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Bean and Pea Seed Fly

30
Jun, 2017
By Sally Osgerby
  • Blog,Peas & Beans,Pests & Diseases
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Bean and Pea seed fly (Latin name – Delia platura, Delia florilega)

  • Adult fly is very small (3 to 6 mm long) & grey in colour
  • Eggs are pearly white, elongated & 1 mm long, laid on the soil surface
  • Larva or maggot is white & grows to 8 mm long – feeds on germinating seed
  • Pupa are red-brown, & 5 mm.
pea seed fly pupa

pea seed fly pupa

Damage Caused by Bean and Pea seed fly:

  • partial or total failure of seedlings to emerge.
Pea Seed Fly Damage

Pea Seed Fly Damage

  • Seeds often tunnelled and the maggots can be found inside the developing root or stem.
peaseedfly damage

peaseedfly damage

 

  • malformed seedlings due to damaged stem & leaves – if growing centre is damaged the seedling ’snakes’.
pale pea seedling

pale pea seedling

Damage is caused by the larvae of the bean/pea seed fly, which develop from eggs laid on the soil surface and feed on the germinating seed. The larvae turn into pupae, which can be found in the soil around the damaged seedlings.

pupa pea seed fly

pupa pea seed fly

 Control of Bean and Pea seed fly:

  • Chemical control: use treated seed
  • Cultural control:
  1. use stale seedbed, as the fly lays eggs in freshly disturbed soil.
  2. soils high in organic matter also attract flies
  3. avoid soil with dead vegetation as maggots are scavengers & flies are attracted to vegetable matter
  4. do not plant seed too deep

 

Bean and Pea seed fly can cause severe damage to peas and beans in the garden, but the severity of attack depends on the season.

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