Invasive plants are often released from herbivore pressure in their secondary range, but native herbivores can adapt to feed on them over time. Impatiens glandulifera and I. parviflora are two invasive species, whose leaves in the secondary range have been severely damaged by leaf miners in recent years. The leaf miner attack rates for these species and a native congener, I. noli-tangere, were examined. Molecular analysis shows that all three impatiens species are affected by the same leaf miner Phytoliriomyza melampyga (Agromyzidae) without signs of divergence between populations living on different plant species. The native I. noli-tangere is more often damaged by the leaf miner, whilst I. parviflora is attacked more often than I. glandulifera. The largest mined area was found in I. glandulifera leaves and the smallest in I. noli-tangere. The nitrogen content, indicative of food quality, was similar in all three species, and there were no differences in ¹⁵N enrichment between miners from three impatiens species. We suppose that observed differences in attack rates and mined area in P. melampyga on three Impatiens species can be explained mainly by different levels of antiherbivore defence and recent host shift from native species to invasive ones.

入侵植物通常会在其次生范围内摆脱食草动物的压力，但随着时间的推移，本地食草动物可以适应以它们为食。凤仙花和小花凤仙花是两种入侵物种，其次生范围内的叶子近年来受到潜叶蛾的严重损害。对这些物种和本地同类I. noli-tangere 的潜叶虫攻击率进行了检查。分子分析表明，所有三种凤仙花均受到同一种潜叶蝇Phytoliriomyza melampyga（Agromyzidae）的影响，但生活在不同植物物种上的种群之间没有差异的迹象。本地I. noli-tangere更容易受到潜叶蝇的损害，而I. parviflora比I. mudulifera更容易受到攻击。最大的雷区位于I. mudulifera leaves 处，最小的雷区位于I. noli-tangere处。^{代表食物质量的氮含量在所有三个物种中相似，并且来自三个凤仙花物种的矿工之间的15} N 富集没有差异。我们认为，观察到的P. melampyga对三种凤仙花物种的攻击率和雷区差异主要可以通过不同水平的反草食动物防御和最近宿主从本地物种向入侵物种的转变来解释。