Disease resistance codes are used throughout our catalog and website to quickly identify the resistances and tolerances bred into each variety. This legend provides a clear explanation of the abbreviations used, helping you better understand how each variety performs against common vegetable crop diseases. Use this guide as a reference when comparing products and selecting the right seed for your growing conditions.
HR = High Resistance IR = Intermediate Resistance
Beans | Beets | Broccoli | Brussels Sprouts | Cabbage | Carrots | Celery | Corn | Cucumbers
Eggplants | Herbs | Leeks | Lettuce | Melons | Onions | Peas | Peppers | Pumpkins | Radish
Spinach | Swiss Chard | Squash | Tomatoes | Turnips | Watermelons
Beans
| Disease Code |
Common Name |
Scientific Name |
| BCTV |
Beet Curly Top Virus |
Beet curly top virus |
| Cl |
Anthracnose |
Colletotrichum lindemuthianum |
| CMV |
Cucumber Mosaic Virus |
Cucumber mosaic virus |
| Heat |
Heat |
Heat |
| Psp |
Halo Blight |
Pseudomonas savastanoi pv. phaseolicola |
| Pss |
Bacterial Brown Spot |
Pseudomonas syringae pv. syringae |
| Ua |
Rust |
Uromyces appendiculatus |
| Xap |
Common Blight |
Xanthomonas axonopodis pv. phaseoli |
Beets
| Disease Code |
Common Name |
Scientific Name |
| BNYVV |
Rhizomania |
Beet necrotic yellow vein virus |
| Cb |
Leaf Spot |
Cercospora beticola |
| Pb |
Club Root |
Plasmodiophora brassicae |
| Rs |
Rhizoctonia Root & Crown Rot |
Rhizoctonia solani |
| Ps |
Downy Mildew |
Peronospora schachtii (ex Peronospora farinosa f.sp. betae) |
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Broccoli
| Disease Code |
Common Name |
Scientific Name |
| Cold |
Cold |
Cold |
| Heat |
Heat |
Heat |
| Hb |
Downy Mildew
|
Hyaloperonospora brassicae (ex Peronospora / Hyaloperonospora parasitica) |
| Pb |
Club Root |
Plasmodiophora brassicae |
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Brussels Sprouts
| Disease Code |
Common Name |
Scientific Name |
| Bolt |
Bolting |
Bolting |
| Pb |
Club Root |
Plasmodiophora brassicae |
| Foc |
Fusarium Yellows |
Fusarium oxysporum f. sp. conglutinans |
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Cabbage
| Disease Code |
Common Name |
Scientific Name |
| Foc |
Fusarium Yellows |
Fusarium oxysporum f. sp. conglutinans |
| Hb |
Downy Mildew
|
Hyaloperonospora brassicae (ex Peronospora / Hyaloperonospora parasitica) |
| Heat |
Heat |
Heat |
| Pb |
Club Root |
Plasmodiophora brassicae |
| TB |
Tip Burn |
Tip Burn |
| Xca |
Leaf Spot |
Xanthomonas campestris pv. armoraciae |
| Xcc |
Black Rot |
Xanthomonas campestris pv. campestris |
| Tt |
Thrips |
Thrips tabaci |
| Foa |
Fusarium Yellows |
Fusarium oxysporum f. sp. apii |
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Carrots
| Disease Code |
Common Name |
Scientific Name |
| Ad |
Alternaria Leaf Blight |
Alternaria dauci |
| Ay |
Aster yellows |
Aster yellows |
| Bolt |
Bolting |
Bolting |
| Cc |
Cercospora Leaf Blight |
Cercospora carotae |
| Crack |
Cracking |
Cracking |
| Eh |
Powdery Mildew |
Erysiphe heraclei |
| Ps |
Cavity Spot |
Pythium sulcatum |
| Mi |
Root-knot |
Meloidogyne incognita |
| Mj |
Root-knot |
Meloidogyne javanica |
| Xhc |
Bacterial leaf blight |
Xanthomonas hortorum pv. carotae |
| Gu |
Cavity spot |
Globisporangium ultimum |
| Gv |
Cavity spot |
Globisporangium violae |
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Celery
| Disease Code |
Common Name |
Scientific Name |
| Foa |
Fusarium Yellows |
Fusarium oxysporum f. sp. apii |
| Bolt |
Bolting |
Bolting |
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Corn
| Disease Code |
Common Name |
Scientific Name |
| Bm |
Southern Corn Leaf Blight |
Bipolaris maydis |
| Et |
Northern Leaf Blight |
Exserohilum turcicum |
| MDMV |
Maize Dwarf Mosaic Virus |
Maize dwarf mosaic virus |
| Ps |
Common Rust |
Puccinia sorghi |
| Pst |
Stewart's Wilt |
Pantoea stewartii |
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Cucumbers
| Disease Code |
Common Name |
Scientific Name |
| Cca |
Corynespora Blight and Target Spot |
Corynespora cassiicola |
| Ccu |
Scab and Gummosis |
Cladosporium cucumerinum |
| CMV |
Cucumber Mosaic Virus |
Cucumber mosaic virus |
| Co |
Anthracnose |
Colletotrichum orbiculare |
| CVYV |
Cucumber Vein Yellowing |
Cucumber vein yellowing virus |
| Pcu |
Downy Mildew |
Pseudoperonospora cubensis |
| PRSV |
Papaya Ring Spot Virus |
Papaya ringspot virus |
| Psl |
Angular Leaf Spot |
Pseudomonas syringae pv. lachrymans |
| Px |
Powdery Mildew |
Podosphaera xanthii |
| WMV |
Watermelon Mosaic Virus |
Watermelon mosaic virus |
| ZYMV |
Zucchini Yellow Mosaic Virus |
Zucchini yellow mosaic yirus |
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Eggplants
| Disease Code |
Common Name |
Scientific Name |
| TMV |
Tobacco Mosaic Virus |
Tobacco mosaic virus |
| ToMV |
Tomato Mosaic Virus |
Tomato mosaic virus |
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Herbs
| Disease Code |
Common Name |
Scientific Name |
| Pb |
Downy Mildew |
Peronospora belbahrii |
| Heat |
Heat |
Heat |
| Bolt |
Bolt |
Bolting |
| Fob |
Fusarium Wilt |
Fusarium oxysporum f. sp. basilicum |
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Leeks
| Disease Code |
Common Name |
Scientific Name |
| Ap |
Alternaria (Purple Blotch) |
Alternaria porri |
| Tt |
Onion Thrips |
Thrips tabaci |
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Lettuce
| Disease Code |
Common Name |
Scientific Name |
| BI |
Downy Mildew |
Bremia lactucae |
| Bolt |
Bolt |
Bolting |
| Fol |
Fusarium Wilt |
Fusarium oxysporum f. sp. lycopersici |
| Heat |
Heat |
Heat |
| LMV |
Lettuce Mosaic Virus |
Lettuce mosaic virus |
| Nr |
Lettuce Leaf Aphid |
Nasonovia ribisnigri |
| Pb |
Lettuce Root Aphid |
Lettuce Root Aphid |
| Rs |
Corky Root |
Rhizoharpis suberifaciens |
| TBSV |
Lettuce Die-Back Virus |
Lettuce Die-Back Virus |
| TB |
Tip Burn |
Tip Burn |
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Melons
| Disease Code |
Common Name |
Scientific Name |
| Ag |
Cotton Aphid |
Aphis gossypii |
| Fom |
Fusarium Wilt |
Fusarium oxysporum f. sp. melonis |
| Gc |
Powdery Mildew |
Golovinomyces cichoracearum |
| PRSV |
Papaya Ring Spot Virus |
Papaya ringspot virus |
| Px |
Powdery Mildew |
Podosphaera xanthii |
| S |
Sulfur |
Sulfur |
| WMV |
Watermelon Mosaic Virus |
Watermelon mosaic virus |
| ZYMV |
Zucchini Yellow Mosaic Virus |
Zucchini yellow mosaic virus |
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Onions
| Disease Code |
Common Name |
Scientific Name |
| Ap |
Alternaria (Purple Blotch) |
Alternaria porri |
| Ba |
Botrytis Neck Rot |
Botrytis allii |
| Foc |
Basal Rot |
Fusarium oxysporum f. sp. cepae |
| Heat |
Heat
|
Heat |
| Pd |
Downy Mildew |
Peronospora destructor |
| Pt |
Pink Root |
Pyrenochaeta terrestris |
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Peas
| Disease Code |
Common Name |
Scientific Name |
| BLRV |
Pea leaf roll, pea top yellows |
Bean leaf roll virus |
| Ep |
Powdery Mildew
|
Erysiphe pisi |
| Fop |
Near Wilt
|
Fusarium oxysporum f. sp. pisi |
| PEMV |
Pea Enation Mosaic Virus |
Pea enation mosaic virus |
| Psp |
Bacterial blight |
Pseudomonas syringae pv. pisi |
| Ns |
Fusarium root rot |
Neocosmospora solani (ex Fusarium solani) |
| Pv |
Downy mildew |
Peronospora viciae |
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Peppers
| Disease Code |
Common Name |
Scientific Name |
| CMV |
Cucumber Mosaic Virus |
Cucumber mosaic virus |
| Pc |
Buckeye Fruit and Root Rot |
Phytophthora capsici |
| PepMoV |
Pepper Mottle Virus |
Pepper mottle virus |
| PepYMV |
Pepper Yellow Mosaic Virus |
Pepper yellow mosaic virus |
| PVY |
Potato Virus Y |
Potato Y virus |
| TEV |
Tobacco Etch Virus |
Tobacco etch virus |
| Tm
|
Tobamovirus |
Tobamovirus |
| TMV |
Tobacco Mosaic Virus |
Tobacco mosaic virus |
| ToMV |
Tomato Mosaic Virus |
Tomato mosaic virus |
| TSWV |
Tomato Spotted Wilt Virus |
Tomato spotted wilt virus |
| Xspp |
Bacterial Spot |
Xanthamonas spp |
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Pumpkins
| Disease Code |
Common Name |
Scientific Name |
| Px |
Powdery mildew |
Podosphaera xanthii |
| ZYMV |
Zucchini yellows |
Zucchini yellow mosaic virus |
| Ds
|
Black root rot |
Diaporthe sclerotioides |
| WMV |
Watermelon mosaic |
Watermelon mosaic virus |
| Pcu |
Downy mildew |
Pseudoperonospora cubensis |
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Radish
| Disease Code |
Common Name |
Scientific Name |
| Ar |
Black root |
Aphanomyces raphani |
| For |
Fusarium Wilt
|
Fusarium oxysporum f. sp. Raphani |
| Hb |
Downy Mildew |
Hyaloperonospora brassicae |
| Heat |
Heat
|
Heat |
| Psm |
Bacterial Leaf Spot, Peppery Leaf Spot |
Peppery Leaf Spot |
| Rs |
Rhizoctonia scurf |
Rhizoctonia solani |
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Spinach
| Disease Code |
Common Name |
Scientific Name |
| CMV |
Cucumber Mosaic Virus |
Cucumber Mosaic Virus |
| Pe |
Downy Mildew |
Peronospora effusa |
| Sb |
Stemphylium leaf spot |
Stemphylium beticola |
| Wo |
White rust |
Wilsoniana occidentalis |
| Cd |
Anthracnose |
Colletotrichum dematium |
| Cv |
Leaf spot |
Cladosporium variabile |
| Fos |
Fusarium wilt |
Fusarium oxysporum f. sp. spinaciae |
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Swiss Chard
| Disease Code |
Common Name |
Scientific Name |
| Cb |
Leaf Spot |
Cercospora beticola |
| Ps |
Downy Mildew |
Peronospora schachtii
|
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Squash
| Disease Code |
Common Name |
Scientific Name |
| Px |
Powdery mildew |
Podosphaera xanthii |
| ZYMV |
Zucchini yellows |
Zucchini yellow mosaic virus |
| WMV |
Watermelon mosaic |
Watermelon mosaic virus |
| PRSV |
Papaya ringspot |
Papaya ringspot virus |
| CMV |
Cucumber mosaic |
Cucumber mosaic virus |
| Pcu |
Downy Mildew |
Pseudoperonospora cubensis |
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Tomatoes
| Disease Code |
Common Name |
Scientific Name |
| Fol |
Fusarium wilt |
Fusarium oxysporum f. sp. lycopersici |
| Ss |
Gray leaf spot |
Stemphylium solani |
| Vd |
Verticillium wilt |
Verticillium dahliae |
| Va |
Verticillium wilt |
Verticillium albo-atrum |
| TSWV |
Tomato spotted wilt |
Tomato spotted wilt virus |
| Ma |
Root-knot |
Meloidogyne arenaria |
| Mi |
Root-knot |
Meloidogyne incognita |
| Mj |
Root-knot |
Meloidogyne javanica |
| ToMV |
Tomato mosaic |
Tomato mosaic virus |
| Aal |
Alternaria stem canker |
Alternaria alternata f. sp. lycopersici |
| Sl |
Gray leaf spot |
Stemphylium lycopersici |
| Sbl |
Gray leaf spot |
Stemphylium botryosum f. sp. lycopersici |
| For |
Fusarium crown and root rot |
Fusarium oxysporum f. sp. radicis-lycopersici |
| Pf |
Leaf mold |
Passalora fulva |
| TYLCV |
Tomato yellow leaf curl |
Tomato yellow leaf curl virus |
| ToTV |
Tomato torrado |
Tomato torrado virus |
| Crack |
Cracking on fruit |
Cracking |
| N |
Nematodes |
Nematodes |
| V |
Verticillium wilt |
Verticillium (unspecified) |
| Heat |
Heat |
Heat |
| Pi |
Late Blight |
Late Blight |
| Pst |
Bacterial Speck |
Bacterial Speck |
| TMV |
Tobacco Mosaic Virus |
Tobacco mosaic virus |
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Turnips
| Disease Code |
Common Name |
Scientific Name |
| Bb |
Cabbage Aphids |
Cabbage Aphids |
| TuMV |
Turnip Mosaic Virus |
Turnip Mosaic Virus |
| Bolt |
Bolt |
Bolting |
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Watermelons
| Disease Code |
Common Name |
Scientific Name
|
| Co |
Anthracnose |
Colletotrichum orbiculare |
| Fon |
Fusarium Wilt |
Fusarium oxysporum f. sp. niveum |
| HH |
Hollow Heart |
Hollow Heart |
| Px |
Powdery mildew |
Podosphaera xanthii |
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