r

MISCELLANEOUS REPORTS 7 ISSN 0253-6749

EVALUATION OF POTATO VARIETIES

AND SEEDLINGS IN CYPRUS, 1973-82

N. J. Vakis

AGRICULTURAL RESEARCH INSTITUTE

MINISTRY OF AGRICULTURE AND NATURAL RESOURCES

NICOSIA CYPRUS

DECEMBER 1982

EVALUATION OF POTATO VARIETIES AND SEEDLINGS IN

CYPRUS, 1973-82

N. J. Vakis

SUMMARY

More than two hundred potato varieties and seedlings were introduced during the decade 1973-1982 for evaluation in Cyprus. The main criteria for selection were earliness, rate of bulking, yield potential, growth pe.rfo!mance, resistance to pests and diseases, and tuber quality (dry matter content, keeping and cooking quality. CTlSplllg, flesh colour, size, shape, depth of eyes).

Introductions were made from several state and private breeding stations in Holland, Scotland, N. Ireland, Ireland, Denmark, Sweden, and W. Germany. The performance of these introductions was evaluated mainly at Xylophagou but occasionally also at Athalassa and Akhelia. As a result of this testing eight new varieties, Le. Alcmaria, Aminca, Baraka, Caca, Cardinal, Diamant, Marfona and Nicola were recommended for commercial production. These varieties together with Spunta have replaced all standard varieties grown in Cyprus until 1973, except Arran Banner.

INTRODUCTION

Breeding and evaluation of new potato varieties is a contnnuous process. It usually takes fifteen years from an initial cross until a new variety can be made available for commercial use. All seed exporting countries have developed intensive potato breeding and evaluation programmes. In Cyprus potato cross­breeding work has not been attempted due to the high cost involved and the limited possibilities for exporting seed potatoes. The main dis~ advantage of the lack of a local cross-breeding programme is the risk that seedlings which might be promising for Cyprus are often discarded by the breeder who selects for his own conditions and requirements. To minimize such risks the Agricultural Research Institute ha::. recently intitiated cooperation with foreign breeding stations which supply seed tubers of advance seedlings at the early stages of deVeloping a new variety (usually 3-4 y(ars after the initial cross).

Cyprus has established a vigorous industry of ware potato production. To back this industry varieties bred at foreign breeding Stations are introduced and tested locally. The need for testing of varieties under local conditions cannot be overemphasized as several factors determine the performance of potato cultivars. Their reaction to environmental factors, particularly daylength and temperature, has long been demonstrated (Burton, 1966; Smith, 1968). Yield, tuber quality and maturity also depend on soil conditions (Burton 1966; Smith, 1968). There­fore, continuous work is needed with the main objective to introduce as many potato varieties

and seedlings as possible and to select those which meet with the specific requirements of the Cyprus potato industry. The main criteria for ~election are earliness, yield potential, tuber quality, and resistance to pests and diseases.

During the decade 1973-1982, there have been con~idera?le changes in the varieties grown commercIally 10 Cyprus. As shown in Table 1, there has been a definite trend for early­maturing varieties, due to the need for advancing exports of ware potatoes as early in the year as possible. Arran Banner is the only cultivar which continued to be grown commercially after 1973, together with Spunta, which entered commercial production at the initiation of this work.

TABLE 1. Imports of seed potatoes

Perctntage of total imports

Variety Maturity 1973 1982 1983*

Arran Banner Up-to-Date Spunta Cara Nicola Other

Medium Late Early Very late Medium

84 8 4 0 0 4

24 0

45 12 15 4

23 0

47 12 12 6

Source: The Cyprus Potato Marketing Board

* Provisional data. Total quantity to be impo­rted about 11,000 tons.

1

In this report the results of the evaluation of potato vari~ties over the period 1973-~982 are briefly described. Data are given on yIeld, earliness, tuber quality and the main horticultural features of most of the varieties tested. Work on potato variety trials conducted in Cyprus unt!l 1973 has been published by Economides, VaklS and Ioannou (1973) and Soteriadou (1964).

MATERIALS AND METHODS

Seed sources. Seed tubers .were obtained 'from state agencies and private breeding stations in Holland, Scotland, N. Ireland, Ireland, Denmark, Sweden, and W. Germany. A list of all varieties and seedlings tested during the decade is presented in Tables 2 and 3.

Screening work. Newly introduced material was first screened at Xylophagou (the major potato growing area) and at Athalassa. Observations and data were kept on emergence, plant growth, disease resistance, yield and maturity.

Replicated trials. Selected varieties and seedlings were tested in the following season in replicated trials at Xylophagou and other locations. Randomized complete block designs with 4-8 replications were used. Promising varieties and seedlings were tested under similar conditions for 2-3 years and the final selections were recommended to the Department of Agriculture for demonstration to the growers.

~emi-commercialproduction. ProJP.ising varieties which perform satisfactorily in replicated trials and demonstrations are then imported in small quantities for testing under farm conditions. In this way, the growers themselves play an impo~ rtant role in the acceptance of anew variety. If a variety is accepted by the growers, it is reco­mmended to the Cyprus Potato Marketing Board for commercial production.

According to the procedure described above, rt usually takes 5-6 yeaxs for anewty introduced variety to reach commercial status in Cyprus:

Cultural aspects. Cut seed of about 30-40 g was used but in the case of advance seedlings whole seed was used. Spacing in the row was 20 cm; the rows were 60 cm apart. Where the trials were conducted in growers' fields, the seed was planted by Institute's staff, but the grower carried out all cultural practices, i.e. earthing-up weed control, irrigation, preventive sprays against blight, etc.

Assessment of varieties and seedlings. During the growing season the varieties were assessed fbr emergence, foliage cover and appearance, stem number, susc('ptibility to blight and other foliar diseases, and maturity. Maturity was assessed visually (foliage, skin setting). There were two liftings. The first was done when the early varieties were considtred commercially mature and the second when the late varieties reached maturity.

: .At haryest, records, were taken on total ·and exportable yield, and visual observations were made on tuber maturity. Tuber samples were evaluated for dry matter content, cooking quality, crisping colour and keeping quality. Brief descriptions were made of tuber shape, size, depth of eyes, flesh colour, skin colour, etc.

RESULTS

Yield, maturity and quality features. Data on yield, maturity, and dry matter and starch content for the varieties/seedlings tested in replicated trials are shown in Table 4. For ease of comparison only data obtained at Xylophagou during spring are presented.

Horticultural features. A brief description of the varieties pr('sently recommended fOf tommercialproduction in Cyprus is given below. For reference, short notes are also presented for varieties which were selected as promising but did not reach commercial status. A botanical description of these varieties was not attempted. Such descriptions ale available in the literature (Anon., 1965; Hogen-Esch. et aI., 1955), from which information was drawn on disease resi­stance ;.[or some of the varieties described· in ~this report.

A. Varieti~s presently recommended for commercial production

ALCMARIA Origin:­ Holland. Plant: Stems 2-3, rather thin. Leaves

large, drooping, dark green. Inflorescences large and rathq numerous with few reddish purple flowers. .

Maturity: Early. Yield: Good. Tubers: Large, long oval, mainly rough.

Yellow skin. Eyes shallow. Flesh light yellow.

Dry matter: Low. Crisping quality: Good; creamy crisps.

2

Diseases: Susceptible to leaf blight, mode­rately susceptible to tuber blight. Fairly resistant to virus A. Immune to wart disease. Resistant to potato root eelworm (Biotype A).

AMINCA Origin: Holland. Plant: Stems 1-3, thick. Leave.s large,

drooping, yellowish. Inflore­scences fairly small and rather few, with very few light reddish purple flowers.

Maturity: Early. Yield: Good. Tubers: Medium, oval long, sometimes

pear shaped. Mainly smooth yellow skin. Eyes shallow. Flesh light yellow.

Dry matter: Medium. Crisping quality: Good; creamy crisps. Diseases: Susceptible to leaf blight, mode­

rately susceptible to tuber blight. Faitly resistant to virus A. Immune to wart disease. Resist­ant to potato root eelworm (Biotype A).

ARRAN BANNER Origin: N. Ireland. Plant: Stems 3-5, rather thick. Leaves

large, drooping, dark green. Inflorescences are numerous with white flowers.

Maturity: Medium. Yield: Very good. Tubers: Large, round, somewhat irregular.

Skin white. Eyes deep. Flesh white. .

Dry matter: High. Crisping quality: Good; light brown crisps. Diseases: Fairly susceptible to leaf blight,

moderately susceptible to tuber blight. Fairly resistant to virus Y. Immune to wart disease. Susceptible to chocolate spot.

BARAKA Origin: Holland. Plant: Stems 1-3, very thick and long.

Leaves rather large, fairly dark greyish gretn. Inflorescences sturdy and numerous with reddish purple flowers.

Maturity: Late. Yield: High. Tubers: Medium to large, oval long, some­

what irregular. Mainly smooth pale yellow skin. Eyes shallow. Flesh light yellow.

Dry matter: High. Crisping quality: Very good. Diseases: Moderately susceptible to leaf

blight, very good resistance to tuber blight. Fairly resistant to virus Y. Immune to virus A.

CARA Origin: Ireland. Plant: Stems 3-4, thick and long.

Leaves medium, rather drooping, green. Inflorescences numerous with many white flowers.

Maturity: Very late. Yield: High. Tubers: Medium to large, round oval.

Skin is white with reddish pink shallow eyes. Flesh white.

Dry matter: Low to medium. Crisping quality: Good; light brown crisps. Diseases: Resistant to leaf blight and tuber

blight. Immune to virus X. Very resistant to virus Y. Tolerant to leaf roll. Resistant to potato root eelworm (Biotype A).

CARDINAL Origin: Holland. Plant: Stems 3-5. Leaves rather large,

green. Inflorescences sturdy and fairly numerous with few dark reddish purple flowers;

Maturity: Late. Yield: High. Tubers: Medium, long oval. Occasion­

ally slightly tapering. Red skin, mainly rough. Shallow eyes. Flesh yellow.

Dry matter: High. Crisping quality: Very good; creamy crisps. Diseases: Moderately susceptible to leaf

blight, slightly susceptible to tuber blight. Immune to virus A. Immune to wart disease. Resist­ant to potato root eelworm (Biotype A).

DIAMANT Origin: Holland. Plant: Stems 3-4, strong. Leaves large,

dark green. Maturity: Medium. Yield: High. Tubers: Medium, long oval, somewhat

irregular, sometimes slightly flat­tened. Skin clear, smooth. Shallow eyes. Flesh yellow.

3

Dry matter: Medium to high. .8. Selected varieties which did not reach Diseases: Moderately susceptible to leaf commercial status

blight, tubers less susceptible. Immune to wart disease and virus A. Resistant to potato root eelworm (Biotype A).

MARFONA Origin: Holland. Plant: Stems 2-3, thick and strong.

Leaves rather large, light green. Maturity: Early. Yield: Good. Tubers: Medium, oval round. Yellow

skin. Eyes shallow. Flesh light yellow.

Dry matter: Low. Crisping quality: Good. Diseases: Fairly susceptible to leaf blight,

slightly susceptible to tuber blight.

NICOLA Origin: Holland. Plant: Stems 2-3, thick. Leaves fairly

small, rigid, light green. Inflore­scences small and not very numerous with few white flowers.

Maturity: Medium. Yield: Very good. Tubers: Medium, long oval. Smooth

yellow skin. Eyes shallow. Flesh yellow.

Dry matter: Medium. Crisping quality: Fair; dark brown crisps. Diseases: Fairly susceptible to leaf blight,

only slightly susceptible to tuber blight. Immune to virus A and X. Immune to wart disease. Resistant to potato root eelworm (Biotype A).

SPUNTA Origin: Holland. Plant: Stems 2-3, thick. Leaves fa,irly

small, rather drooping, dark green. Inflorescences rather small with very few white flowers.

Maturity: Early (Fast bulking rate). Yield: High. Tubers: Very large, long, somewhat taper­

ing. Skin yellow. Eyes very shallow. Flesh light yellow.

Dry matter: Very low. Crisping quality: Fair; crisps medium brown. Diseases: Moderately susceptible to late

blight. Fairly susceptible to leaf roll. Fairly resistant to virus Y. Immune to virus A. Immune to wart disease.

.

ATICA (W. Germany)

AVONDALE (Ireland)

BINTJE (Holland)

BLANKA (Holland)

CAROLA (W. Germany)

CHRISTA (W. Germany)

CLEOPATRA (Holland)

CLIMAX (Holland)

DRAGA (Holland)

DRAYTON (Scotland)

ELEKTRA (Holland)

Early. Long oval, medium to small tubers. Eytos shallow. Flesh yellow. Yield very good. Dry matter content low. Late. Round, medium tubers. Eyes shallow. Flesh white. Yield very good. Dry matta content medium. Recommended for demonstration trials in 1983. Medium. Long oval, medium tubers. Eyes shallow. Flesh light yellow. Yield good. Dry matter content high. Early. Long oval, medium tubers. Eyes shallow. Flesh white. Yield good. Dry matter content medium. Early. Oval round, medium tubers. Eyes shallow. Fksh yellow. Yield good. Dry matter content medium. Early. Long oval, medium tubers. Eyes shallow. Flesh yellow. Yield good. Dry matter content medium. Resist­ant to potato root eelworm (Biotype A). Medium. Oval, medium tubffs with red skin. Eyes shallow. Flesh light yellow. Yield wry good. Dry matter content medium. ­Early. Oval, medium tubers. Eyes shallow. Flesh yellow. Yield good. Dry matter content medium. Early. Round, well-shaped, medium tubers. Eyes mode­rately deep. Flesh white. Yield good. Dry matter content medium. Late. Oval, medium tubers with parti-pink skin. Eyes shallow. Flesh light yellow. Yield good to very good. Dry matter content high. Recom­mended for demonstration ~rials in 1983. Medium. Oval round, large tubers. Eyes shallow. Flesh yellow. Yield very good. Dry matter content low. Recom­mended for demonstration trials in 1983.

4

EXODUS Medium. Long oval, very (Holland) large tubers. Eyes shallow.

Flesh white. Yield high. Dry matter content medium. Very firm texture.

FAMOSA Late. Oval, medium tubers (Holland) Eyes shallow. Flesh light

yellow. Yield very good. Dry matter content medium.

HERAKLES Late. Oval, round, medium (Holland) tubers. Eyes red shallow.

Flesh white. Yield very good. Dry matter content low.

HUMALDA Early. Oval, very large tubers. (Holland) Eyes shallow. Flesh light

yellow. Yield very good. Dry matter content low.

JAERLA Early. Oval, very large tubers. (Holland) Eyes rather shallow. Flesh

light yellow. Yield good. Dry matter content medium to high.

JESSICA Early. Oval round, medium (W. Germany) to small tubers. Eyes shallow.

Flesh yellow. Yield very good. Dry matter content medium.

MARIA Early. Long oval, large tubers. (Sweden) Eyes medium deep. Flesh

light yellow. Yield good. Dry matter content medium.

MARIS PIPER Medium. Oval, medium (Scotland) tubers. Eyes shallow. Flesh

white. Yield very good. Dry matter content high. Resistant to potato root eelworm (Biotype A). Non uniform sprouting of seed.

MONA LISA Early. Oval long, medium (Holland) tubers. Eyes shallow. Flesh

yellow. Yield good. Dry matter content low to medium. Recommended for demonstration trials in 1983.

MONITOR Medium. Oval, medium tubers, (Holland) somewhat irregular in shape.

Eyes rather medium deep. Flesh light yellow. Yield good. Dry matter content high.

OCTAVIA Late. Oval, medium tubers. (Denmark) Eyes shallow. Flesh yellow.

Yield very good. Dry matter content low to medium.

OSTARA Early. Oval, medium tubers, (Holland) mainly rough. Eyes shallow

Flesh light yellow. Yield very good. Dry ma.ter content high.

PENTLAND Late. Long oval, large DELL tubers and very uniform in size. (Scotland) Eyes shallow. Flesh white.

Yield very good. Dry matter content high.

PENTLAND Medium. Oval, medium tubers. IVORY Eyes shallow. Flesh whitt.

(Scotland) Yield very good. Dry matter content high.

PENTLAND Medium. Oval round, large SQUIRE tubers. Eyes shallow. Flesh

(Scotland) white. Yield very good. Dry matter content high. Non uniform sprouting of seed.

PLANETA Medium. Oval, medium tubers. (Holland) Eyes red shallow. Flesh yellow.

Yield high. Dry matter content low.

PREMIERE Very early. Round, oval, (Holland) medium tubers. Eyf-s shallow.

Flesh light yellow. Yield low. Dry matter content high. Rl sist­ant to potato root eelworm (Biotype A).

RADOSA Medium. Long oval, medium (Holland) tubers. Eyes rather shallow.

Flesh light yellow. Yield good. Dry matter content high.

RENOVA Medium. Oval, medium tubers. (Holland) Eyes shallow. Flesh light ye-llow.

Yield very good. Dry matter content medium.

RENSKA Early. Oval, medium tubers. (Holland) Eyes shallow. Flesh yellow.

Yield very good. Dry matter content medium. Recommended for semi-eommercial production in 1983.

SINAEDA Late. Round to oval, medium (Holland) tubers. Eyes fairly deep. Fit sh

yellow. Yield very good. Dry matter content high. Resistant to potato root eelworm (Biotype A).

UP-TO-DATE Late. Oval, medium tubers. (N. Ireland) Eyes shallow. Flesh white.

Yield very good. Dry matter content high.

VELOKA Medium. Oval to round, medium (Holland) tubers. Eyes shallow. Flesh

ydlow. Yield high. Dry matter content high. Recommended for demonstration trials in 1983.

VULCANO Early. Oval, medium tubers. (Holland) Eyes shallow. Flesh yellow.

Yield good. Dry matter content low to medium. Recommended for demonstration trials in 1983.

284(3881/12) Medium. Round oval, medium (Ireland) to large tubers. Eyes medium

deep. Flesh light yellow. Yield very good. Dry matter content high. Recommended for demonstration trials in 1983.

5

TABLE 2. Alphabetical list of potato varieties tested during 1973-82

Variety Seed origin

Arran Banner N. Ireland, Scotland. Adema HoIlland Afke " Ajax " Aladin Alcmaria " Almere " Altena " Alwin " Amigo Aminca Anosta " Antona " Apatit W. Germany Arcula Holland Arsy " Atica W. Germany Aula " Ausonia Holland Avondale Ireland Baraka Holland Baillie Scotland Bintje Holland Blanka " Bornia " Brunia " Calimero Cara Ireland Cardinal Holland Carola W. Germany Caspar Holland Christa W. Germany Clada Ireland Claustar " Cleopatra Holland Climax " Compagnon Concurrent " Constante " Corine " Croft Scotland D-Biemond Holland Diamant " Diana Draga " Drayton Scotland Dundrum N. Ireland Dunluce " Dykhuis Holland Edzina " Elektra " Elvira "

6

Estima Exodus Fambo Famosa Fanfare Fatima Feja Fiona Fortuna Foxton Freia Garibaldi Gloria Gracia Grandifolia Grata Herakles Hertha Humalda nona Isna Jaerla Jansen Jessica Kaptah Karin Kerr's Pink Kingston Kirsty Kronia Lutina Maja Manna Mansour Marfona Maria Marijke Maris Bard Maris Piper Mirka Moniror Mona Lisa Morene Mulinda Nicola Nordstern Oakpark Amber Oakpark Avenger Oakpark Bounty Octavia Oscar Osiris Ostara Pax Pentland Crown Pentland Dell Pentland Hawk Pentland Ivory

Holland " "

w. Germany Holland Scotland W. Germany Scotland W. Germany Holland

"

W. Germany " "

Holland " "

W. Germany " "

Holland "

W. Germany Denmark Sweden N. Ireland Scotland

" Holland

" " "

Sweden Holland

N. Ireland. Scotland, " "

Holland " "

" "

W. Germany Ireland

" "

Denmark Holland

" " "

N. Ireland, Scotland, " " " " " "

Pentland Lustre Scotland, N. Ireland OMTZ 68-17 Holland Pentland Squire " " Omtzing 66-04 " Planeta Holland Rad 66-183 " Podzola " Ropta B1214 " Premiere " Ropta B1216 " Primula Denmark Ropta A4159 " Provost Scotland Ropta C956 " Radosa Holland Ropta D776 " Red Bad " Vd W70-26 " Reflecta " Vd Zee 71-12 " Renova Vk 73-71-6 " Renska Vk 72-721 " Rental " Vk 73-90-12 " Resonant " Vk 67-282 " Resy " Vk-69-47 " Rivelino " VR 76-81-2 " Romano " ZPC 73 G 189 " Sandra " ZPC 75-1-129 " Saturna " ZPC 73 G 48 " Selma W. Germany 6826 " Sinaeda Holland 70-46-2 " Sirco " 76-81-2 " Solei! " 76-83-2 " Spunta " L2665/135 N. Ireland Stormont Enterprise N. Ireland L2658/2217 " Strath Scotland L2658/2340 " Tertus Denmark L2594/223 " Troubadour Holland L2444/57 " Ukama " L2179/29 " UlIa W. Germany 478/3 " Ulster Classic N. Ireland, Scotland 2017/2 " Ulster Concord " " 2138/1 " Ulster Torch " " 562/3/2 " Univers Holland G65/20/1 " Up-to-Date N. Ireland, Scotland 1972/3 " Valeria W. Germany 1776/5 " Vegter Holland 2003/1 " Veloka " 519/6 " Vittorini " G64/523/8 " Vivaks " 974/2 Ireland Vokal " 531 " Vulcano 284 /3881/12) "

113 " 146 (2884/7) "

TABLE 3. List of potato seedlings tested 110 (431B3)during 1973-1982 117 (2269/5) "

135 (3757/4) " 139 (3787/2) "Seedling Seed origin 169 " 463 "

GE 64-941 Holland 466B4 " GE 71-699 " 70-0K-1O Denmark Ko 74-685 " 70-0G-2 " Konst 70-1230 " 70-0F-3 " MGB 353-72 " Lange 138/64 W. Germany MH 73-610 " PoW 69/20222 " MH 67-295 " SV 67117 Sweden Olde 69-12 " SV 66135 " OMTZ 66-78 " SV 64130 "

7

TABLE 4. Yield, maturity and quality characteristics of potato varieties . grown at Xylophagou over the period 197~82.

(1 donum=1338 m2)

Yield Dry Starch variety Seed (tons1 Maturity Fksh matter content content

origin donum) colour (%) (%)

1973

Exodus Holland 9.2 Medium White 18.7 13.0 Spunta· Holland 8.8 Early Light yellow 17.2 11.5 Arran Banner N. Ireland 8.7 Medium White 18.7 13.0 Vokal Holland 8.2 Early Yellow 16.6 10.9 Humalda Holland 7.5 Early Light yellow 17.6 11.9 Draga Up-to-Date Renova

Holland N. Ireland·· Holland

75 7.4 7.3

Early Lat\:. Medium

White White Light yellow

18.1 20.0 18.7

12.3 14.2 13.0

Ostara Pentland Dell

Holland N. Ireland

7.2 6.9

Early Late

Light yellow White

19.1 20.6

13.4 14.8

Blanka Holland 6.9 Early White 18.3 12.6 Climax Holland 6.8 Early Yellow 18.7 13.0 Monitor Octavia

Holland Denmark

6.8 6.7

Medium Late

Light yellow Yellow

20.6 18.5

14.8 12.8

Radosa Estima Primula

Holland Holland Denmark

6.6 6.5 6.4

Medium Medium Early

Light yellow Light yellow Light yellow

20.2 18.7 18.1

14.4 13.0 12:3

Vivaks· Holland 6.2 Early Light yellow 18.9 13.2 Tertus Denmark 6.1 Medium White 19.1 13.4 Resy Jaerla

Holland Holland

5.9 5.9

Medium Early

Yellow Light yellow

18.7 19.6

13.0 13.8

1974

Ewdus Holland 6.8 Medium White 20.0 14.2 Up-to-Date Tertus

N. Ireland Denmark

6.8 6.7

Late Medium

White White

20.8 19.1

15.0 13.4

Pentland Dell N. Ireland 6.6 Late White 21.2 15.4 Pentland Ivory Octavia

N. Ireland Denmark

6.3 6.3

Medium Late

White Yellow

20.6 18.1

14.8 12.3

Arran Banner N. Ireland 6.2 Medium White 20.4 14.6 S.V. 66135 Sweden 6.1 Late Light yellow 21.5 15.6 Ulla Spunta S.V. 64130

W. Germany Holland Sweden

6.0 5.8 5.8

Early Early Medium

Yellow Light yellow Light yellow

19.1 18.9 20.4

13.4 13.2 14.6

Blanka Maria Vokal Atica Renova

Holland Sweden Holland W. Germany Holland

5.8 5.7 5.7 5.6 5.6

Early Early Early Early Medium

White Light yellow Yellow Yellow Light yellow

19.4 19.1 17.9 17.4 19.6

13.6 13.4 12.1 11.7 13.8

Monitor Karin

Holland Sweden

5.4 5.4

Medium Late

Light yellow White

20.6 19.8

14.8 14.0

Lange Maris Piper Pohl Draga Grandifolia SV 67117

W. Germany N. Ireland W. Germany Holland W. Germany Sweden

5.1 5.1 5.0 4.9 4.9 4.8

Medium Medium Early Early Early Early

Light yellow White Yellow White Yellow Light yellow

19.4 20.8 19.8 19.1 20.2 21.7

13.6 15.0 14.0 13.4 14.4 15.8

8

TABLE 4 continued... Yield Dry Starch

Variety Seed origin

(tons/ donum)

Maturity Flesh colour

matter content (%)

content (%)

1975 SV 64130 VIla Atica Spunta Arran Banner

Sweden W. Germany W. Germany Holland N. Ireland

6.7 6.3 6.3 6.2 6.1

Medium Early Early Early Medium

Light yellow Yellow Yellow Light yellow White

19.9 19.9 18.0 19.6 20.8

14.1 14.1 12.2 13.8 15.0

Up-to-Date Renova Exodus

N. Ireland Holland Holland

5.8 5.8 5.7

Late Medium Medium

White Light yellow White

21.7 19.8 20.3

15.8 14.0 14.5

Pentland Dell Scotland 5.5 Late White 22.3 16.4 Pentland Ivory Maria SV 66135 Draga Bintje Christa Karin

Scotland Sweden Sweden Holland Holland W. Germany Sweden

5.4 5.1 5.0 5.0 5.0 4.9 4.8

Medium Early Late Early Medium Early Late

White Light yellow Light yellow White Light yellow Yellow White

21.9 19.4 22.8 19.8 20.7 19.4 20.5

16.0 13.6 16.9 14.0 14.9 13.6 14.7

Jaerla Monitor Selma Grata Maris Piper Blanka Vokal Apatit

Holland Holland W. Germany W. Germany Scotland Holland Holland W. Germany

4.7 4.7 4.6 4.6 4.5 4.3 4.2 2.6

Early Medium Medium Early Medium Early Early Early

Light yellow Light yellow Yellow Yellow White White Yellow Yellow

19.9 21.5 20.2 21.7 21.7 19.1 18.1 21.0

14.1 15.6 14.4 15.8­15.8 13.4 12.3 15.2

1976 Spunta Cara Edzina

Holland Ireland Holland

7.8 6.9 6.7

Early Very late Medium

Light yellow White Yellow

17.2 18.5 17.4

11.5 12.8 11.7.

Anosta Renova Arran Banner

Holland Holland N. Ireland

6.7 6.7 6.6

Medium Medium Medium

Light yellow Light yellow White

20.0 19.6 20.4

14.2 -13.8 14.6

SV 64130 Pentland Squire Maria Draga 974/2 Tertus

Sweden Scotland Sweden Holland Ireland Denmark

6.4 6.1 5.9 5.6 5.5 5.5

Medium Medium Early Early Late Medium

Light yellow White Light ydlow White White White

19.7 21.4 19.0 18.0 22.6 19.6

13.9 15.5 13.3 12.2 16.7 13.8

Up-to-Date N. Ireland 5.5 Late White 19.5 13.7 Christa Ulla Blanka G64/523/8 Atica

W. Germany W. Germany Holland N. Ireland W. Germany

5.4 5.3 5.2 4.7 1.96(a)

Early Early Early Medium Early

Yellow Yellow White Light yellow Yellow

19.4 18.9 17.9 17.6 17.7

13.6 13.2 12.1 11.9 12.0

(a) Non uniform sprouting of seed

1977 Spunta Cardinal

Holland Holland

6.3 6.0

Early Late

Light yellow Yellow

18.0 20.0

12.2 14.2

Arran Banner N. Ireland 5.9 Medium White 19.8 14.0 Cara Aminca Sinaeda

Ireland Holland Holland

5.5 5.4 5.4

Very late Early Late

White Light yellow Yellow

17.9 18.4 20.0

12.1 12.7 14.2

9

TABLE 4 continued... Yield Dry Starch

Variety Seed (tons{ Maturity Flesh matter content content - origin donum) colour (%) (%)'

Alcmaria Holland 5.3 Early Light yellow 17.5 11.8 Nicola Holland 5.3 Medium Yellow 18.1 12.3 U~to-Date N. Ireland 5.2 Late White 19.8 14.0 Matis Piper N. Ireland 5.2 Medium White 19.1 13.4 Vittorini Holland 4.9 Medium Light yellow 18.7 13.0 Anosta Holland 4.8 Medium Light yellow 19.1 13.4 Edzina Holland 4.3 Medium Yellow 18.6 12.9 Tertus Denmark 3.4 Medium White 18.5 12.8 Premiere Holland 2.8 Very early Light yellow 21.7 15.8

1978(a)

Cardinal Holland 6.5 Late Yellow 20.8 15.0 Cara Ireland 6.4 Very late White 18.4 12.7 Sinaeda Holland 6.4 Late Yellow 20.7 14.9 Aminca Holland 6.0 Early Light yellow 20.0 14.2 Nicola Holland 5.8 Medium Yellow 19.1 13.4 Maris Piper N. Ireland 5.8 Medium White 20.3 14.5 Alcmaria Holland 5.8 Early Light yellow 19.4 13.6 Arran Banner N:- Inland 5.8 Medium White 20.5 14.7

(a) All varieties except Arran Banner were resistant to Biotype A of the golden nematode. Grown in soil free of the golden nematode

1918 (b)

Cara Ireland 6.2 Very late White 19.0 13.3 Sinaeda Holland 6.0 Late Yellow 20.1 14.3 Cardinal Holland 5.6 Late Yellow 20.6 14.8 Alcmaria Holland 5.5 Early Light yellow 18.3 12.6 Aminca Holland 5.1 Early Light yellow 19.2 13.5 Nicola Holland 5.1 Medium Yellow 19.4 13.6 Arran Banner N. Ireland 4.5 Medium White 20.6 14:8 Maris Piper N. Ireland 4.4 Medium Whitl 20.6 14.8

(b) ,All varieties except Arran Banner were resistant to Biotype A of the golden nematode. Grown . in soil infested with the golden nematode

1979

Spunta Holland 7.9 Early Light yellow 16.7 11.0 Planeta Holland 7.2 Medium Yellow 17.3 11.6 Cara Ireland 7.2 Very late White 17.2 11.5 Renska Holland 7.1 Early Yellow 18.6 12.9 Manna Holland 6.8 Medium Yellow 17.1 11.4 Osiris Holland 6.7 Medium Yellow 17.1 11.4 Baraka Holland 6.7 Late Light yellow 19.0 13.3­Marfona Holland 6.5 Early Light yellow 16.3 10.7 Elvira Holland 6.5 Medium Yellow 18.0 12.2 Cleopatra Holland 6.4 Medium Light yellow 17.9 12.1 Famosa Holland 6.3 Late Light yellow 18.5 12.8 Saturna Holland 6.2 Late Yellow 22.7 16.8 Ajax Holland 5.6 Medium Light yellow 16.2 10.6 Arran Banner N. Ireland 5.5 Medium White 18.5 12.8 Troubadour Holland 5.3 Medium Yellow 17.5 11.8

10

TABLE 4 continued... Yield Dry Starch

Variety Seed (tons/ Maturity Flesh matter content content origin donum) colour (%) (%)

1982

Diamant Holland 6.0 Medium Yellow 18.9 13.2 Spunta Holland 5.9 Early Light yellow 17.1 11.4 Cara Ireland 5.8 Very late White 18.3 12.6 Veloka Holland 5.7 Medium Yellow 18.9 13.2 Avondale Ireland 5.6 Late White 18.5 12.8 Mansour Holland 5.5 Early Yellow 17.4 11.7 Herakles Holland 5.4 Late White 16.3 10.7 Vulcano Holland 5.4 Early Yellow 17.7 12.0 284 (3881/12) Ireland 5.3 Medium Light yellow 19.4 13.6 Sandra Holland 5.1 Medium Light yellow 19.1 13.4 Arran Banner N. Ireland 5.1 Medium White 19.1 13.4 Renska Holland 5.0 Early Yellow 18.7 13.0 Mona Lisa Holland 5.0 Early Yellow 18.2 12.4 Elektra Holland 4.9 Medium Yellow 16.4 10.8 L2179J29 N. Ireland 4.9 Latc White 18.3 12.6 Drayton Scotland 4.6 Late Light yellow 19.6 13.8 Marfona Holland 4.6 Early Light yellow 16.8 11.1 Dundrum N. Ireland 4.3 Late Light yellow 17.9 12.1 Afke Holland 4.1 Early Yellow 18.7 13.0 Croft Scotland 3.1(a) Late White 19.2 13.5

(a) Non unifonn sprouting of seed

ACKNOWLEDGEMENTS

I thank Mr. N. Onoufriou, Agricultural Research Techni­cian, for his skiIled technical assistance in field and laborato­ry work, the technical staff of the Horticultural Section for their assistance and all state and private agencies and breeders in Holland, U.K., Ireland, Denmark, Sweden and W. Germany for supplying seed tubers free of charge. The cooperation of potato growers at Xylophagou is also highly appreciated.

REFERENCES

Anon. 1965. British Atlas of Potato Varieties, Potato Marketing Board. The Parcener Press, London.

Hogen-Esch, J.A., F.E. Nijdam, and H. Siebeneicu. 1955. Dutch Potato Atlas. H. Veenman & Zonen. N.V. Holland.

Burton, W.G. 1966. The Potato. H. Veenman & Zonen N.V. Holland. 382 p.

Economides, c., N. Vakis, and A. Ioannou. 1973. Trials on Potato Varieties in Cyprus, 1969-1972. Technical BuUetin 11. Agricultural Research Institute, Nicosia. 20p.

Smith, O. 1968. Potatoes: Production, Storing, Proces­sing. The AVI Publishing Co. Inc. 642 p.

Soteriadou, AC. 1965. Report of Potato Trials for 1962­64. Department of Agriculture. 36 p.

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