Cornus, dogwood

fam. Cornaceae

1a corridor mine: Phytomyza agromyzina

1b blotch mine, from which in the end an excision is made => 2

1c fleck mine => 5

1d galls, etc => 100

2a excision almost as large as the blotch itself, round; oviposition scar at some mm from the leaf margin => 3

2b excision much smaller than the blotch, oval; oviposition on the leaf margin => 4

3a mining larva in May-June: Incurvaria pectinea

3b mining larva in July-August: Incurvaria oehlmanniella

4a length of the excision 4-5.5 mm; larva: abdomen dorsally white with a row of black dots: Antispila treitschkiella

4b length of the excision 5.5-7 mm; abdomen dorsally entirely white, except for the anal plate: Antispila metallella

5a pistol case: Coleophora anatipenella

5b lobe case =>

6a the pieces of epidermis, that are used to enlarge the case, are cut out of the upper epidermis: Coleophora violacea

6b … out of the lower epidermis: Coleophora ahenella

100a Nematoda => 101

100b Acari => 102

100c Coleoptera => 103

100e Diptera => 104

100f Hemiptera => 105

100d Hymenoptera => 106

100g rust fungi => 107

100h smut fungi => 108

100i powdery and downy mildews => 109

100j other causers => 110

104 – Diptera

104a Cecidomyiidae: Craneiobia corni

105 – Hemiptera

105a Aphididae: Anoecia corni, vagans; Aphis salicariae

105a Diaspididae: Chionaspis salicis

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe pulchra, tortilis; Phyllactinia corni

110 – other causers

110a Bacteria, Rhizobiaceae: Agrobacterium tumefaciens

110b Fungi, Mycosphaerellaceae: Sphaerulina cornicola

110c Fungi, Sclerotiniaceae: Cristulariella depraedans

110d Fungi, Synchytriaceae: Synchytrium aureum

110e Plantae, Santalaceae: Viscum album

It is surprising that among the miners of dogwood four species belong to two, closely related families characterised by making a blotch, ending with an excision. This is discussed in detail by Dziurzynski (1958a).

Steven IJland found in 2009 three lower-surface tentiform mines on one leaf of C. sanguinea, one with well-developed folds. The species could not be established.

25/08/2016