Marfona

Marfona is a fresh table variety with a yellow skin and light yellow flesh.

Tuber numbers are low and grading is regular. The tubers are big, oval round, of regular shape with shallow eyes. Dry matter content is moderate and cooking quality is firm. Cultivation can take place on most soil types, however Marfona is rather susceptible to Common Scab. The shape and size of tubers means Marfona is excellent for use as a baker.

  • Market outlet: table, baking & organic
  • Maturity: early maincrop
  • Storage: good dormancy
Marfona nestje met doorsnee
Marfona SNG CL®Agrico20
Marfona GRS®Agrico20

Cultivation
Pre-sprouting (chitting) is recommended. Removal of the sprouts more than once can have a negative effect on tuber numbers. Plant spacing at tuber size 35/55mm is 27cm (50,000 plants per Ha). Proper ridging is essential as tubers grow large and become green when not covered with soil. If correctly used, Metribuzin
(eg. Sencorex) does not result in reduction of yield, but discolouration of foliage can be seen. Initial development is good and further development is fine. Foliage is strong and soil coverage is good. Susceptibility to bruising is low.

Fertiliser treatment suggestions
The recommendation for Nitrogen is 25kgs less than standard. The recommendation for Potassium is 10% more than standard and for phosphate is standard.

Storage
The dormancy of Marfona is good and therefore suitable for long term storage at a temperature 5°C.

Resistance
Marfona can be susceptible to Common Scab and somewhat susceptible to Fusarium (Dry Rot) and Foliage Blight. Resistance to Viruses Yntn, Yn, X and A, Spraing and Tuber Blight is good. Marfona is resistant to Wart Disease fysio 1.

Marfona characteristics

Plant and tuber

  • Maturity
    Early maincrop | 6
  • Tuber shape
    Oval round
  • Flesh Colour
    Light yellow | 6
  • 5 low | 9 high
    Tuber number
    Low | 5
  • 5 small | 8 large
    Tuber size
    Quite large | 7,5
  • Skin colour
    Yellow
  • Flower colour
    White
  • 4 none | 8 many
    No. of berries
    Average | 6
  • 4 slow | 8 fast
    Foliage: - initial development
    Quite fast | 7
  • 4 slow | 8 fast
    Foliage: - final development
    Quite fast | 7,5
  • Foliage: - selectability
    Average | 6
  • 4 weak | 8 firm
    Foliage: - firmness
    Quite firm | 7
  • Lightsprout colour
    Red-purple
  • 4 irregular | 8 regular
    Uniformity of shape
    Quite regular | 6
  • 5 irregular | 8 regular
    Uniformity of size
    Quite regular | 6,5
  • 3 insufficient | 8 excellent
    Skin finish
    Average | 5,5

Quality characteristics

  • 6 average | 9 high
    Average yield
    High | 8
  • 300 low | 500 high
    Underwater weight
    349
  • A firm | AB rather firm | B rather floury | BC floury | C floury
    Cooking type
    Rather firm | AB
  • 4 short | 8 long
    Dormancy
    Average | 5,5
  • Resistance to harvest damage
    Quite sensitive | 6
  • 4 very sensitive | 8 minimum to none sensitive
    Secondary growth
    Quite sensitive | 6,5
  • 4 very sensitive | 8 minimum to none sensitive
    Growth cracks
    Quite sensitive | 6
  • 4 very sensitive | 8 minimum to none sensitive
    Black spot
    Quite sensitive | 6,5
  • 17% low | 26,5% high
    Dry matter content
    19,2%
  • 5 moderate | 8 excellent
    Dry matter distribution
    -
  • 1 very low | 11 quite high
    TGA level
    -
  • 4 very sensitive | 8 minimum to none sensitive
    Raw discolouration
    Quite sensitive | 6
  • 4 very sensitive | 8 minimum to none sensitive
    Discolouration after cooking
    Quite sensitive | 6
  • 4 insufficient | 8 excellent
    Suitable for chipping
    Moderate | 5
  • 4 insufficient | 8 excellent
    Suitable for crisping
    Insufficient | 4,5

Disease resistances

  • Late blight foliage
    Susceptible | 5
  • Late blight tuber
    Minimum susceptible | 7
  • Common scab
    Very susceptible | 4,5
  • PCN Ro 1/4
    -
  • PCN Ro 2/3
    -
  • PCN Pa 2 Pallida
    -
  • PCN Pa 3 Pallida
    -
  • Powdery scab
    Minimum susceptible | 6
  • Fusarium
    Susceptible | 5,5
  • Blackleg
    Minimum susceptible | 6
  • Black dot
    Susceptible | 5
  • Spraing
    Susceptible | 5
  • Leafroll
    Minimum susceptible | 6
  • A
    Minimum to non susceptible | 8
  • X
    Minimum susceptible | 7
  • Yn
    Minimum susceptible | 7
  • Virus - Yntn (tuber symptoms)
    Minimum susceptible | 7
  • Wart disease F1
    Resistant | 10
  • Wart disease F6
    -
  • Wart disease F18
    -