Plant Disease Resistance Codes

An alphabetical list of disease code acronyms used on our website and in our catalog.

Note: HR = High Resistance IR = Intermediate Resistance

A | Anthracnose | Fungus

Colletotrichum lindemuthianum (Bean)
C. orbiculare (Cucurbitaceae, Watermelon)

AB | Alternaria Blight | Fungus | Alternaria dauci (Carrot) [See EB for Alternaria Blight of Tomato]
ALS | Angular Leaf Spot | Bacterium | Pseudomonas syringae pv. lachrymans (Cucumber)
AS | Alternaria Stem Canker | Fungus | Alternaria alternata f. sp. lycopersici (Tomato)
B | Bacterial Wilt | Bacterium | Erwinia tracheiphila (Cucumber)
BB | Bacterial Blight | Bacterium | Xanthomonas hortorum pv. carotae (Carrot)
BBS | Bacterial Brown Spot | Bacterium | Pseudomonas syringae pv. syringae (Bean)
BLS | Bacterial Leaf Spot | Xanthomonas campestris pv. vesicatoria (Pepper)
BMV | Bean Mosaic Virus (Bean)
BO | Botrytis Blight or Rot of Onion | Fungus | Botrytis allii (Onion)
BR | Black Rot | Bacterium | Xanthomonas campestris pv. campestris (Brassicaceae)
BRoot | Black Root | Fungus | Aphanomyces raphani (Radish)
BS | Black Speck | Fungus | Rhizoctonia ssp
C | Cercospora Blight | Fungus | Cercospora carotae (Carrot)
CMV | Cucumber Mosaic Virus (Cucurbitaceae)
CR | Club Root | Fungus | Plasmodiophora brassicae (Cabbage)
CRR | Corky Root Rot | Fungus | Pyrenochaeta lycopersici (Tomato)
CS | Cavity Spot | Water Mold | Pythium spp. (Carrot)
CTM | Curly Top Beet Mosaic Virus (Beet)
Cv | Cladosporium Leaf Spot | Fungus | Cladosporium variabile (Spinach)
CVYV | Cucumber Vein Yellowing Virus (Cucumber)
DM | Downy Mildew | Water Mold

Bremia lactucae (Lettuce)
Hyaloperonospora brassicae (Radish)
H. parasitica (Arugula)
H. brassicae (Broccoli, Cabbage, Chinese Cabbage)
Peronospora belbahrii (Basil)
P. destructor (Onion)
P. effusa (Spinach)
P. viciae (Pea)
Pseudoperonospora cubensis (Cucumber)

EB | Early Blight (Alternaria Blight) | Fungus | Alternaria solani (Tomato)
F | Fusarium Wilt | Fungus

Fusarium oxysporum f. sp. basilici (Basil)
F. oxyporum f. sp. lycopersici (Tomato)
F. oxysporum f. sp. melonis (Melon)
F. oxysporum f. sp. niveum (Watermelon)
F. oxysporum f. sp. pisi (Pea)

FBR | Fusarium Basal Rot | Fungus | Fusarium oxysporum f. sp. cepae (Onion)
FLB | Foliar Late Blight | Water Mold | Phytophthora infestans (Potato)
FOR | Fusarium Crown and Root Rot | Fungus | Fusarium oxysporum f. sp. radicis–lycopersici (Tomato)
FY | Fusarium Yellows | Fungus
- Fusarium oxysporum f. sp. conglutinans (Brassicaceae)
- F. oxysporum f. sp. raphani (Radish)
GLS | Gray Leaf Spot | Fungus | Stemphylium solani (Tomato)
HB | Halo Blight | Bacterium | Pseudomonas savastanoi pv. phaseolicola (Bean)
LB | Late Blight | Water Mold | Phytophthora infestans (Tomato)
LM | Leaf Mold | Fungus | Cladosporium fulvum aka Fulvia fulva (Tomato)
LMV | Lettuce Mosaic Virus (Lettuce)
MDMV | Maize Dwarf Mosaic Virus (Corn)
MT0-10 | Indicates seeds have been tested for Lettuce Mosaic Virus, and that none was found in a sample of 10,000 seeds or more.
MT0-30 | Indicates seeds have been tested for Lettuce Mosaic Virus, and that none was found in a sample of 30,000 seeds or more.
N | Roundworm | Nematode | Meloidogyne arenaria, M. incognita, M. javanica (Tomato)
NCLB | Northern Corn Leaf Blight | Fungus | Exserohilum turcicum (Corn)
Nr | Lettuce Leaf Aphid | Insect | Nasonovia ribisnigri (Lettuce)
Pb | Lettuce Root Aphid | Insect | Pemphigus bursarius (Lettuce)
PC | Phytophthora Blight | Water Mold | Phytophthora capsici (Pepper)
PEMV | Pea Enation Mosaic Virus (Pea)
PLR | Pea Leaf Roll Virus (Pea)
PM | Powdery Mildew | Fungus

Erisyphe heraclei or Leveillula taurica (Carrot)
Erisyphe pisi (Peas)
E. polygoni (Beans)
Oidium neolycopersici (Tomato)
Podosphaera xanthii (Cucurbitaceae, Watermelon)

PMV | Pepper Mottle Virus | Potyvirus (Pepper)
PR | Pink Root | Fungus | Phoma terrestris (Onion)
PRSV | Papaya Ringspot Virus (Curcubitaceae)
PU | Purple Blotch | Fungus | Alternaria porri (Leek)
PVY | Potato Virus Y (Pepper)
R | Common Rust | Fungus

Puccinia allii (Leek)
P. asparagi (Asparagus)
P. sorghi (Corn)
Uromyces appendiculatus (Bean)

Rs | Corky Root | Bacterium | Rhizomonas suberifaciens (Lettuce)
RZ | Rhizoctonia or Black Scurf | Fungus
- Rhizoctonia solani (Potato)
- Rhizoctonia solani (Radish)
S | Scab |
- Bacteria | Streptomyces scabies and other S. ssp. (Potato)
- Fungus | Cladosporium cucumerinum (Cucumber)
SCLB | Southern Corn Leaf Blight | Fungus | Bipolaris maydis (Corn)
SW | Stewart's Wilt | Bacterium | Pantoea stewartii (Corn)
TBSV | Tomato Bushy Stunt Virus (Lettuce Dieback Complex [Lettuce])
TEV | Tobacco Etch Virus (Pepper)
TLB | Tuber Late Blight | Phytophthora infestans (Potato)
TM | Tobamovirus (Pepper)
TMV | Tobacco Mosaic Virus (Solanaceae)
ToANV | Tomato Apex Necrosis Virus (Tomato)
ToMV | Tomato Mosaic Virus (Tomato, Pepper)
TSP | Target Spot | Fungus | Corynespora cassiicola (Cucumber)
TSWV | Tomato Spotted Wilt Virus (Tomato)
TYLCV | Tomato Yellow Leaf Curl Virus (Tomato)
V | Verticillium Wilt | Fungal | Verticillium albo–atrum and other V. spp. (Potato, Tomato)
WMV | Watermelon Mosaic Virus (Cucurbitaceae)
WR | White Rust | Water Mold

Albugo occidentalis (Spinach)
A spp. (Cabbage)

WT | White Tip | Phytophthora porri (Spinach)
ZYMV | Zucchini Yellow Mosaic Virus (Cucurbitaceae)

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