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Certain arthropods feed selectively and perform better on plants and plant tissues with elevated levels of nitrogen. Yet it is a common practice to use supplemental nitrogen in the production and maintenance of woody landscape plants. The link between elevated nitrogen levels and improved performance of herbivorous arthropods is particularly strong for sap suckers in the order Heteroptera, the majority of which are phloem feeders. There have been no studies to date on the effects of fertilization of woody plants on important mesophyll-feeding Heteroptera, such as azalea lace bug. We examined the relationship between the movement and injury of azalea lace bug and levels of fertilization of azaleas. The objective of this study was to determine if this insect responded to supplemental nitrogen fertilization in a way similar to many phloem-feeding Heteroptera and mesophyll-feeding Acarina. In these taxa, numerous studies documented improved performance and increased host plant injury as a result of supplemental nitrogen fertilization. We measured injury and colonization by azalea lace bug of azaleas receiving four levels of nitrogen fertilization. Plants with elevated nitrogen levels were preferentially chosen by azalea lace bug but did not exhibit greater levels of leaf injury.

Effect of Supplemental Nitrogen Fertilization on the Movement and Injury of Azalea Lace Bug (Stephanitis pyrioides(Scott)) to Container-grown Azaleas