Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Various damage caused by insects in 1978.

Abstract

It is reported that Dutch elm disease (caused by Ceratocystis ulmi (Ophiostoma ulmi)) broke out again on elms (Ulmus) in the Netherlands in 1978 after a respite of 50 years. In addition to the main known vectors (Scolytus scolytus (F.) and S. multistriatus (Marsham)), S. pygmaeus (F.) was present in large numbers, especially in the southern part of the country. Oaks (Quercus robur) at Norg in Drenthe were found to be infested by larvae of the buprestid Agrilus pannonicus (Pill. & Mitt.). The aphid Cinara confinis (Koch) (abieticola (Kholodk.)) was fairly common on the trunks of Abies koreana in spring and autumn; in some areas the aphids entered houses. C. tujafilina (Del G.) was found on a plant of Thuja orientalis imported from Italy that was being cultivated indoors. Lichtensia viburni Sign., found on Hedera helix at Scheveningen, had not previously been recorded from the country.