| Pyralidae (Duponchelia fovealis Zeller)
Cabbage Leafroller (Clepsis spectrana Treit.)
The problematic pest Duponchelia of the pyralidae group has been seen in orchid stands for some time now. This harmful butterfly originates from Southern Europe and is mainly found in cold greenhouse cultivation and in cooled Phalaenopses. The butterfly is about 19-21 mm long, brown to brown-black with lighter coloured rings on the hind body. A characteristic is the upwardly bowed hind body. The insects usually sit on the underside of the leaves and quickly fly away when they are disturbed. The caterpillars are 2-3 cm long, the basic colour is white with many small brown spots and the head is dark. The caterpillars eat hidden, usually on the substrate surface or in the upper soil layer. Their fine webs are visible there, under which the insects are safe and the caterpillars pupate there.
The insect development in greenhouse conditions from egg to adult insect takes about 6-8 weeks with the active eating period of the larvae being 3-4 weeks and taking most of the development time.
Clepsis spectrana is a leafroller that often occurs in greenhouses in Central Europe. The butterfly is about 15-24 mm in size, ochre-coloured to yellowish with dark spots. The caterpillars are 20-25 mm long, brown to olive-green, the head is black.