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West Central Africa 2020 | English Version

Resistances Explanation

Resistances Explanation of used abbreviations Resistances in varieties of our crops will be coded (please, see our coding list on www.enzazaden. com for explanation), unless indicated otherwise. Varieties claiming the same level of resistance against a specific pest or pathogen may exhibit a different resistance response due to a different genetic makeup of a variety.It is to be noted that if a resistance is claimed in a plant variety it is limited to the specified biotypes, pathotypes, races or strains of the pest or pathogen. If no biotypes, pathotypes, races or strains are specified in the resistance claim for the variety, it is because no generally accepted classification of the cited pest by biotype, pathotype, race or strain exists. In this case resistance is only claimed against certain not further specified isolates of that pathogen. New biotypes, pathotypes, races or strains that may emerge are not covered by the original resistance claim. Immunity: not subject to attack or infection by a specified pest or pathogen Resistance: the ability of a plant variety to restrict the growth and development of a specified pest or pathogen and/or the damage they cause when compared to susceptible plant varieties under similar environmental conditions and pest or pathogen pressure. Resistant varieties may exhibit some disease symptoms or damage under heavy pest or pathogen pressure. Two levels of resistance are defined: • High resistance (HR): plant varieties that highly restrict the growth and development of the specified pest or pathogen under normal pest or pathogen pressure when compared to susceptible varieties. These plant varieties may, however, exhibit some symptoms or damage under heavy pest or pathogen pressure. • Intermediate resistance (IR): plant varieties that restrict the growth and development of the specified pest or pathogen, but may exhibit a greater range of symptoms or damage compared to highly resistant varieties. Intermediate resistant plant varieties will still show less severe symptoms or damage than susceptible plant varieties when grown under similar environmental conditions and/or pest or pathogen pressure. Susceptibility: the inability of a plant variety to restrict the growth and development of a specified pest or pathogen. Tolerance: the ability of a plant variety to endure abiotic stress without serious consequences for growth, appearance and yield. Vegetable companies will continue to use tolerance for abiotic stress. Full explanation available on www.enzazaden.com Lettuce Code English name Scientific name pathogen ISF Races/Strains Level of resistance Virus LMV Lettuce mosaic Lettuce mosaic virus 1 IR Fungi Downy mildew Bremia lactucae Bl:16-36EU HR Zucchini Code English name Scientific name pathogen ISF Races/Strains Level of resistance Fungi Px Powdery mildew Podosphaeria xanthii (ex Sphaerotheca fuliginea) Virus ZYMV Zucchini yellows Zucchini yellow mosaic virus IR WMV Watermelon mosaic Watermelon mosaic virus IR PRSV Papaya ringspot Papaya ringspot virus IR Cucumber Code English name Scientific name pathogen ISF Races/Strains Level of resistance Virus CMV Cucumber mosaic Cucumber mosaic virus IR CVYV Cucumber vein yellowing Cucumber vein yellowing virus IR Fungi Px Powdery mildew Podosphaeria xanthii (ex Sphaerotheca fuliginea) IR IR Squash Code English name Scientific name pathogen ISF Races/Strains Level of resistance Explanation of used abbreviations Tomato Code English name Scientific name pathogen ISF Races/Strains Level of resistance ToMV Tomato Mosaic Virus Tomato mosaic virus 0,1,2 HR Virus TSWV Tomato spotted wilt Tomato spotted wilt virus IR ToANV Tomato apex necrotic virus Tomato apex necrotic virus HR Ff (ex Cf) Leaf mold Fulvia fulva (ex Cladosporium fulvum) A,B,C,D,E HR Fol Fusarium wilt Fusarium oxysporum f.sp. lycopersici 0,1,2 HR For Fusarium crown and root rot Fusarium oxysporum f.sp. radicis-lycopersici HR Fungi On (ex Ol) Powdery mildew Oidium neolycopersici IR Pl Corky root rot Pyrenochaeta lycopersici IR Va Verticillium wilt Verticillium albo-atrum 0 HR Vd Verticillium wilt Verticillium dahliae 0 HR Ma Root-knot Meloidogyne arenaria IR Nematode Mi Root-knot Meloidogyne incognita IR Mj Root-knot Meloidogyne javanica IR Abiotic stress Si Silvering T Virus PRSV Papaya ringspot Papaya ringspot virus IR Fungi WMV Watermelon mosaic Watermelon mosaic virus IR ZYMV Zucchini yellows Zucchini yellow mosaic virus IR Px Powdery mildew Podosphaeria xanthii (ex Sphaerotheca fuliginea) Pepper Code English name Scientific name pathogen ISF Races/Strains Level of resistance Virus Tm - Pepper mild mottle virus, Tobacco mild green mosaic virus, Tobacco mosaic virus, Tomato mosaic virus IR 0, 1, 1.2, 1.2.3 HR TSWV Tomato Spotted Wilt Virus Tomato spotted wilt virus 0 IR PVY Potato Y Potato Y virus 0,1,1.2 HR TEV Tobacco etch Tobacco etch virus IR Bacteria XCV Bacterial spot Xanthomonas campestris pv. vesicatoria 1-10 HR Disclaimer Descriptions, recommendations and illustrations in brochures and leaflets shall correspond as closely as possible to tests and practical experience and are subject to typographical and/or printing errors. This information shall be provided to assist professional growers and users, whereby variable local conditions must be taken into account. Under no circumstances shall Enza Zaden accept liability based on such information for deviating results in the cultivated product. Current information concerning the resistances is available on www.enzazaden.com. 30 | Enza Zaden Enza Zaden | 31

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