Twig Feeding by the Smaller European Elm Bark Beetle on Different Kinds of Trees1

Abstract

Compared with the number of cambial punctures chewed by the smaller European elm bark beetle, Scolytus multistriatus (Marsham), on cut twigs of American elm, Ulmus americana L., in a series of twig-feeding tests conducted under variable temperature conditions in laboratory, there was relatively little to no significant increase or decrease in the number of such punctures on the following trees: Siberian elm, Ulmus pumila L.; Vanhoutte' English elm, U. procera Vanhouttei (Schelle) Rehd.; Japanese elm, U. japonica (Rehd.) Sarg.; Buisman selection smoothleaved elm, U. carpinifolia Gleditsch; Augustine ascending elm, U. americana ascendens Slavin F.; slippery elm, U. fulva Micheux; or on Japanese zelkova, Zelkova serrata (Thunb.) Mak. On David hemiptelea, Hemiptelea Davidii (Hance) Planch., there were significantly fewer cambial punctures while on native hackberry, Celtis occidentalis L., and white oak, Quercus alba L., no such punctures occurred.