Biological Control of Pests in Forests of Eastern United States




Image Number: 1929055
Subject: Canada thistle stem gall fly
Insecta > Diptera > Tephritidae
Urophora cardui (L.)
Host: Canada thistle
Magnoliopsida > Asterales > Asteraceae
Cirsium arvense (L.) Scop.
Photographer: Alec McClay, Alberta Research Council
Descriptor: Damage
Description: galls
Available Images Resolutions:
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1536x1024 215 kb
3072x2048 611 kb
Image Citation:
Mark Schwarzlander & Patrick Hafliger, CABI Biosciences,
Image Use:
This image may be copied and used, in whole or in part, for any non-profit, educational purpose provided that all reproductions bear an appropriate credit. Any commercial or other use of the image requires the written permission of the photographer and