X hits on this document

PDF document

Colorado Exotic Insect Detection and Identification Fact Sheet Series - page 4 / 5

14 views

0 shares

0 downloads

0 comments

4 / 5

Urocerus cressoni. Urocerus cressoni looks similar to European woodwasp in general body shape and size. However, unlike the entirely metallic blue/black bodies of the European woodwasp, U. cressoni females have black head and thorax and a red or yellow-red abdomen. Another difference can be found in the antennal color. U. cressoni females have white tipped antennae while the antennae of the European woodwasp are entirely black. Urocerus gigas flavicornis. Urocerus gigas flavicornis can also be separated from the European woodwasp by examining body and antennae color. The body of U. gigas flavicornis females is generally black in color, but in many cases the abdomen will have yellow bands. This contrasts the entirely blue/black body of female European woodwasps. A second feature that will help separate the two wasps is the color of the antennae. U. gigas flavicornis females have yellow antennae while the antennae of the European woodwasp are black. Xeris morrisoni indecisus. Xeris morrisoni indecisus closely resembles the European wood wasp in body size and color. However they can be easily separated by taking a look at the ovipositor. The ovipositor of X. morrisoni indecisus females is nearly ¾ the length of the body while the ovipositor of the European woodwasp is generally very short (c.a. ¼ the length of the body). Xeris morrisoni Morrisoni. Xeris morrisoni morrisoni can be distinguished from the European woodwasp by taking a look at the ovipositor. The ovipositor of X. morrisoni morrisoni females is nearly ¾ the length of the body while the ovipositor of the European woodwasp is generally very short (c.a. ¼ the length of the body). Another characteristic that may separate X. morrisoni morrisoni from the European woodwasp is the color of the abdomen. X. morrisoni morrisoni females generally have red abdomens while the abdomen of female European woodwasps is generally metallic blue/black entirely. Xeris spectrum spectrum. Xeris spectrum spectrum closely resembles the European wood wasp in body shape and color. Much like the other Xeris species discussed X. spectrum spectrum can be distinguished from the European woodwasp by taking a look at the ovipositor. The ovipositor of X. spectrum spectrum females is nearly ¾ the length of the body while the ovipositor of the European woodwasp is generally very short (c.a. ¼ the length of the body). Figure 9. Urocerus cressoni (female). Photo courtesy of Kenneth Law Figure 10. Urocerus gigas flavicornis (female). Photo courtesy of David Leatherman

There remain three Sirex species already present in Colorado that so closely resemble the European woodwasp that species determination must be done by an expert: Sirex areolatus. Sirex areolatus resembles the European wood wasp in body, shape and length. S. areolatus may be separated from the European wood wasp by checking leg color as it has blue-black legs; European wood wasp has orange-yellow legs. The ovipositor is also longer than that of a European wood wasp. Common hosts include various pines, Douglas-fir, and juniper. Sirex juvencus californicus. Sirex juvencus californicus closely resembles the European wood wasp. Females are metallic blue black with blue-black legs and a short ovipositor.

Document info
Document views14
Page views14
Page last viewedFri Dec 02 18:51:26 UTC 2016
Pages5
Paragraphs28
Words1889

Comments