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Crop Protection :: Pests of Plum
San jose scale: Quadraspidiotus perniciosus

Symptoms of damage

  • Infestation causes purple discolouration on fruits and make them unfit for marketing
  • Infestation of shoots results in loss of vigour and death of young trees or branches
  • Fruit with haloes will be culled because of its unsightly appearance.

Identification of pest

  • Female scale is yellowish orange, round, slightly convex and raised a little at the centre with a black pustule
  • Males are small and more linear shape

Management

  • Select nursery stock free from scale infestation
  • Spray application of systemic insecticides like phosalone 0.05% and methyl demeton 0.025%
  • Field release of coccinellid predators like Chilocorus nigritus and parasitoid, Encarsia pernios
Purple discolouration - stems  
Purple discolouration - fruits

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