Plant signals during beetle (Scolytus multistriatus) feeding in American elm (Ulmus americana Planch)

Semiochemical-mediated flight strategies of two invasive elm bark beetles: a potential factor in competitive displacement.

A seven-state survey showed that the recently detected invasive Asian banded elm bark beetle, Scolytus schevyrewi Semenov, was abundant in areas of Colorado and Wyoming, whereas the long-established European elm bark beetle, S. multistriatus (Marsham), was not as abundant. In one of a series of studies to evaluate whether S. schevyrewi is competitively displacing S. multistriatus in their North...

Statistical Correlations Between GLC Assay and Smaller European Elm Bark Beetle1 Bioassay2

American elm trees, Ulmus americana L., were sprayed with methoxychlor by helicopter or mist blower, and twig crotches were collected from sprayed trees for bio­ assay of Scolytus multistriatus (Marsham) and GLC as­ say. Correlations established between the 2 assays were Dutch elm disease, caused by the fungus Cerato­ cystis ulmi (Buisman) C. Moreau, is a serious shade tree problem in the Unite...

Exotic Invasive Elm Bark Beetle, Scolytus kirschii, Detected in South Africa

Characterization of two non-native invasive bark beetles, Scolytus schevyrewi and Scolytus multistriatus (Coleoptera: Curculionidae: Scolytinae)

Scolytus schevyrewi Semenov, the banded elm bark beetle, and S. multistriatus Marsham, the smaller European elm bark beetle, are morphologically similar. Reliance on adult external morphological characters for identification can be problematic because of wide withinspecies variability and the need for good-quality specimens. The inability to identify developmental stages can also hamper early-d...

Influence of a Ceratocystis ulmi Toxin on Water Relations of Elm (Ulmus americana).

Water-soluble glycopeptides isolated from cultures of Ceratocystis ulmi have been reported to be toxins involved in Dutch elm disease. The influence of the glycopeptides on the water relations of Ulmus americana seedlings was tested by placing cut stems in glycopeptide preparations. After 4 hours in 200 micrograms per milliliter toxin the stem conductance of the seedlings was reduced by 79% and...