Willow Redgall Sawfly - Pontania proxima
Adult Willow Redgall Sawflies are small - approximately 3.5-5 mm long. They are shiny, black and wasp-like. They cause a gall to form on certain species of willow and this gall is more likely to be seen than the adult sawfly.
Wherever White Willow or Crack Willow grow, usually damp open wooded areas, sometimes hedgerows.
Adult May to August
The larvae of the Willow Redgall Sawfly are pale green in colour with a dark head. They are small and caterpillar-like, reaching only 5 mm in length. Adults emerge in late spring, and females seek out suitable willows on which to lay eggs. The female inserts an egg into leaf tissue where it hatches and begins to eat the soft leaf tissue. This stimulates the leaf to produce a gall which is bean-shaped, smooth and emerges equally on both sides of the leaf. The gall may be green, red or yellow. A single larva feeds in the cavity of each gall.
Common and widespread in Britain
Common in Leicestershire and Rutland.
Leicestershire & Rutland Map
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