Life Sciences Commons^™

The Relationship Between Male Moth Density And Female Mating Success In Invading Populations Of Lymantria Dispar, Patrick C. Tobin, Ksenia S. Onufrieva, Kevin W. Thorpe

USDA Forest Service / UNL Faculty Publications

The successful establishment of non-native species in new areas can be affected by many factors including the initial size of the founder population. Populations comprised of fewer individuals tend to be subject to stochastic forces and Allee effects (positive-density dependence), which can challenge the ability of small founder populations to establish in a new area. Although the conceptual relationship between initial colony size and establishment success has been previously documented, it is not trivial to estimate precisely the colony size needed to ensure colony persistence. Over the last 40 years, there have been many studies on the probability of mating …

A Predictive Model For Detection Of Agrilus Planipennis (Col., Buprestidae) Larvae In Girdled Ash (Fraxinus Spp.), J. M. Marshall, A. J. Storer, I. Fraser, V. C. Mastro

USDA Forest Service / UNL Faculty Publications

Agrilus planipennis (emerald ash borer, Coleoptera: Buprestidae) is a pest of ash (Fraxinus spp.) in North America and has caused mortality of ash throughout its introduced range. One technique used for detection of A. planipennis is the establishment and peeling of girdled trap trees. In an effort to reduce the search effort and target detection survey efforts within ash trap trees, a predictive model was created using data from 2007 and validated using data from 2008. In 2007 and 2008, ash trap trees were established, harvested, peeled and inspected for A. planipennis larvae. Gaussian curves were fit to describe …

Sirex Noctilio In North America: The Effect Of Stem-Injection Timing On The Attractiveness And Suitability Of Trap Trees, Kelley E. Zylstra, Kevin J. Dodds, Joseph A. Francese, Victor Mastro

USDA Forest Service / UNL Faculty Publications

1 Sirex noctilio Fabricius, an invasive woodwasp responsible for severe economic damage to pine industries in the southern hemisphere, is now established in the northeastern U.S.A. and portions of eastern Canada.

2 Parts of North America are considered to be high risk for S. noctilio invasion. Effective detection tools, including trap trees, are needed to monitor and survey S. noctilio populations.

3 The present study was conducted to determine the optimal time to chemically stress a tree when aiming to attract the most S. noctilio to the host substrate, as well as to determine which timing produced the most adult …

Survey Of Phytophagous Insects And Foliar Pathogens In China For A Biocontrol Perspective On Kudzu, Pueraria Montana Var. Lobata (Willd.) Maesen And S. Almeida (Fabaceae), Jiang-Hua Sun, Zhu-Dong Liu, Kerry O. Britton, Ping Cai, David Orr, Judith Hough-Goldstein

USDA Forest Service / UNL Faculty Publications

A three-year survey of kudzu foliage, seed, stems, and roots for associated phytophagous insects was conducted to establish basic information about the insect communities that kudzu harbors in China and to assess the abundance, diversity and damage caused by these insects. Diseases of kudzu were also surveyed in southern China. A total of 116 phytophagous insect species in 31 families and 5 orders were collected from kudzu in China, in six feeding guilds: foliage, sap, stem, terminal, seed and root feeders. The impact of foliage feeders varied from site to site and year to year, and over the course of …