Clarissa Balbalian (Chair, National Data Committee)
The Communicator: Volume 6, Issue 7, July 2025
The following lists document additions, modifications and deletions to the National Data Repository (NDR) Host and Pest dictionaries that were implemented in June. You can view updates to the NPDN host and pest dictionaries any time by logging into NDR clicking on the Dictionaries tab and selecting Updates from the dropdown menu.
A guideline to understanding data dictionaries in the NDR is available to NPDN members online. NPDN members also have access to an online guideline on how to request new host/pest codes or changes to existing codes. Members must be logged in to access the NDR and the guidelines.
Entries below are listed alphabetically by common name followed by the scientific name appearing in parentheses.
Host Dictionary Updates
New Host Additions
None
Modified Hosts
None
Deleted Hosts*
None
Pest Dictionary Updates
New Pest Codes
None
Modified Pest Codes
Pythium blight; Root rot (Pythium spinosum)
Water rot; Potato leak (Pythium sp./spp.)
Pythium fruit rot; Cottony leak (Pythium sp./spp.)
Potato leak (Pythium debaryanum)
Pythium leak (Pythium ultimum)
Rootlet rot (Pythium ultimum)
Pythium damping off (Pythium sp./spp.)
Pythium damping-off; Root rot (Pythium irregulare)
Pythium damping off (Pythium vanterpoolii)
Pythium damping off (Pythium polymastum)
Seed rot; Damping off; Seedling blight (Pythium sp./spp.)
Pythium seed rot and damping off (Pythium rostratum)
Cavity spot (Pythium sp./spp.)
Flame chlorosis (Pythium sp. transmitted virus-like agent)
Mefenoxam resistant Pythium (Pythium sp./spp.)
Unspecified pathology (Pythium sp./spp.)
Root rot (Elongisporangium undulatum)
Pythium Root Rot (Globisporangium cylindrosporum)
Unspecified pathology (Globisporangium cryptoirregulare)
Cacao mealy pod; Pod rot (Trachysphaera fructigena)
Downy mildew (Order Peronosporales)
Downy mildew (Peronospora hariotii)
Downy mildew (Peronospora sp./spp.)
Poppy downy mildew (Peronospora arborescens)
Onion downy mildew (Peronospora destructor)
Buckwheat downy mildew (Peronospora ducometii)
Soybean downy mildew (Peronospora manshurica)
Beet downy mildew (Peronospora farinosa f.sp. betae)
Alfalfa downy mildew (Peronospora trifoliorum)
Pea downy mildew (Peronospora viciae)
Rose downy mildew (Peronospora sparsa)
Downy mildew (Peronospora potentillae)
Downy mildew (Peronospora pulveracea)
Foxglove downy mildew (Peronospora digitalis)
Downy mildew (Peronospora grisea)
Snapdragon downy mildew (Peronospora antirrhini)
Downy mildew (Peronospora phlogina)
Downy mildew (Peronospora radii)
Downy mildew (Peronospora pocutica)
Henbit downy mildew (Peronospora lamii)
Downy mildew (Peronospora calotheca)
Downy mildew (Peronospora lophanthi)
Downy mildew (Peronospora belbahrii)
Downy mildew (Peronospora mesembryanthem)
Basil downy mildew (Peronospora belbahrii)
Downy mildew (Peronospora effusa)
Bramble downy mildew (Peronospora sparsa)
Blue mold (Peronospora hyoscyami f.sp. tabacina)
Downy mildew (Hyaloperenospora sp./spp.)
Downy mildew (Hyaloperonospora parasitica)
Downy mildew (Plasmopara megasperma)
Downy mildew (Plasmopara sp./spp.)
Downy mildew (Plasmopara halstedii)
Downy mildew (Plasmopara nivea)
Grape downy mildew (Plasmopara viticola)
Viburnum downy mildew (Plasmopara viburni)
Downy mildew (Plasmopara geranii)
Downy mildew (Plasmopara obducens)
Redbud downy mildew (Plasmopara cercidis)
Yellow tuft (Sclerophthora macrospora)
Brown stripe downy mildew (Sclerophthora rayssiae var. zeae)
Crazy top downy mildew (Sclerophthora macrospora)
Aster downy mildew (Basidiophora entospora)
Downy mildew (Pseudoperonospora sp./spp.)
Cucurbit downy mildew (Pseudoperonospora cubensis)
Hop downy mildew (Pseudoperonospora humuli)
Downy mildew (Pseudoperonospora celtidis)
Hemp downy mildew (Pseudoperonospora cannabina)
Java downy mildew (Peronosclerospora maydis)
Downy mildew (Peronosclerospora noblei)
Philippine downy mildew (Peronosclerospora philippinensis)
Sugarcane downy mildew (Peronosclerospora sacchari)
Sorghum downy mildew (Peronosclerospora sorghi)
Downy mildew (Peronosclerospora spontanea)
Downy mildew (Peronosclerospora heteropogonis)
Downy mildew (Peronosclerosporas p./spp.)
Graminicola downy mildew (Sclerospora graminicola)
Downy mildew (Unidentified Fungus)
Downy mildew (Lettuce) (Bremia lactucae)
White rust (Albugo sp./spp.)
Crucifer white rust (Albugo candida)
White rust (Albugo ipomoeae-panduratae)
White rust (Albugo occidentalis)
White rust (Albugo bliti)
Sunflower white rust (Pustula tragopogonis)
White blister rust (Pustula centaurii)
White rust (Wilsoniana portulacae)
Seed rot/ water mold (Achlya conspicua)
Seed rot/water mold (Achlya klebsiana)
Black root (Aphanomyces raphanin)
Root rot (Aphanomyces sp./spp.)
Root rot (Aphanomyces cochlioides)
Aphanomyces root rot (Aphanomyces euteiches)
Aphanomyces seedling blight (Aphanomyces euteiches race 1)
Aphanomyces seedling blight (Aphanomyces euteiches race 2
Leaf spot (Aphanomyces raphani)
Pythiaceous root rot (Family Pythiaceae)
Rusty millipede (Trigoniulus corallinus)
Deleted Pest Codes*
None
*The NPDN does not delete any data. Deletion means that as of the date of the change, that host or pest code is no longer viable and the choice has been eliminated from the NDR host and/or pest dictionary.
