There are two forms of insects that attack the leaves and buds of blueberry plants. The caterpillars of moths will use the leaves of the plant to create a cocoon while they transform. They will also feed on the leaves. These insects are not considered great dangers to a blueberry plant unless you have them in abundance.
There are also beetles (chafers and weevils) that will feed on the leaves and buds that are developing.
Both of these insects are not considered great dangers to the blueberry plant unless you have them in abundance. A plants leaves are essentially in the photosynthesis process and are required for a plant to thrive.
The blueberry maggot is the primary attacker of blueberries. These insects will lay their eggs in the fruit. The egg produces a maggot that feeds on the berries. When the fruit falls to the ground in the fall, the maggot will burrow into and winter in the soil, resulting in the adult fly the following spring. This adult begins the cycle anew.
There are two types of insects, leafhoppers and the aphids, that attack the plants' sap, or essential juices.
Leafhoppers reside on the underside of leaves or on the stems of the plant. They feed on the sap by piercing the plant and sucking out the juices. Though they do not do significant damage, as with any insect infestation, a large number of them can cause damage to the plant.
Aphids are much smaller than leafhoppers. They act on the same principle, living on the underside of leaves and on stems. They feed on the youngest of leaves and the tender shoots. They can cause the most damage to young, developing plants due to their numbers.
Both leafhoppers and aphids have been known to be transmitters for viruses that can affect blueberry production and should be monitored closely.