corrective measures include:
• Keeping your bonsai in good health, since insects and bacteria tend to attack weak trees
• Giving your tree ample light, fresh air and ventilation
• Keeping the soil free of spent blooms and fallen leaves etc.
You may also use an insecticidal soap spray which is not harmful to humans or animals. This soap derivative, however, may require more than one application to control the insect population. It's also a good idea to use this spray weekly to prevent any attacks.
