee lesion nematode

C

Pratylenchus penetrans

Cobb's lesion nematode

C

Pratylenchus vulnus

walnut lesion nematode

C

Pratylenchus zeae

corn lesion nematode

C

Rotylenchulus parvus

no common name known

C

Tylenchulus semipenetrans

citrus nematode

C

Xiphinema americanum

American dagger nematode

C

Xiphinema bakeri

dagger nematode

C

Xiphinema brevicolle

dagger nematode

C

Xiphinema coxi

dagger nematode

C

Xiphinema insigne

dagger nematode

C

Xiphinema vuittenezi

dagger nematode

C

 

 

 

Anguina amsinckiae

seed gall nematode

D

Anguina balsamophila

seed gall nematode

D

Aphelenchoides composticola

a fungus-feeding nematode

D

Atalodera lonicerae

no common name known

D

Atalodera ucri

no common name known

D

Bakernema variabile

spine nematode

D

Cacopaurus spp.

sessile nematode

D

Cactodera cacti

cactus cyst nematode

D

Criconema sp.

spine nematode

D

Criconemella axeste

ring nematode

D

Criconemella curvata

ring nematode

D

Criconemella macrodora

ring nematode

D

Criconemella parva

ring nematode

D

Mesocriconema xenoplax

ring nematode

D

Criconemoides  spp.

ring nematode

D

Crossonema fimbriatum

spine nematode

D

Ditylenchus intermedius

a bulb and stem nematode

D

Dolichodorus spp.

awl nematode

D

Gracilacus spp.

pin nematode

D

Helicotylenchus  spp.

spiral nematode

D

Helicotylenchus spicaudatus

spiral nematode

D

Hemicriconemoides  spp.

sheathoid nematode

D

Hemicycliophora megalodiscus

sheath nematode

D

Hemicycliophora spp.

sheath nematode

D

Heterodera fici

fig cyst nematode

D

Heterodera trifolii

clover cyst nematode

D

Hirschmanniella belli

rice root nematode

D

Hirschmanniella caudacrena

rice root nematode

D

Hirschmanniella gracilis

rice root nematode

D

Hoplolaimus spp.

lance nematode

D

Longidorus spp.

needle nematode

D

Merlinius brevidens

stunt nematode

D

Merlinius conicus

stunt nematode

D

Merlinius grandis

stunt nematode

D

Merlinius superbus

stunt nematode

D

Nacobbus dorsalis

false root-knot nematode

D

Pararotylenchus  sp.

spiral nematode

D

Paratrichodorus allius

stubby- root nematode

D

Paratrichodorus minor

Christie's stubby- root nematode

D

Paratrichodorus porosus

stubby- root nematode

D

Paratrichodorus renifer

stubby- root nematode

D

Paratylenchus  spp.

pin nematode

D

Pratylenchus convallariae

lesion nematode

D

Pratylenchus crenatus

lesion nematode

D

Pratylenchus goodeyi

lesion nematode

D

Pratylenchus hexincisus

lesion nematode

D

Pratylenchus minyus

lesion nematode

D

Pratylenchus neglectus

lesion nematode

D

Pratylenchus pratensis

lesion nematode

D

Pratylenchus scribneri

lesion nematode

D

Pratylenchus thornei

lesion nematode

D

Quinisulcius acutus

stunt nematode

D

Quinisulcius capitatus

stunt nematode

D

Rotylenchus  spp.

spiral nematode

D

Sarisodera hydrophylla

no common name known

D

Scutellonema spp.

spiral nematode

D

Trichodorus spp.

stubby-root nematode

D

Tylenchorhynchus spp.

stunt nematode

D

 

 

 

Bursaphelenchus mucronatus

pine wood nematode

Q

Heterodera mani

grass cyst nematode

Q

Pratylenchus alleni

lesion nematode

Q

Pratylenchus flakkensis

lesion nematode

Q

Xiphinema brasiliense

dagger nematode

Q

Xiphinema chambersi

Chamber's dagger nematode

Q

Xiphinema setariae

dagger nematode

Q

Xiphinema vulgare

dagger nematode

Q

 

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