Pests and Diseases: Potato


Aphid:

  • Symptoms: Plant infested with greenfly.
  • Treatment: Spray at first sign of attack
  • Prevention: None

Blackleg:

  • Symptoms: Blackened stems at and below ground level. Leaves turn yellow and wilt.
  • Treatment: None
  • Prevention: Do not plant soft or rotten seed tubers and don’t cut tubers

Capsid Bug:

  • Symptoms: Small brown spots in leaves, later turn into holes
  • Treatment: Spray if attack is bad, will not affect yield
  • Prevention: None

Common Scab:

  • Symptoms: Ragged-edged scurfy patches. Only on the skin, the flesh is not affected.
  • Treatment: None
  • Prevention: Buy healthy seed tubers. Do not Lime.

Dry Rot:

  • Symptoms: Shrunken area with white pustules occur during storage.
  • Treatment: None
  • Prevention: Rotate crops. Ensure tubers are sound before storing and handle carefully.

Frost:

  • Symptoms: Black stems or yellow patches on leaves
  • Treatment: None
  • Prevention: Cover if frost is expected

Gapping:

  • Symptoms: Seed potatoes do not develop shoots
  • Treatment: None
  • Prevention: Buy healthy seed tubers and ensure they are kept in a frost-free location

Gangrene:

  • Symptoms: Dark brown depressions on the surface of the tuber
  • Treatment: None
  • Prevention: Store only sound tubers and keep air and frost-free

Hollow Heart:

  • Symptoms: Hollow centre of tubers
  • Treatment: None
  • Prevention: Keep well watered during dry spells

Leaf Roll Virus:

  • Symptoms: Leaves are rolled upwards and become hard and brittle
  • Treatment: None
  • Prevention: Buy healthy seed tubers. Spray to control the virus-carrying aphids.

Mosaic Virus:

  • Symptoms: Yellow or pale green mottling over the surface of the leaf
  • Treatment: None
  • Prevention: Buy healthy seed tubers. Spray to control the virus-carrying aphids.

Magnesium Deficiency:

  • Symptoms: Yellowing between the veins of the leaves which turns brown and brittle. Stunted growth.
  • Treatment: Apply MultiTonic and spray with Fillip
  • Prevention: Feed regularly during the growing season using a fertiliser with magnesium

Potato Blight:

  • Symptoms: Brown patches on the leaves with white mould on the underside of each spot. Can destroy all the foliage. grey patches below the skin.
  • Treatment: None
  • Prevention: Buy healthy seed tubers. Spray with Dithane in July and repeat every fortnight if the weather is damp. Keep earthed up.

Potato Cyst Eelworm:

  • Symptoms: Weak and stunted plants. Small tubers produced
  • Treatment: None
  • Prevention: Rotate crops. Don’t grow potatoes or tomatoes on infected land for at least six years

Powdery Scab:

  • Symptoms: Round patches with raised margins on the skin.
  • Treatment: None
  • Prevention: Rotate crops

Rosy Rustic Moth:

  • Symptoms: Hollow stems causing plants to die down early
  • Treatment: None
  • Prevention: None

Splitting:

  • Symptoms: Deep cracks on surface of tubers
  • Treatment: None
  • Prevention: Do not store. Keep plants well watered during dry spells.

Slugs:

  • Symptoms: Large holes in the tubers
  • Treatment: None
  • Prevention: Don’t add too much manure and lift tubers as soon as they mature. Keep the area free of rubbish.

Spraing:

  • Symptoms: Curved lines in the flesh
  • Treatment: None
  • Prevention: Rotate crops

Soft Rot:

  • Symptoms: Soft, evil-smelling flesh
  • Treatment: None
  • Prevention: Store only sound tubers and keep dry

Spindly Sprouts:

  • Symptoms: Thin shoots
  • Treatment: Stand tubers in a light cool place
  • Prevention: Buy healthy seed tubers and ensure they are sprouted in a light, frost-free location.

Soft Tubers:

  • Symptoms: Soft and rubbery tubers
  • Treatment: None
  • Prevention: Water well during drought conditions

Wireworm:

  • Symptoms: Orange, shiny larvae produce tunnels in the flesh of tubers
  • Treatment: None
  • Prevention: Rake Chlorophos into the soil before planting and lift tubers as soon as they are mature.

Wart Disease:

  • Symptoms: Black warty outgrowths on tubers
  • Treatment: None
  • Prevention: Only plant immune varieties on infected land

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