Invasive Species Compendium

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Abstract

On the presence of Thecodiplosis brachyntera (Schwagr.) in pinewoods of the central and eastern Alps (Diptera, Cecidomyiidae).

Abstract

Thecodiplosis brachyntera (Schwaeg.), of which periodic outbreaks occur on pines in Europe [cf. RAE/A 62, 1548], causing shortening of the needles, is recorded for the first time south of the Alpine watershed. In 1970-73, this Cecidomyiid was found in 11 localities in northern Italy (two near Trento, one near the river Cellina and the rest in the foothills near the frontier in the extreme north-east), all of which are shown on a map. The trees attacked were Pinus sylvestris (Scots pine), P. nigra and P. mugo. A high rate of external parasitism of the larvae by two unidentified species of Hymenoptera (the common one being probably a species of Tetrastichus) was observed in the eastern localities.