Melon

Codes for pest organisms in melon

Scientific name pathogen ISF	English name	Code	Races/Strains	Level of resistance	Remark
Viruses
Cucumber mosaic virus	Cucumber mosaic	CMV		IR
Melon Necrotic Spot Virus	Melon necrotic spot	MNSV		HR
Papaya ringspot virus	Papaya ringspot	PRSV		IR
Watermelon mosaic virus	Watermelon mosaic	WMV		IR
Zucchini yellow mosaic virus	Zucchini yellows	ZYMV		IR
Fusarium oxysporum f.sp. melonis	Fusarium wilt	Fom	0	HR
Fusarium oxysporum f.sp. melonis	Fusarium wilt	Fom	1	HR
Fusarium oxysporum f.sp. melonis	Fusarium wilt	Fom	2	HR
Fusarium oxysporum f.sp. melonis	Fusarium wilt	Fom	1.2	IR
Fungi
Golovinomyces cichoracearum (ex. Erysiphe cichoracearum)	Powdery mildew	Gc	1	IR
Podosphaeria xanthii (ex Sphaerotheca fuliginea)	Powdery mildew	Px	1	IR
Podosphaeria xanthii (ex Sphaerotheca fuliginea)	Powdery mildew	Px	2	IR
Podosphaeria xanthii (ex Sphaerotheca fuliginea)	Powdery mildew	Px	5	IR
Insects
Aphis gossypii	Cotton aphid	Ag		IR

HR	highly resistant
IR	intermediate resistant
T	Tolerant

Schedule 2 - Resistance

1. - Terminology and definitions
   
   1. ‘Immunity’ means not subject to attack or infection by a specified pest or pathogen.
   2. ‘Resistance’ is 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 of pathogen pressure.
      Two levels of resistance are defined:
      
      1. 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.
      2. 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. Intermediately 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.
   3. ‘Susceptibility’ is the inability of a plant variety to restrict the growth and development of a specified pest or pathogen.
      
2. - Information per variety
   Resistances in varieties of our crops will be coded (see coding list at www.enzazaden.com ), unless indicated otherwise. In case a variety is resistant to more than one pathogen, the individual resistance codes will be separated by the symbol ‘/ ‘.
   
   If in a resistance code of a certain variety reference is made to certain strains for which the resistance is claimed this means that no resistance is claimed to other strains of the same pathogen.
   
   If, in a resistance code, no reference is made to strains of the pathogen for which the resistance is claimed, resistance is claimed only to certain not further specified strains of the pathogen and we hereby disclaim any guarantee that the variety will not be infected by the said pathogen.