Disease Resistance Legend

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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