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Technical aspects of seed potato production Denis Griffin
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Technical aspects of seed potato production

Dec 20, 2021

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Page 1: Technical aspects of seed potato production

Technical aspectsof seed potato

production

Denis Griffin

Page 2: Technical aspects of seed potato production

Seed or Ware?

Page 3: Technical aspects of seed potato production

Why use clean seed?

• Seed quality is one of the most important yielddetermining factors that can be controlled

• Potatoes clonally propagated in soil

• Tubers spread soil borne diseases

• Tubers accumulate seed borne diseases

• Certification scheme established to ensure varietalpurity, generation control and freedom from

disease.

Page 4: Technical aspects of seed potato production

Geographic location advantages and disadvantages

● Northern regions have an

advantage for production ofvirus free seed due to lower

temperatures

● Elevation also limits virusspread by aphids

● The south east of the country

with less rainfall will have lessdisease pressure from both

blight and blackleg

● Southern regions may alsohave an advantage for early

harvest and export.

Page 5: Technical aspects of seed potato production

Land selection

Page 6: Technical aspects of seed potato production

Land selection

● High grade seed area

● Seed potato land scarce

● Large bank of virgin land

● Consider rotation

● Access to irrigation

● Proximity to ware crops

● Fields with a history

● Must be free from PCN

Page 7: Technical aspects of seed potato production

Soil Borne Diseases

Page 8: Technical aspects of seed potato production

Size management for seed

• Target yields 30-35 t ha-1

• Maximise valuable 35-55mm grade

• Plant high seed density 4.2-5 t ha-1

• Break apical dominance, do not sprout seed

• Can reduce nitrogen rate by 40-60 kg ha-1

• Variety dependant

• Early burn down and harvest spreads work load

Page 9: Technical aspects of seed potato production

Size management

0

1

2

3

4

5

6

7

40 60 80 100 120 140 160 180

Days After Planting

LA

I

80 tuber bulking days

Adapted John Burke

Page 10: Technical aspects of seed potato production

Size management

0

1

2

3

4

5

6

7

40 60 80 100 120 140 160 180

Days After Planting

LA

I

80 tuber bulking days

Adapted John Burke

Page 11: Technical aspects of seed potato production
Page 12: Technical aspects of seed potato production

Blackleg

• One of the most problematic diseasesin seed production

• Varieties differ greatly in susceptibility

• Pectobacterium spp most important inIreland

• Dickeyea not established in Ireland

• Important to avoid introduction ofDickeyea

• Rouging necessary to meetcertification standards

• Harvesting conditions, crop dryingand storage are important for control

Gillian Young AFBI

Page 13: Technical aspects of seed potato production

Rhizoctonia

Page 14: Technical aspects of seed potato production

Potato viruses

Aphid transmitted

Persistent

PLRV

Non persistent

PVY

PVA

Contact

PVX

PVS

Page 15: Technical aspects of seed potato production

Virus disease prevalence

34

27.4

41

1311

X

Yo,Yc

Yn

A

S

LR

6

83

35 3

X

Y

Y

A

S

LR

Fiona Hutton and Gerry Doherty

DAFF - 5,635 Samples tested over a 3 yearperiod 2008, 2009, 2010

Teagasc - 2,538 Samples tested over a 3 yearperiod 2008, 2009, 2010

Page 16: Technical aspects of seed potato production

Virus Y

• Two strains known in Ireland

• Virus Yo and Yn

• No Yntn

• Economically most important virus ofseed potatoes and hardest to control

• Persistent virus acquired andtransmitted in less than 30 seconds

• Insecticides prevent population buildup but not infection

• Paraffinic oils sprayed at weeklyintervals may be of use in future

• Roguing only effective controlmeasure

Page 17: Technical aspects of seed potato production

Virus Y secondary symptoms

Yo secondary symptoms Yn secondary symptoms

Page 18: Technical aspects of seed potato production

Storage

• Store hygiene

• Correct labelling

• Segregation of stocks

• Drying and prevention of condensation

• Handling at the correct temperature

• Prevention of dust borne diseases

• Protection from frost

Page 19: Technical aspects of seed potato production

Take home messages

• Land selection

• Size management

• Roguing

• Early burnoff

• Store hygiene

Page 20: Technical aspects of seed potato production

Thank youThank you