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Aceria myriadeum

Gall mite Aceria myriadeum

Description

It is also known under the name Aceria aceriscampestris. A tiny mite, about 0.15-0.2 mm in size. It has several generations during the year. In the spring, the females begin to suck on the leaves and thus initiate the formation of small galls in which the mites reproduce and live. The galls are small, only 1-2 mm in size and are often in large numbers on the upper side of the leaf. They can cover almost entire leave blade. Yellow-green, more often red. The mites overwinter hide in the bark crevices or near the buds. It lives almost exclusively on the field maple (Acer campestre). On this maple species also other similar mites can live, and it can be confused with them. Gall mite Aceria myriadeum reduces the aesthetic value of trees and, in extreme cases, the vitality of especially young maples.

Symptom

Galls, only 1-2 mm in size, and often in large numbers on the upper side of the leaf. Yellow-green, more often red.

Tree Species: Maple

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Mites

Invasive Species: No

Present in EU: Yes

Seasonal frequency of occurrence

Seasonal frequency of occurrence