Orchid pests

Major Pests of Orchid are:-

1.Orchid Scales:  Diaspis boisduvali,Aspidiotus destructor

Orchid scales

Symptom of damage:

  • Nymphs and adults suck the sap from leaves
  • It damages both leaves and pseudobulbs
  • Honeydew excretion causes development of sooty mould fungus
  • Yellowing of leaves
  • Wither and dry up
  • It is the common armoured scale found on cattleya andcymbidium.


  • The root extract of plant Derris is recommended.
  • Spraying of fish oil rosin soap at 15 gms per lit of water.
  • Field release of green lacewing larvae Chrysoperla carnea
  • Conserve the predatory Ladybird beetles Cryptolaemus montrouzieri ,Scymnus sp.
  • Spraying of malathion 50 EC or phosalone 35 EC or methyl demeton 25 EC @ 1 ml/l

2.Orchid Mealy bugs

Orchid mealy bug

Symptom of damage:

  • Mealy bugs cover the stem and leaf, suck the sap, secrete honeydew and attract ants.
  • In severe infestation, sooty mould may develop on the leaves.
  • Affected plants lose their vigour.


  • Lady bird beetles Cryptolaemus montrouzieri and Scymnus sp. are known to feed mealy bugs.
  • Spray malathion 50 EC @ 1 ml/l of water.


3.Giant African Snail  – Achatina fulica 

gaint african snails

Symptom of damage:

  • They feed on the young leaves, roots, flower buds and even open flowers.
  • Slugs usually hide during day and become active during night
  • Presence of slimy fluid on foliage


  • Apply 15% metaldehyde dust or 20% metaldehyde liquid.
  • Sprinkle 5% metaldehyde pellets around the infested plant.
  • If the population is low, collect and destroy.


4.Orchid Mites: Tetranychus urticae, Brevipalpus australis, B. cauliformicus

Orchid Mites

Symptom of damage:

  • Red spider mite sucks the sap from cells of leaves – causing white specks.
  • In heavy infestation webbing on the plants.
  • This is a serious pest on orchids during the warm and dry season.


  • The predatory phytoseiid mites, Amblyseius sp. and Phytoseiulus persimilis are found to feed on spider mite.
  • Spray dicofol 18.5 EC or dimethoate 30 EC or methyl demeton 25 EC @ 2 ml/l of water.




  • TamilNadu Agritech Portal
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