Insect Gall

Larry Trupp

Winnipeg, Canada

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Location: On the grounds of our Nature Center, FortWhyte Alive on the southwest edge of Winnipeg. Note: This is part of our teachings in kids programs at the Center, where I volunteer as an interpreter.

Model: Canon EOS DIGITAL REBEL XTi F stop: F/5.0 Exposure: 1/640 sec. Focal length: 150.0 mm Flash: flash did not fire, compulsory flash mode (16) Shutter speed (Tv): 9.3 Lens Sigma 150mm 2.8 Macro

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ImageWriting (2/24) on 22 April 2009


Some insects overwinter in galls. Galls are deformations of plants caused by insects. The deformation is caused when an insect such as a wasp, lays its eggs on a plant. Once the egg is deposited, it irritates the plant, and induces the plant tissue surrounding the egg to undergo abnormal growth, thus forming a gall. The gall forms a protective chamber for the developing eggs, larvae and pupae. The larvae then feed on the gall tissues. In the spring the small insect will eat a tiny hole, and escape into the world once again. There are over 1,500 insect species in North America that cause gall formations. Each species causes its own unique gall.

In summer galls can be seen as swellings, growths or disclosures on leaves, stems, twigs, flowers and fruits of trees and other plants. In the winter most galls can be seen on stems, and on twigs. Birds and mammals open galls seeking the insect inside. Galls are often found on goldenrod plants which is where I found this one

Artwork Comments

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