Search Results

Jianfeng Gu, Natsumi Kanzaki and Marek Tomalak

Jianfeng Gu, Marek Tomalak, Jie He and Yiwu Fang

New morphological, molecular and bionomic data are added to update the description of Bursaphelenchus crenati. The nematode was isolated from larval galleries and adults of the Greater ash bark beetle, Hylesinus crenatus Fabricius, present in bark of older trees of European ash, Fraxinus excelsior L., in Poland. Detailed female and male morphology are documented in this paper and compared with the original description. From ITS1/2, partial 28S D2-D3 and partial 18S sequences, ITS-RFLP patterns and morphological analysis, B. crenati is suggested to be temporarily placed into the sexdentati group, close to B. andrassyi, B. vallesianus, B. sexdentati, B. pinophilus, B. poligraphi, B. fuchsi, B. incurvus, B. piniperdae, and B. pityogeni. However, B. crenati can be distinguished from these species by the strongly ventrally curved body and the presence of three incisures in the lateral fields.

Marek Tomalak, Tadeusz Malewski, Jianfeng Gu and Zhan Fa-Qiang

Bursaphelenchus taphrorychi sp. n. is described from the bark of European beech, Fagus sylvatica. All propagative stages of the nematode are numerous in larval galleries of the beech bark beetle, Taphrorychus bicolor, while dauer juveniles are transmitted to new breeding trees under the elytra of adult beetles. The new species is characterised by the body length of 782 (717-858) μm in female and 638 (475-789) μm in male, moderately slender body (a = 35.0 (31.7-36.5) and 35.5 (31.4-37.1) in female and male, respectively), spicules 12.0-16.0 μm long, lateral fields with four incisures (i.e., three bands), and the arrangement of the seven male caudal papillae (i.e., a single precloacal ventromedian papilla (P1), one pair of adcloacal ventrosublateral papillae (P2), one postcloacal pair (P3) located at ca 60% of the tail length, posterior to the cloacal aperture, and one pair (P4) of subventral papillae of a similar size as the previous pair, but with somewhat sunken tips, located near base of bursa). In the number and arrangement of caudal papillae, stout and curved spicules with prominent rostrum and condylus, small vulval flap, body narrowed posterior to vulva, four incisures in the lateral fields, and long post-uterine sac, B. taphrorychi sp. n. shares most of the key morphological characters with members of the sexdentati-group. However, the newly described species is unique amongst Bursaphelenchus species of this group by the combination of shape of female tail, shape of spicules, and some other morphometric characters. The close relation of B. taphrorychi sp. n. with members of the sexdentati-group has been confirmed by DNA sequencing and phylogenetic analysis of the 28S rDNA region. The taxonomic separation of the new species is also confirmed by the unique molecular profile of the ITS region (ITS-RFLP). In laboratory rearing, B. taphrorychi sp. n. can develop and reproduce on Botrytis cinerea cultures.

Munawar Maria, Jianfeng Gu, Marek Tomalak, Yiwu Fang and Hongmei Li

Ruehmaphelenchus quercophilus n. sp., isolated from a dying oak, Quercus robur, in the State Forests, Łopuchówko District, Poland, is described and figured. It is characterised by three lateral lines, relatively stout body, excretory pore posterior to nerve ring, five caudal papillae, spicules relatively small (12-14 μm) with weakly developed condylus and rostrum, bursa absent, vulva positioned at ca 78% of body length, vulval flap absent, post-uterine branch extending for slightly over half of vulva to anus distance, and conoid tail with a bend at the distal end forming a terminal projection 10-14 μm long. The new species is very similar to four other described species, namely R. formosanus, R. juliae, R. thailandae, and R. sirisus. Detailed phylogenetic analysis based on 18S, 28S D2-D3 and ITS sequences has confirmed the status of this nematode as a new species.

Jianfeng Gu, Marek Tomalak, Helen Braasch and Yiwu Fang

Summary

New morphological, molecular and bionomic data are added to update the description of Bursaphelenchus eucarpus. The nematode was isolated from larval galleries and adults of the apple bark beetle, Scolytus mali, and the shothole borer, S. rugulosus, present under the bark of the bird cherry, Prunus padus, and the common European plum, P. domestica, in Poland. Detailed male, female and dispersal juvenile morphology and morphometrics are documented and compared with the original description. From partial 18S, ITS1/2 and partial 28S D2-D3 sequences and morphological features (three lateral lines, position of caudal papillae, shape of the delicate spicules with dorsally bent condylus, lack of vulval flap, a long post-uterine branch and a hyaline region at the female tail tip) it can be concluded that B. eucarpus belongs to the eremus group of Bursaphelenchus. The differentiation from related species of the eremus group is discussed.