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  • Author or Editor: L. Milevoj x
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The gladiolus thrips (Thrips simplex) is a common pest of gladioli. The insect causes damage to leaves, flower stalks and buds by sucking. The present study was intended to investigate the susceptibility of four Gladiolus cultivars as well as the colour preference of the thrips tested on different coloured flowers of the cultivars. The experiment was carried out in 2006 at two locations in central Slovenia. After planting the corms on April, 27 and May, 2 on three occasions with successive plant stages the percentage of infested foliage surface and flowers was assessed. Of the cultivars tested, the ‘Nova Lux’ was the only cultivar suited for cultivation without insecticide application. The flowers of gladioli with a light colour (white ‘White Prosperity’, yellow ‘Nova Lux’) were less infested in comparison with cultivars with dark coloured flowers (orange ‘Hunting Song’, red ‘Oscar’).

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In 2001 Echinothrips americanus Morgan was first recorded in Slovenia. The thrips was first recorded in Europe in 1989, but did not begin to spread to a greater extend until 1993. This polyphagous pest is believed to cause direct damage, especially on the leaves of its host plants. The present contribution describes genetic structure of Echinothrips americanus Morgan rooting in polymorphism of the ITS1-5,8S-ITS2 region of the ribosomal DNA. Echinothrips americanus Morgan is less resistant to insecticides and its ability to inhabit new areas is smaller, compared to the Western flower thrips [Frankliniella occidentalis (Pergande)]. It can be concluded that its economic importance in the future will not reach that of the latter. We gave a detailed description of the species, its geographic distribution, and deal with its host plants as well as bionomics and its potential natural enemies.

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