Xylella fastidiosa Wells et al. (Xanthomonadales: Xanthomonadaceae) is a xylem inhabiting bacterium which is exclusively transmitted by xylem sap feeding insects. Among them, Philaenus spumarius Linnaeus and Neophilaenus campestris Fallén are the most abundant species in Europe. During 2018 and 2019 a survey was conducted in olive groves in Greece aimed to improve the knowledge about the biology and ecology of those spittlebugs in areas with Mediterranean climate. Moreover, the host preference of the nymphs was studied. The nymphs of P. spumarius and N. campestris were observed between early March and middle May depending on geographic location and year. The spittlebug adults were present during two periods every year, one in spring and another one in autumn and early winter. During summer months the spittlebugs were totally absent from olive groves. Our observation on host plant selection revealed that there was a strong preference of N. campestris nymphs for plants belonging to the family Poaceae. On the contrary, P. spumarius nymphs were polyphagous. The most preferable plants for the nymphs of this species belonged to the families Asteraceae and Fabaceae. The importance of these findings for control measures for these spittlebugs is discussed.

中文翻译：

---

希腊橄榄树林中 Philaenus spumarius 和 Neophilaenus campestris (Hemiptera: Aphrophoridae) 的季节性出现、丰度和寄主偏好

Xylella fastidiosa Wells 等人。（Xanthomonadales：Xanthomonadaceae）是一种木质部寄生细菌，仅由木质部汁液摄食昆虫传播。其中，Philaenus spumarius Linnaeus和Neophilaenus campestris Fallén是欧洲最丰富的物种。2018 年和 2019 年期间，在希腊的橄榄树林中进行了一项调查，旨在提高对地中海气候地区那些臭虫的生物学和生态学的了解。此外，研究了若虫的宿主偏好。根据地理位置和年份，在 3 月上旬至 5 月中旬期间观察到 P. spumarius 和 N. campestris 的若虫。每年有两个时期出现臭虫成虫，一个在春季，另一个在秋季和初冬。在夏季的几个月里，橄榄园中完全没有唾液虫。我们对寄主植物选择的观察表明，油菜若虫对禾本科植物有强烈的偏好。相反， P. spumarius 若虫是多食性的。该物种若虫最优选的植物属于菊科和豆科。讨论了这些发现对这些臭虫的控制措施的重要性。