Scales:  Diaspis boisduvali,Aspidiotus destructor

Symptom of damage

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

Management

• 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 lace wing larvae Chrysoperla carnea
• Conserve the predatory Lady bird beetles Cryptolaemus montrouzieri ,Scymnus sp.
• Spraying of malathion 50 EC or phosalone 35 EC or methyl demeton 25 EC @ 1 ml/l