Weigela (Weigela)
Plant Health Problems
Once established, weigela generally is disease-free.
Insect Problems:
Fourlined plant bug, Poecilocapsus lineatus.
The bugs often injure the tender terminal leaves of weigela. This bug lays eggs
in the soft stems. They hatch about the middle of May and the young bugs suck
the sap from the tender leaves. They molt five times and when mature, about the
middle of June, they have wings and are nearly 1/3" long. The insect body
is yellow, marked lengthwise on the wings with four black stripes alternating
with three green stripes. The injury to the leaves consists of sunken areas
around the punctures. These areas later appear as circular transparent spots
and finally as circular holes. This insect injures the new leaves of many
different kinds of annual and perennial plants and shrubs. There is one
generation each year. The nymphs can be managed by spraying with ultrafine
horticultural oil, insecticidal soap or malathion, which are among the
compounds registered for control of this pest in Connecticut. Imidacloprid,
applied as a soil drench, will provide season-long systemic control. Consult
the labels for dosage rates and safety precautions.