In instances where a trees leaves are attacked, they cause the leaves to curl inward, protecting themselves against certain insecticide sprays. Both conifers (pine type trees) and deciduous (leafy trees) can be attacked by these pests.
Injury to the tree under attack is caused by these insects robbing trees of their sap. These insects remove massive amounts of sap, which is then excreted by the insect as ‘Honeydew’, a sticky, by-product of the insect. Dust and dirt in the air then adheres to this sticky substance and ‘sooty mold fungus’ forms, making the plant itself look unhealthy and personal items below it (such as cars, driveways, decks, patios, lawn furniture or children’s toys) dirty and sticky. If the population of these insects are left to increase unchecked, severe decline and even death of the tree can occur.