Pea Gall Sawfly - Pontania viminalis
The sawfly Pontania viminalis causes galls to form on certain Willow species
Anywhere that the host plants such as Crack-willow, Purple Willow and Osier are found.
There are two broods with adults flying May/June and July/August.
The pea shaped gall is formed on the midrib on the underside of the leaf and often reddens.
Occasional in Britain
Uncommon in Leicestershire and Rutland.
Leicestershire & Rutland Map
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