Walnut
Walnut - Juglans regia
Spreading tree to 30 metres with smooth greyish bark eventually fissured. Leaves alternate, pinnate, with 7 to 9 elliptical untoothed leaflets, aromatic when crushed.
Often planted but sometimes naturalised.
Flowers April to May.
Deciduous.
Widespread and fairly frequent in England and Wales, mainly as a result of planting.
Occasional in Leicestershire and Rutland usually as a planted tree. In the 1979 Flora survey of Leicestershire it was found in 14 of the 617 tetrads but some specimens may not have been recorded at the time as planted trees were not always included depending on their location.
Graham Calow
Sharnford, Fosse Meadows
26 July 2020
Saharima Roenisch
Abbey Park
07 July 2017
Saharima Roenisch
Soar-GUC, Abbey Park to Belgrave
10 September 2020
David Nicholls
Shady Lane Arboretum
22 September 2016
David Nicholls
Shady Lane Arboretum
22 September 2016
Alan Semper
Bradgate Park
19 September 2017
Alan Semper
Teigh churchyard
17 June 2020
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Large Walnut Aphid
The Large Walnut Aphid (Panaphis juglandis) lives on the upper sides of leaves of Walnut. The fourth-instar nymph has transverse rows of brown patches on the dorsal abdomen. The adult alate is large and stout-bodied. It has a darkened head and thorax, and a yellow abdomen with dark brown transverse bands. The forewing veins are fuscous-bordered.
Walnut Leaf Gall Mite
The Walnut Leaf Gall Mite (Aceria erinea) causes galls to form on the leaves and occasionally the fruits of Walnut. Large yellowish blisters appear on the upper surface of the leaves with corresponding hollows on the underside which are lined with whitish or pale brown hairs among which the mites live and feed.
Walnut Blister Mite
The Walnut Blister Mite (Aceria tristriata) produces small blister like galls on the leaves of Walnut which often turn red. When a tree is severely affected the fruits may become galled as well.