Dryophthorus americanus (Bedel, 1885)

Dryophthorus americanus (Bedel, 1885) View in CoL ( Dryophthoridae )

( Fig. 2A, C, E)

France

– Gironde, Biganos, 44.63052°, -0.97618°, 28. VI .2023 , Lindgren funnel trap baited with a multipheromone blend of cerambycids implemented with plant volatiles, 2 ex., INRAE-URZF leg. ( LNEF-ONF). La Teste-de-Buch, state forest, 44.50538°, -1.20122°, 13. VI .2023 , PolytrapTM baited with ethanol, 1 ex., LNEF-ONF ( LNEF-ONF) .

– Pyrénées-Atlantiques, Pontacq, 43.20157°, -0.08097°, 22.VI.2023, Crosstrap® baited with Galloprotect pack®, 2 ex., DSF leg. ( LNEF-ONF). New country record for France and first report in Europe .

Status in France. – Possibly established.

Geographical distribution. – The only representative of the genus in North America , particularly common in dead pine wood, widely distributed in the United States ( O’Brian, 1997),

A. Bitoma siccana (Pascoe, 1863) ( 2.7 mm). B. Europs sp. ( 2.7 mm). C -D. Stenolophus (Egadroma) quinquepustulatus (Wiedemann, 1823) (5.6 and 6.3 mm).

mainly in the eastern part (GBIF, 2024a). Not reported in Europe and the whole Palearctic region ( Lyal, 2011).

Remarks. – Adults are found under the bark of old decayed trunks or in forest litter (Anderson, 2002). This species, as well as a fairly wide range of other saproxylic beetles, could very occasionally carry the pathogenic fungus Geosmithia morbida , cause of thousand cankers disease on Black Walnut ( Moore et al., 2019). However, according to these latter authors, only Pityophthorus juglandis Blackman, 1928 ( Coleoptera , Scolytinae ) is currently able of inoculating the disease. Further investigations must be carried out to prove that other potentially carrier species can really play the role of vectors. Consequently, D. americanus does not normally present any economic risk. However, a competition with native saproxylophagous relatives may occur, in particular with its Palearctic vicariant D. corticalis (Paykull, 1792) , with which it was collected in the forest of La Teste.

We can easily separate Dryophthorus americanus from the European species D. corticalis with the following key: