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  • Author or Editor: G. Vierbergen x
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Thysanoptera species are recorded as new for the Dutch fauna: Aeolothripidae: Aeolothrips fasciatus, Thripidae: Stenchaetothrips biformis s.s., Dendrothrips degeeri, Mycterothrips annulicornis, Mycterothrips salicis, Odontothrips ignobilis, Oxythrips ulmifoliorum, Neohydatothrips gracilicornis, Thrips origani, and Phlaeothripidae: Bolothrips icarus, Haplothrips setiger. These species are known to occur elsewhere in Europe. Stenchaetothrips biformis is suspected to consist of two species: S. biformis s.s. and possibly S. oryzae. S. biformis s.s. is recorded here for the first time for Germany. Thrips inopinatus and T. fallaciosus are synonymized with  T. roepkei, which was described after a monstruose female-type specimen. Hoplothrips arnoudi is considered a junior synonym of H. pedicularius.

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The Dutch Plant Protection Service daily receives samples with insect specimens from imported end products like cut flowers and vegetables. A quick and adequate diagnosis of the intercepted specimens is required to hinder trade as little as possible. At the inspection locations dispersed over The Netherlands trained inspectors are allowed to take the decision for release or hold up of any consignment under official control, so-called first-line diagnosis. Depending on the species identity, a consignment will be subsequently released or rejected, the latter after second-line diagnosis of a quarantine or otherwise regulated pest. An additional list of 63 species intercepted in The Netherlands, partly as a result of selective first-line diagnosis, is given. After risk analysis, Ceratothripoides brunneus, Frankliniella bispinosa and Retithrips syriacus were placed under phytosanitary supervision. At present 219 species have been intercepted, with 54 species not identified to species level.

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Authors: Liliana Vasiliu-Oromulu, Daniela Bărbuceanu and G. Vierbergen

In 2010 on the green roof of the Institute of Biology in Bucharest at a height of 15 meters above ground level 607 Thysanoptera specimens were collected. Altogether 15 species were found to occur mostly in the flowers of a variety of plants in the herbaceous layer, but also some were shaken from small shrubs and trees (Rosa canina and Populus sp.). The temporal dynamics of the thrips populations in this spontaneous vegetation show a peak in the beginning of June, with a slightly descending curve to autumn. Haplothrips leucanthemi, with a consistently high numerical abundance throughout the study, is considered to be a sensitive bio-indicator of the colonisation and naturalisation of this semi-isolated urban biotope.

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Morphological identification of larvae and adults of the EU quarantine pest Thrips palmi is one of the routine procedures of the National Reference Laboratory (NRL) of the Dutch Plant Protection Service. The quality of a morphological identification depends on several technical requirements, most important of which are laboratory facilities, literature, reference collection, quality of the available specimen(s) and skills of the specialist. To be able to consistently produce valid identification results, the NRL has implemented a documented quality management system within the laboratory since 2007. ISO/IEC 17025 is used to demonstrate our competence on Thrips palmi identification under a fixed scope, “Morphological identification of T. palmi adults”. The EPPO PM 7/98 guidance for entomology sets specific requirements for this process to enable the validation of morphological identification of T. palmi adults. It is concluded that of the requirements “selectivity” can be applicable for T. palmi samples and “repeatability” is very difficult to measure for the lack of fresh samples with look-alikes. T. palmi is a well-defined species, but for species which are taxonomically “in disdussion” this guidance cannot be used and validation is not an option. The validity of identifications in entomology should be focused more on confirmation of identifications instead on the validity of a work instruction.

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By the sampling on chickweed ( Stellaria media ) carried out from autumn till the end of spring, the occurrence of the larvae of 12 Thysanoptera species has been established under climatic conditions in Hungary. Only the larvae of T. atratus and T. tabaci were present in this period in relatively high number. Since chickweed is frequently infested by Tomato spotted wilt virus (TSWV) the continuous presence of the larvae of T. tabaci in the whole period is a notable circumstance. This relationship is one of the significant ways of the survival of tomato spotted wilt virus which might be a source of new epidemics.

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