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Drisina glutinosa

Gall midge Drisina glutinosa

Description

Drisina glutinosa is a gall midge that forms distinctive galls on maples (Acer spp.), particularly on Acer pseudoplatanus and Acer platanoides. It is a monophagous species distributed across Europe. The lifecycle includes one generation per year, with larvae overwintering in the soil and emerging as adults in spring. Galls are formed in May on the undersides of leaves, where larvae develop in a drop of liquid within a depression.

The presence of Drisina glutinosa can reduce the aesthetic value of host trees by causing discolored spots and deformations on leaves. While the damage is mostly superficial, repeated infestations may mildly affect the photosynthetic capacity of the tree.

Symptom

On the undersides of leaves, small depressions house white larvae within a drop of liquid. The surrounding tissue often appears yellowed or discolored. Vacated galls dry and fall out, leaving holes. Infestation looks like yellong round spots on the leaf upper side.

The most significant differences between dmages, caused by two similar species Acericecis campestre and Drisina glutinosa lie in their host plant preferences. Acericecis campestre is primarily associated with Acer campestre (field maple) and sometimes other maples, whereas Drisina glutinosa predominantly infests Acer pseudoplatanus (sycamore maple) and Acer platanoides (Norway maple).

Tree Species: Maple

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes