Plant resistance in rose cultivars to Frankliniella occidentalis: a commercial test | [Résistance à Frankliniella occidentalis chez les variétés de rosiers: un test commercial]
1999
Suetterlin, S. ((Nederlandse Algemene Keuringsdienst voor Bloemisterij-en Boomkwekerijgewassen, Roelofarendsveen (Pays-Bas)))
Host plant resistance to western flower thrips, Frankliniella occidentalis, was investigated in 20 rose cultivars. A simple test method was developed for assessing the resistance of rose cultivars in which two different parameters were recorded, (1) two types of feeding damage (silver and growth damage) on the leaves caused by thrips, and (2) the number of larvae and adult thrips in rose flowers. The feeding damage was recorded four weeks after infestation with western flower thrips and the number of thrips was counted during the whole test period in flowers that were fully open. The rose cultivars differed significantly in the amount of silver damage that was caused by feeding thrips. Growth damage was very limited in the flowering plants used and was similar among the cultivars. The number of F. occidentalis adults and the number of larvae in the rose flowers differed significantly between cultivars. However, a high number of adults on a cultivar did not imply a high number of larvae and vice versa. The silver damage on the leaves was not found to be related to the thrips population in the flowers: possible reasons for the lack of this relationship are discussed
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