Genetic variation in North American leafy spurge (<i>Euphorbia esula</i>) determined by DNA markers
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Leafy Spurge (Euphorbia esula) Genotype Affects Gall Midge (Spurgia esulae) Establishment
Greenhouse cage studies were conducted to determine the influence of shoot morphology and genetic variation on establishment of Spurgia esulae gall midge on seven leafy spurge genotypes. The genotypes were collected from South Dakota, North Dakota, Nebraska, Montana, Wyoming, Manitoba, and Austria. Genotypes from South Dakota and Nebraska were most susceptible to gall formation and had the high...
متن کاملShort-term Disruption of a Leafy Spurge (Euphorbia esula) Biocontrol Program Following Herbicide Application
Integrated pest management (IPM) for invasive plant species is being advocated by researchers and implemented by land managers, but few studies have evaluated the success of IPM programs in natural areas. We assessed the relative effects of components of an IPM program for leafy spurge (Euphorbia esula), an invasive plant, at Theodore Roosevelt National Park, North Dakota. Effects of herbicides...
متن کاملSheep preference for leafy spurge from Idaho and North Dakota
Three trials were conducted to determine if low ingestion of some leafy spurge (Euphorbia esula L.) by sheep is primarily due to differences in sheep or in leafy spurge. In the first trial, pastures in Idaho and North Dakota were grazed by sheep originating from both states. Generally, sheep from both states grazed the leafy spurge growing in the Idaho pastures reluctantly but grazed the leafy ...
متن کاملIntegrating Data, Biology, and Decision Models for Invasive Species Management: Application to Leafy Spurge (<i>Euphorbia esula</i>)
Invasive species are a major cause of environmental change and are often costly to control. Decision theory should offer managers guidance to formulate the optimal allocation of resources. Unfortunately, current decision theory models typically do not consider invasion dynamics and do not make full use of the best models of biological spread and best biological data from theoretical models. We ...
متن کاملLong-Term Dynamics of Leafy Spurge (Euphorbia esula) and its Biocontrol Agent, Flea Beetles in the Genus Aphthona
Three flea beetle species (Aphthona spp.), first introduced into North America in 1988, have come to be regarded as effective biological control organisms for leafy spurge (Euphorbia esula). The black flea beetles (Aphthona lacertosa and A. czwalinae) in particular have been shown to cause reductions in leafy spurge stem counts in the northern Great Plains, while the brown flea beetle (A. nigri...
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