BYGL Bug Bytes April 24, 2008 EFFECTIVE BAITS AND SCOLYTINE BEETLE DIVERSITY REVEALED
| EFFECTIVE BAITS AND SCOLYTINE BEETLE DIVERSITY REVEALED |
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 Bark and ambrosia beetles (family Scolytidae) have the potential to cause serious harm to trees in landscapes and nursery production. Knowing which species are present and how to monitor for them is important to mounting an effective pest management strategy. Scolytine species diversity in northeast Ohio as well as effective monitoring methods were revealed by a rigorous survey conducted in 2007 by Dan Herms (OSU-OARDC, Entomology), Dave Nielsen (Professor Emeritus, OSU-OARDC Entomology), and Kamal Gandhi (OSU-OARDC, Entomology). The team used Lindgren funnel traps which are known to be effective with bark beetles. The traps were baited with one of three attractants to test effectiveness in luring scolytine beetles. The team surveyed five northeastern Ohio counties (Geauga, Holmes, Medina, Summit, and Wayne), and trapped beetles were sent to Anthony Cognato (Michigan State University) who did the final identifications. Following are excerpts from the report summarizing their survey results titled, "2007 Early Detection and Rapid Response Program for Scolytine Beetles in Ohio: Final Report." "During the summer of 2007, we caught a total of 6,066 scolytine beetles represented by 37 species. Xylosandrus germanus (25% of the total catch) was the most abundant beetle followed by Tomicus piniperda (15%) and Xyleborus saxeseni (3%); all three species are exotic. We captured nine scolytine species that are new state records for Ohio. These new species include the six exotic species Ambrosiodmus rubricollis, Dryoxylon onoharaensis, Euwallacea validus, Xyleborus californicus, Xyleborus pelliculosus, and Xylosandrus crassiusculus. As these exotic species are known to exist in North America, our results reflect the establishment and possibly spread of exotic scolytine species within the United States. New state records for three native species include Corthylus columbianus, Dryocoetes autographus, and Hylastes tenuis. Among the dominant scolytine species, adult female X. germanus were attracted most to semiochemical baits in May and July, indicating that there are at least two generations per year. Male and female T. piniperda were attracted most to semiochemical baits in May, indicating that there is at least one generation per year. Female X. saxeseni were attracted most to semiochemical baits in May, June, and August, indicating that there are at least three generations per year. Thanasimus dubius, the dominant clerid predator, was attracted most to semiochemical baits in April and June, and their activity coincided with that of the native scolytine, Ips pini. Xylosandrus germanus, T. piniperda, and X. saxeseni were attracted primarily to the blend of ethanol and alpha-pinene. In contrast, T. dubius and I. pini were attracted primarily to the exotic Ips lure [ipsdienol, methybutenol, and cis-verbenol]. Thus, these semiochemical baits were effective in targeting exotic beetle adults in forested and urban landscapes." For more information, see: 
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| Last Updated ( Thursday, 24 April 2008 17:01 ) |
