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Dichomeris marginella

Juniper webber

Description

Juniper webber Dichomeris marginella is a small moth species of the family Gelechiidae associated mainly with junipers. Larvae develop on common juniper (Juniperus communis) as well as on ornamental and introduced juniper species, including Juniperus chinensis, J. horizontalis, J. recurva and J. virginiana. Caterpillars initially mine juniper needles and later feed externally within silken webs formed between needles and shoots. The species overwinters in larval stage and has one generation per year. It usually occurs in gardens, parks and natural habitats with juniper stands. The intensity of attack is usually not strong, but local outbreaks may negatively affect the aesthetic appearance of shrubs, especially in ornamental plantings, and repeated feeding can worsen the overall health condition of host plants. The species is widely distributed across Europe and has also been introduced to other regions.

Symptom

Silken webbing between needles and shoots is present. Needles inside the webs are damaged, partially eaten or hollowed, often mixed with frass.

Tree Species: Juniper

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No