Pemphigus Betae Aphid Inducing a Gall on <i>Populus angustifolia</i> Leaves (IMAGE)

American Phytopathological Society

Pemphigus Betae Aphid Inducing a Gall on <i>Populus angustifolia</i> Leaves

Caption

A, Fundatrix aphid inducing a gall near the base of the midvein on the upper surface of a poplar leaf. B, Young gall forming near the base of the midvein on the upper leaf surface. The fundatrix (approximately 0.6 mm long) moves back and forth in the gall depression (approximately 3 mm long) adjacent to the midvein continually probing the leaf tissue with her stylet and, within about 3 days, is completely enclosed in gall tissue. C, Side view of fully developed galls that have formed on the underside of the leaf from the activity of the fundatrix on the upper leaf surface.

Credit

A and B, Thomas G. Whitham; C, Heidi M. Appel.

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