Abstract
Studies concerning the effect of the feeding of aphids <i>Macrosiphum rosae</i> (L.) and <i>Chaetosiphon tetrarhodus</i> (Walk.) on the flowering of roses were carried out in four sites in the green area of Lublin in the years 2001-2003. The studies comprised the shrubs of the park rose 'Grandhotel', the Rugosa rose, the multiflorous rose and the flower-bed roses of various cultivars. Aphids <i>Ch. tetrarhodus</i> dominated on Rugosa rose, while <i>M. rosae</i> dominated on the other roses. Aphids <i>M. rosae</i> and <i>Ch. tetrarhodus</i>, when found in greater numbers, caused deformation of the leaf blades, the shortening of shoots and petioles, as well as deformation of the flowers.
Highlights
Roses are the shrubs of exceptionally decorative character, especially at during the flowering period
The studies concerning the effect of the feeding of aphids Macrosiphum rosae (L.) and Chaetosiphon tetrarhodus (Walk.) on the flowering of roses were conducted in the green area of the Lublin city in the years 2001-2003
Similar results were achieved on multiflorous roses and the flower-bed roses, where M. rosae was the dominating species
Summary
Roses are the shrubs of exceptionally decorative character, especially at during the flowering period. A lot of species are cultivated because of the shrub habit, effective colouring of the leaves in summer in utumn and the their decorative fruit and thorns (B u g a 3 a , 2000; Seneta and Dolatowski , 2003). Thousands of cultivars are known whose flowers are often big, full and they smell nice, and besides, the noble roses usually repeat their flowering (Gottschalk , 1991). The massive occurrence of a number of aphid species that take their food from the fibre-vascular bundles and the parenchyma can cause considerable injuries on roses. The colonized plants have small increases, they lose their leaves earlier, flower poorly and besides, they are covered with honey-dew which lowers the decorative nature of the plants
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