Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Role of Cinara (Cupressobium) cupressi (Buckton) and other sap-sucking insects in the decay of the common cypress (Cupressus sempervirens L.).

Abstract

After twenty years, in the late spring of 1997, a sudden outbreak of the cypress aphid Cinara (C.) cupressi has again affected cypress trees in Tuscany, mainly in urban and suburban areas. In the new outbreak phase C. cupressi completed 12 generations of parthenogenetic apterous viviparous females in the full year, with alatae appearing twice, from May to July and from September until the middle of November. Cypress trees were reddened and withered in their crowns by the aphid attacks so that many of them died. Some differences between the possible causes producing the two 20-year spaced aphid outbreaks are discussed and suggestions are made in order to prevent them and to protect best the green cypress communities of Tuscany. In this regard it is emphasized that trees with reddened foliage need not be cut before the following vegetative season as some may become green again. Among other sap-sucking insects injurious to cypresses, the armored scales Carulaspis carueli and C. juniperi are mentioned, as well as the mealybug Planococcus vovae which can feed also on junipers. The heteroptera Orsillus depressus and O. maculatus frequently attack the cypress cones. Finally, the spittlebug Haematoloma dorsatum is regarded as injurious too in favourable conditions.