Nevada Plant Pathogen Rating Code

         Guidelines for enforcement actions under each rating code*

Rating Code
Pathogen Classification
Port of Entry Enforcement
In-state Occurrence
A
 Invasive and destructive pathogens Reject entry Emergent eradication or quarantine
B
 Known pathogens of economic importance Reject entry Control required in nurseries or field
C
 Common pathogens Treatment required before entry  Control required in nurseries or field
D
 Pathogens with less impact on Nevada Entry allowed Control at owner's decision
E
 Invasive pathogens pending for investigation Reject entry Emergent eradication or quarantine

                                       

    RATING     COMMON NAME      SCIENTIFIC NAME
         C  Angular Leaf Spot of Strawberry  Xanthomonas fragariae
         C   Bacterial Canker of stone fruits; Blast  Pseudomonas syringae
         B  Bacterial Canker of tomato  Corynebacterium michiganense
         C  Bacterial leaf spot of geranium  Xanthomonas geranii
         C  Bacterial leaf spot of maple  Pseudomonas aceris
         C   Bacterial leaf spot of orchids  Pseudomonas cattleyae
         C  Bacterial speck of tomato  Pseudomonas tomato
         C  Bacterial spot of stone fruits  Xanthomonas pruni
         C  Bacterial stripe of wheat and barley  Xanthomonas translucens
         C  Bacterial wilt of alfalfa  Corynebacterium insidiosum
         A  Citrus canker  Xanthomonas citri
         C  Crown gall  Agrobacterium tumefaciens
         C  Fire blight  Erwinia amylovora
         C  Hairy root  Agrobacterium rhizogenes
         A  Ring rot of potato  Corynebacterium sepedonicum
         C  Southern wilt; bacterial wilt  Pseudomonas solanacearum
         C  Anthracnose of ash  Gloeosporium aridum
         C  Anthracnose of elm  Gloeosporium inconspicuum
         C  Anthracnose of oak  Gloeosporium quercinum
         C  Apple scab  Venturia inaequalis--Perfect stage

 Pusicladium dendriticum --          Imperfect stage
         C  Armillaria root rot. Oak root fungus  Armillaria mellea
         C  Barley covered smut  Ustilago hordei
         E  Black spot of roses  Diplocarpon rosae
         A  Chestnut blight  Endothia parasi tica
         C  Common potato scab  Streptomyces scabies
         E  Common rhododendron rust  Chrysomyxa piperiana
         C  Corn smut  Ustilago maydis
         C  Cytospora canker of poplar/willow  Valsa sordida
         E  Damping-off  Pythium ultimum
         C  Damping-off  Rhizoctonia solani
         A  Downy mildew of corn  Sclerospora maydis
         C  Downy mildew of crucifers  Peronospora parasitica
         C  Downy mildew of cucurbits  Pseudoperonospora cubensis
         C  Downy mildew of grape  Plasmopara viticola
         E  Downy mildew of lettuce  Bremia lactucae
         C  Downy mildew of onion  Peronospora destructor
         A  Dutch elm disease  Ceratocystis ulmi
         C  Fairy rings in lawns  Marasmius oreades
         C  Leaf spots; blights; and fruit rots of various plants  Alternaria spp.
         C  Loose smut of barley/wheat  Ustilago nuda(Ustilago tritici)
         C  Loose smut of oat  Ustilago avenae
         C  Wilt disease  Many pathogens
         C  Onion smudge  Colletotrichum circinans
         A  Ozonium root rot  Phymatotrichum omnivorum
         A  Potato wart disease  Synchytrium endobioticum
         C  Powdery mildew of peach / rose  Sphaerotheca pannosa
         C  Powdery mildew on euonymua  Oidium euonymi-japonici
         C  Powdery mildew on lilac  Microsphaera alni
         C  Stem rust of cereals(11;111) and barberry(0;1)  Puccinia graminis
         C  Sycamore anthracnose  Gnomonia platani - perfect stage (Gnomonia veneta)
         C  Verticillium wilt; various host  Verticillium albo-atrum
         C  Verticillium wilt; various host  Verticillium dahliae
         B  White rot of onion/garlic  Sclerotium cepivorum
         

 

     RATING          COMMON NAME       SCIENTIFIC NAME
          D  American dagger nematode  Xiphinema americanum
          D  Awl nematode  Dolichodorus spp.(except Dolichodorus heterocephalus)
          A  Barley root-knot nematode  Meloidogyne naasi
          C  Bent grass nematode  Anguina agrostis
          B  A bulb and stem nematode  Ditylenchus intermedius
          A  Burrowing nematode  Radopholus similis
          C  Cabbage cyst nematode  Heterodera cruciferae
          C  Cactus cyst nematode  Heterodera cacti
          A  California dagger nematode  Xiphinema index
          E  Chamber' s dagger nematode  Xiphinema chambersi
          A  Christie' s stubby-root nematode  Paratrichodorus christiei
          C  Chrysanthemum foliar nematode  Aphelenchoides ritzemabosi
          C  Citrus nematode  Tylenchulus semipenetrans
          C  Clover cyst nematode  Heterodera trifolii
          C  Cobb's lesion nematode  Pratylenchus penetrans
          C  Corn lesion nematode  Pratylenchus zeae
          A  Golden nematode  Globodera zostochiensis
          A  Oat cyst nematode  Heterodera avenae
          B  Potato  rot nematode  Ditylenchus destructor
          A  Reniform nematode  Rotylenchulus reniformis
          D  Rice root nematode  Hirschmanniella oryzae
          D  Rice root nematode  Hirschmanniella belli
          D  Rice root nematode  Hirschmanniella caudacrena
          D  Rice root nematode  Hirschmanniella gracilis
          E  Ring nematode  Criconemoides spp.
          C  Root-knot nematode  Meloidogyne spp.(except Meloidogyne naasi)
          A  Soybean cyst nematode  Heterodera glycines
          B  Stem and bulb nematode  Ditylenchus dipsaci
          A  Sting nematode  Belonolaimus spp.
          C  Strawberry spring dwarf nematode  Apheloschoides fragariae
          C  Strawberry summer dwarf nematode  Apheloschoides besseyi
          A  Stubby-root nematode  Trichodorus spp.
          C  Sugar beet cyst nematode  Heterodera schachtii
          A  Sugar beet false root-knot nematode  Nacobbus aberrans
          C  Wheat nematode  Anguina tritici

 

       RATING              COMMON NAME         SCIENTIFIC NAME
         C  Alfalfa mosaic virus  AMV
         E  Apple stem pitting virus  ASPV
         B  Elm phloem necrosis disease  MLO
         A  Grape fan leaf virus  Fanleaf Enation; Veinbanding; Yellow mosaic
         C  Grape Pierce' s disease  Xylella fastidiosa
         C  Ollalie dwarf disease  Cause unknown
         A  Plum pox virus  Sharka
         C  Squash mosaic virus  
         C  Tobacco mosaic virus  Tomato mosaic; Shoestring( in cool climate)
         A  Tobacco rattle virus  Potato stem mottle
         C  Tomato ring spot virus  
         C  Watermelon mosaic virus  WMV Strains 1 and 2
 

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