Eriocampa ovata (Linnaeus, 1758)

woolly alder sawfly

on Alnus

parasite

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.

phenology

Bivoltine.

distribution within Europe

(PESI, 2019).

references

Beneš & Holuša (2015a), Benson (1961a), Buhr (1964a), Roskam (2019a), Pschorn-Walcher & Altenhofer (2000a), Savina & Chevin (2012a).

mod 9.xii.2019