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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