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Crop Protection :: Peach
San jose scale: Qudraspidiotus perniciosus

Symptoms of damage

  • San Jose scales cause injury by feeding on twigs, branches, and fruit; they may also inject salivary toxins while feeding.
  • Heavy populations on the bark can cause gumming and kill twigs, branches, and entire trees if left uncontrolled.
  • A characteristic, red halolike discoloration often forms around the insect on small twigs or infested fruit.
  • 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 perniosi
Pink colour discolouration on stem  
Scales on fruits


SOURCE

www.ipm.ucdavis.edu, www.apidweb.com, ag.arizona.edu


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