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Chrysanthemum Leaf Miner

Chromatomyia syngenesiae

Chrysanthemum Leaf Miner

A close up of a leaf mined by Chromatomyia syngenesiae Chrysanthemum leaf miner pupa
Photo by Jon Sullivan (CC BY 4.0)
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The Chrysanthemum Leaf Miner is a tiny leaf-mining fly. They belong to a family called Agromyzidae, which encompasses over 2,500 species of fly, all of which feed on various plants. Leaf-mining flies are rarely seen when adults. The larvae, however, are much easier to observe. Leaf-mining larvae tunnel through the inner tissues of foliage, leaving a unique trail, or mine, behind. The larvae of Chromatomyia syngenesiae mine the leaves of Chrysanthemum, Gazania, Senecio cineraria and Argyranthemum. In most cases, the damage is only aesthetic, with healthy plants tolerating light to moderate infestations. Plants kept under glass should be checked for damage all year around, and outdoor plants in the summer and autumn.
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Traits

Heavier infestations can cause wilting in plants.

Appearance

Adults: Adult flies are tiny, reaching only 3mm. They are brown-black. Females will leave a trail of small pale green spots on the upper sides of foliage from feeding. Larvae: Maggot-like, legless and creamy white. They vary between 3-4mm. Pupae: The cocoon-like structure which larvae develop inside of, is pale brown and can be seen where mines terminate. Mines: They're more easily distinguished using the leaf mines. Look out for long, white-brown meandering lines that trail randomly round the leaves of Chrysanthemums.

Symptoms

Trails of pale dots on leaves. Mining larvae can disfigure leaves. Heavier infestations tend to be indoors. Silvery-white meandering lines on the leaves of plants. Silvery-white blotches. Leaves may dry out and fall from plant early.

Activity

Diurnal

Personality

Order

Diptera

Family

Agromyzidae

Metamorphosis

Complete

Distribution

Europe and the UK

Biological treatment

Monitor plant foliage in summer and autumn and remove any damaged leaves as and when they're found.

Chemical treatment

There are currently no chemical treatments available for home gardeners for this type of plant.

Attracts

Chrysanth

Chrysanthemum spp.

Treasure Flower

Gazania spp.

Daisy

Argyranthemum spp.

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