1. a small green insect that feeds on plant juices and is harmful to crops and garden plants
Usage: chiefly British

Examples

• The roses were covered with greenfly.
• She sprayed the plants to get rid of the greenfly.
• Greenfly can quickly damage young shoots.
• The gardener noticed greenfly on the bean plants.
• Ladybugs help control greenfly populations.
• The greenfly infestation spread to neighboring plants.