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Thrips setosus

Thrips setosus (Thysanoptera: Thripidae)

 

Why: The presence of Thrips setosus has recently been reported by the Netherlands on Hydrangea plants. Following this initial record, other European countries also found the pest. T. setosus is a polyphagous species which can transmit Tomato spotted wilt virus (Tospovirus, TSWV – EPPO A2 List). Because this was the first time that this potentially damaging thrips species was reported in the EPPO region, the EPPO Secretariat decided to add it to the EPPO Alert List.

Where: Until recently, T. setosus was only known to occur in parts of the Asia.
EPPO region: Croatia, France, Germany, Netherlands, United Kingdom. The pest was first found in autumn 2014 in the Netherlands in one production site of Hydrangea plants for planting grown indoors and outdoors. Subsequent surveys detected the pest in other Dutch production sites and in other European countries. No specific official measures have been taken in countries concerned.
Asia: Indonesia (Sumatra), Japan (widespread), Korea (Republic of).

Courtesy: Wietse den Hartog (NPPO of NL)
Hydrangea plants showing some leaf damage

On which plants: T. setosus is a highly polyphagous species. In Japan, it has been found on many plant species including crops [e.g. Capsicum annuum (sweet pepper), Cucumis sativus (cucumber), Cucurbita moschata (pumpkin), Dioscorea japonica (Japanese mountain yam), Momordica charantia (bitter gourd), Nicotiana tabacum (tobacco), Pisum sativum (pea), Sesamum (sesame), Solanum lycopersicum (tomato), Solanum melongena (aubergine), Solanum tuberosum (potato), Vicia sativa subsp. angustifolia (narrow leaf vetch)], ornamental plants [e.g. Abelia spathulata, Brassica olearacea var. acephala (ornamental cabbage), Chrysanthemum morifolium, Dahlia, Hippeastrum, Iris, Liriope platyphylla, Oenothera, Ophiopogon jaburan, Tagetes], weeds and wild plants [Ailanthus altissima, Cirsium japonicum, Lamium amplexicaule, Polygonum, Pueraria lobata]. In the Republic of Korea, it was reported on rice (Oryza sativa). In Japan, it is considered to be a pest of tobacco (Nicotiana tabacum) and tomato (Solanum lycopersicum). In European countries, T. setosus was found on Hydrangea plants, as well as on several weeds (e.g. Heracleum sphondylium, Lamium purpureum, Urtica dioica) growing in their vicinity.

Damage: T. setosus feeds on leaves but not on pollen. Damage is typical of leaf-feeding thrips (silvery spots with dark punctures on the foliage). In the Netherlands, feeding damage was also observed on the sepals of Hydrangea flowers. T. setosus has been shown to be a vector of TSWV, a virus which has a very large host range, including economically important vegetable and ornamental crops.

Dissemination: The potential of T. setosus for natural spread is relatively limited. Over long distances, the international trade of plants for planting is probably the main pathway.

Courtesy: Wietse den Hartog (NPPO of NL)
Adult and excrements on a leaf (top)
Feeding damage on flowers (bottom)

Pathway: Plants for planting, cut flowers and foliage, fruit and vegetables, soil and growing media.

Possible risks: Information is generally lacking on the biology, distribution and economic impact of T. setosus. In the available literature, there is no indication that T. setosus is causing severe direct or indirect damage in its area of origin. However, studies carried out in Japan have shown that T. setosus has a fast development, high fecundity and high potential for population increase. These studies also concluded that the broad host plant range, high population growth rate, and virus transmission ability would have the potential to make T. setosus an important pest, in particular in glasshouse crops. As is the case for other thrips species, due to its small size and high rates of reproduction, T. setosus is likely to be difficult to detect and control. Finally, considering the impacts of earlier introductions of thrips species such as Frankliniella occidentalis, as direct plant feeders and virus vectors, it seems desirable to prevent any further spread of T. setosus in the EPPO region.

Sources
INTERNET
National Plant Protection Organization, the Netherlands. Quick scan (QS. Ent.2014.11 – dated 2014-10-17) http://www.nvwa.nl/txmpub/files/?p_file_id=2207523
Johari A (2015) The diversity of Thrips sp. (Thysanoptera: Thripidae) in chili plantation (Capsicum annuum L.) in the region of Jambi. Indian Journal of Scientific Research and Technology 3(1), 65-70.

Kurosawa M (1957) On Thysanoptera from Sikoku with description of a new species. Botyu-Kagaku 22, 94-97.
NPPO of Croatia (2016-10).
NPPO of France (2016-11).
NPPO of Germany (2016-10, 2017-07).
NPPO of the Netherlands (2014-10, 2015-05).
NPPO of the United Kingdom (2016-11).
Mizobuchi M, Fujiwara Y (1991) [Notes on thrips (Thysanoptera) collected in and around ports of Kobe, Himeji, Uno and Hiraeo]. Research Bulletin of the Plant Protection Service Japan no. 27, 115-157 (in Japanese).
Murai T (2001) Life history study of Thrips setosus. Entomologia Experimentalis et Applicata 100, 245-251.
Woo KS, Kwon OK, Cho KS (1991) Studies on the distribution, host plants and taxonomy of Korean thrips (Insecta: Thysanoptera). Seoul National University. Journal of Agricultural Sciences 16(2), 133-148 (abst.).
Ohnishi J, Knight LM, Hosokawa D, Fujisawa I, Tsuda S (2001) Replication of Tomato spotted wilt virus after ingestion by adult Thrips setosus is restricted to midgut epithelial cells. Phytopathology 91, 1149-1155.
Reitz SR, Gao YL, Lei ZR (2011) Thrips: pests of concern to China and the United States. Agricultural Sciences in China 10(6), 867-892.

EPPO RS 2014/181, 2015/109, 2016/004, 2017/009, 2017/010, 2017/011, 2017/012, 2017/157

Panel review date 2017-03
Entry date 2014-10

 

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