Arthropod and Nematode Parasites, Parasitoids, and Predators of Acrididae in America North of Mexico
- N. Rees
Impact of Rhinocyllus conicus on Thistles in Southwestern Montana
- N. Rees
- 1 December 1977
A weevil introduced into the Gallatin Valley for biocontrol of musk thistle was found to also infest 3 related species, Canada, bull, and wavy-leaved thistles.
Establishment, Dispersal, and Influence of Ceutorhynchus litura on Canada Thistle (Cirsium arvense) in the Gallatin Valley of Montana
- N. Rees
- Environmental ScienceWeed science
- 1 March 1990
Subsequent mortality rates were high for belowground Canada thistle shoots, however, the number of new shoots from underground roots the following spring usually offset the mortality that had been indi- rectly caused by C. litura.
Influence of Predators on the Efficiency of the Blaesoxipha spp. Parasites of the Migratory Grasshopper
The average longevity of adult females of three species of Blaesoxipha grasshopper parasites was estimated at 3.0 to 4.8 days under field conditions. CircumstantIal evidence suggested predation as a…
Host specificity and establishment of Aphthona flava Guill., (Chrysomelidae), a biological control agent for leafy spurge (Euphorbia esula L.) in the United States
The potential host plant range of the European flea beetle Aphthona flava, a candidate biological control agent for leafy spurge, was evaluated and fewer than 19 Euphorbia species native to the U.S. appear to be potential host plants for A. flava.
Dispersal of Rhinocyllus conicus for Biocontrol of Musk Thistle
A weevil [Rhinocyllus conicus (Froelich)] host specific to Carduus, Cirsium, Silybum, and Onopordum, was introduced into Gallatin County, Montana, for biocontrol of musk thistle (Carduus nutans L.).…
Collecting, handling, and releasing Rhinocyllus conicus, a biological control agent of musk thistle
- N. Rees
The life cycle of musk thistle and the life history and habits of the biocontrol agent Rhinocyllus conicus Froel are described and information on selecting new release sites and how to collect, handle, release, and monitor this weevil is presented.
Characterization of Rhizoctonia spp. causing disease of leafy spurge in the Northern Plains
Leafy spurge is an aggressive and persistent noxious weed that has infested millions of hectares in the Northern Plains of the United States and the Prairie Provinces of Canada since it was first reported in the United United States in 1827.
Image Analysis of Leafy Spurge (Euphorbia esula) Cover
- J. Birdsall, P. Quimby, N. Rees, T. Svejcar, B. Sowell
- Environmental ScienceWeed technology
- 1 December 1997
Estimating leafy spurge cover with a 10% error required only 20 quadrats when image analysis was used, while twice as many quadrats were needed when cover was measured ocularly, and the average error levels of image analysis and the ocular method did not differ.
First Recovery of Oberea erythrocephala on the Leafy Spurge Complex in the United States
The beetle Oberea erythrocephala, whose larvae mine stems and roots of leafy spurge (Euphorbia esula L. # EPHES), was introduced into Oregon, Montana, and Wyoming between 1980 and 1984. Although it…