Plant Parasites of Europe

leafminers, galls and fungi

Eriocampa ovata

Eriocampa ovata (Linnaeus, 1758)

woolly alder sawfly

on Alnus

Eriocampa ovata larva

Hoofddorp, 26.ix.2021 © Laurens van der Linde

Eriocampa ovata: larva on Alnus glutinosa

Alnus glutinosa, Belgium, prov. Hainaut, Chimay, Etang de Virelles, 13.viii.2014 © Stéphane Claerebout

Eriocampa ovata: larva on Alnus glutinosa

larva, dorsal,

Eriocampa ovata: larva on Alnus glutinosa


Eriocampa ovata: larva on Alnus glutinosa



Eggs are deposited in a row of up to eight in the upper side of the midrib. They long remain recognisable as a row of oval swellings, also after the eggs are vacated, The larvae leave the eggs at the underside of the leaf, and remain feeding at the underside. They are caterpillar-like and in all except the latest stage covered by a dense felt of snow-white downy wax. Each time they start feeding on a new part of a leaf they gnaw the main veins, causing the leaf to wither. Preference for older leaves. The species is fully parthenogenetic.

host plants

Betulaceae, monophagous

Alnus glutinosa, incana.

Savina & Chevin moreover mention Corylus, Frangula.



distribution within Europe

(PESI, 2019).


Beneš & Holuša (2015a), Benson (1961a), Buhr (1964a), Chevin (1984a), Haris (2012a), Hoop (1983a), Kruse, Smith & Schiff (2010a), Macek (2012c), Roskam (2019a), Pschorn-Walcher & Altenhofer (2000a), Savina & Chevin (2012a), Taeger, Altenhofer, Blank, ao (1998a), Zwakhals & Blommers (2022a).

Last modified 7.viii.2023