Possible Clues:

• A doctorate all about one small insect
• Insect called a greenfly in Britain
• Sap-sucking garden pest
• Plant-eating insect
• How Father came back and concealed the fly that was green
• Pest that a political leader concealed
• Lacewing's munchie
• Gardening pest
• A non-medical doctor, one held to be a sucker
• Creature that reproduces by parthenogenesis