Corylus maxima

'Corylus maxima!'

The larvae feed on Corylus avellana, Corylus colurna and Corylus maxima.

The common hazel (Corylus avellana) and the filbert (Corylus maxima) are important orchard plants, grown for their edible nuts.

Corylus maxima, the filbert, is a species of hazel native to southeastern Europe and southwestern Asia, from the Balkans to Ordu in Turkey.

The nuts are edible, although smaller than the more commonly cultivated filberts (Corylus maxima, Corylus colurna, Corylus avellana, and hybrids thereof).

Other recorded host are Carpinus orientalis, Corylus colurna, Corylus maxima, Ostrya carpinifolia and Ostrya virginiana.

The purple-leaved cultivar Corylus maxima 'Purpurea' is a popular ornamental shrub in gardens, and has gained the Royal Horticultural Society's Award of Garden Merit.

It is readily distinguished from the closely related filbert (Corylus maxima) by the short involucre; in the filbert the nut is fully enclosed by a beak-like involucre longer than the nut.

A plant pathogen distributed in temperate regions, P. guttata causes a powdery mildew on leaves and stems on a broad range of host plants; many records of infection are from Corylus species, like filbert (Corylus maxima) and hazel (Corylus avellana).