CDFA Nematode Ratings

California Department of Food and Agriculture - Nematode Ratings

Rev 10/05/10

Guidelines for Interpreting, Establishing or Changing

Nematode Pest Ratings

Plant Health and Pest Prevention Services

California Department of Food and Agriculture

Section 403 of the California Food and Agricultural Code mandates that, “The department 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 California’s agriculture and environment. Overall pest significance is 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 subject to: eradication, containment, control or other holding action at the discretion of the individual County Agricultural Commissioner.

An organism of known economic importance subject to state endorsed holding action and eradication only when found in a nursery.

“C” An organism subject to no state-enforced action outside of nurseries except to retard spread. At the discretion of the County Agricultural Commissioner.

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.

Nematode Pest Rating List

(Alphabetically by genus and species)

Genus/species	Common Name	Rating
Anguina agrostis	bent grass nematode	C
Anguina amsinckiae	seed gall nematode	D
Anguina balsamophila	seed gall nematode	D
Anguina tritici	wheat nematode	C

Aphelenchoides besseyi	strawberry summer dwarf nematode	A
Aphelenchoides composticola	a fungus-feeding nematode	D
Aphelenchoides fragariae	strawberry spring dwarf nematode	C
Aphelenchoides ritzemabosi	chrysanthemum foliar nematode	C

Atalodera lonicerae	no common name known	D
Atalodera ucri	no common name known	D

Bakernema variabile	spine nematode	D

Belonolaimus longicaudatus	sting nematode	A
Belonolaimus spp.	sting nematode	A

Bursaphelenchus mucronatus	pine wood nematode	Q
Bursaphelenchus xylophilus	pine wood nematode	C

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
Criconemella xenoplax	ring nematode	D

Criconemoides spp.	ring nematode	D

Crossonema fimbriatum	spine nematode	D

Ditylenchus destructor	potato rot nematode	B
Ditylenchus dipsaci	stem and bulb nematode	C
Ditylenchus intermedius	a bulb and stem nematode	D

Dolichodorus heterocephalus	Cobb's awl nematode	A
Dolichodorus spp.	awl nematode	D

Globodera pallida	white cyst potato nematode	A
Globodera rostochiensis	golden nematode	A

Gracilacus spp.	pin nematode	D

Helicotylenchus spicaudatus	spiral nematode	D
Helicotylenchus spp.	spiral nematode	D

Hemicriconemoides spp.	sheathoid nematode	D

Hemicycliophora arenaria	sheath nematode	A
Hemicycliophora megalodiscus	sheath nematode	D
Hemicycliophora spp.	sheath nematode	D

Heterodera avenae	oat cyst nematode	A
Heterodera cruciferae	cabbage cyst nematode	C
Heterodera fici	fig cyst nematode	D
Heterodera glycines	soybean cyst nematode	A
Heterodera mani	grass cyst nematode	Q
Heterodera schachtii	sugarbeet cyst nematode	C
Heterodera trifolii	clover cyst nematode	D

Hirschmanniella belli	rice root nematode	D
Hirschmanniella caudacrena	rice root nematode	D
Hirschmanniella gracilis	rice root nematode	D
Hirschmanniella oryzae	rice root nematode	A

Hoplolaimus spp.	lance nematode	D

Longidorus africanus	no common name known	C
Longidorus spp.	needle nematode	D

Meloidogyne chitwoodi	Columbia root-knot nematode	B
Meloidogyne graminis	root-knot nematode	C
Meloidogyne naasi	barley root-knot nematode	B
Meloidogyne spp.	root-knot nematode	C

Merlinius brevidens	stunt nematode	D
Merlinius conicus	stunt nematode	D
Merlinius grandis	stunt nematode	D
Merlinius superbus	stunt nematode	D

Nacobbus aberrans	sugarbeet false root-knot nematode	A
Nacobbus dorsalis	false root-knot nematode	D

Paralongidorus microlaimus	needle nematode	C

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 alleni	lesion nematode	Q
Pratylenchus brachyurus	smooth-headed lesion nematode	C
Pratylenchus coffeae	coffee lesion nematode	C
Pratylenchus convallariae	lesion nematode	D
Pratylenchus crenatus	lesion nematode	D
Pratylenchus flakkensis	lesion nematode	Q
Pratylenchus goodeyi	lesion nematode	D
Pratylenchus hexincisus	lesion nematode	D
Pratylenchus minyus	lesion nematode	D
Pratylenchus neglectus	lesion nematode	D
Pratylenchus penetrans	Cobb's lesion nematode	C
Pratylenchus pratensis	lesion nematode	D
Pratylenchus scribneri	lesion nematode	D
Pratylenchus thornei	lesion nematode	D
Pratylenchus vulnus	walnut lesion nematode	C
Pratylenchus zeae	corn lesion nematode	C

Quinisulcius acutus	stunt nematode	D
Quinisulcius capitatus	stunt nematode	D

Radopholus similis	burrowing nematode	A

Rotylenchulus parvus	no common name known	C
Rotylenchulus reniformis	reniform nematode	A

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

Tylenchulus semipenetrans	citrus nematode	C

Xiphinema americanum	American dagger nematode	C
Xiphinema bakeri	dagger nematode	C
Xiphinema brasiliense	dagger nematode	Q
Xiphinema brevicolle	dagger nematode	C
Xiphinema chambersi	Chamber's dagger nematode	Q
Xiphinema coxi	dagger nematode	C
Xiphinema diversicaudatum	European dagger nematode	A
Xiphinema index	California dagger nematode	B
Xiphinema insigne	dagger nematode	C
Xiphinema setariae	dagger nematode	Q
Xiphinema vuittenezi	dagger nematode	C
Xiphinema vulgarae	dagger nematode	Q

Nematode Pest Rating List

(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
Criconemella 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 vulgarae	dagger nematode	Q

California Department of Food and Agriculture - Nematode Ratings

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