Isolate any infested plants from the rest of the crop to prevent spreading since these are difficult pests to remove once they have found a home.
Adult armoured scale bugs can be removed manually if the population is low by coating them with alcohol or horticultural oil using a q-tip.
If the population is too large then repeated applications of horticultural oil to the bug can help by suffocating the insect.
The larvae may also be controlled by using predatory insects such as lady beetles or lacewing.