GALLS

POPLAR

Club-shaped Poplar Galls are caused by aphid Pemphigus populi. Greenish-yellow globular galls form on the mid-rib of Black Poplar leaves, near the leaf base. The galls become club-shaped with age. Fundatrices (females from overwintering fertilized eggs) induce the galls to provide a place for their offspring to develop.

Poplar-buttercup Aphid Galls are caused by the aphid Thecabius affinis. The aphids (which also live on buttercups) roll the leaves which then turn reddish. The aphids are covered in a shiny wax wool. 

Blister Galls on the upper surface of Black Poplar leaves are caused by fungus  Taphrina populina. A concaved orange area (inset) under the bulge on the lower leaf surface is where the fungus produces spores.

Spiral Galls on Black Poplar leaf stems are caused by aphid Pemphigus spyrothecae.

• Oak Galls
• Blackthorn Galls
• Dog Rose Galls
• Poplar Galls
• Willow/Sallow Galls
• More Tree Galls
• Other Plant Galls