Craig R. Baird

North American cuterebrid myiasis. Report of seventeen new infections of human beings and review of the disease.

Human infection with botfly larvae (Cuterebra species) are reported, and 54 cases are reviewed. Biologic, epidemiologic, clinical, histopathologic, and diagnostic features of North American cuterebrid myiasis are described. A cuterebrid maggot generally causes a single furuncular nodule. Most cases occur in children in the northeastern United States or the Pacific Northwest; however, exceptions are common. Most lesions of North American cuterebrid myiasis are caused by second or third instar Cuterebra maggots that appear in late August, September, and October. First instar maggots are unusual and occur in the vitreous humor or in the upper respiratory tract of patients in late spring and early summer.

Distribution of the Medically-implicated Hobo Spider (Araneae: Agelenidae) and a Benign Congener, Tegenaria duellica, in the United States and Canada

Abstract The hobo spider, Tegenaria agrestis (Walckenaer), and the related Tegenaria duellica Simon are very similar European spiders that have become well established in the northwestern United States and British Columbia. The hobo spider is considered to be medically important; T. duellica is considered harmless but is often misidentified as the hobo spider. The current distribution of the hobo spider includes southern British Columbia, Washington, Oregon, Idaho, northern Utah, the western half of Montana, western Wyoming, and two small, isolated populations in Colorado. T. duellica is found mostly west of the Cascade and Coastal mountain ranges from southern British Columbia to central Oregon. In large human population centers where both species are sympatric, T. duellica is usually more common than the hobo spider. Data from a total of 1,232 hobo spiders and 395 T. duellica are included in this study.

RANGE EXPANSION OF THE HOBO SPIDER, TEGENARIA AGRESTIS, IN THE NORTHWESTERN UNITED STATES (ARANEAE, AGELENIDAE)

Abstract The hobo spider, Tegenaria agrestis (Walckenaer 1802), was accidentally introduced into the United States probably in Seattle, Washington during the early 1900s and gradually spread through Washington, Oregon, Idaho and into southern British Columbia during the 20th Century. Concurrent with the expansion in range, there have been reports of necrosis in humans allegedly caused by bites from Loxosceles reclusa Gertsch & Mulaik 1940 (which does not occur in the Pacific Northwestern U.S or Canada) or T. agrestis. The geographic range of T. agrestis now extends into Montana, Utah, Nevada and most recently, central and southwestern Wyoming.

Susceptibility of hop to Phorodon humuli

A portion of the USDA World Hop (Humulus lupulus L.) Germ Plasm Collection was screened for antibiosis to the hop aphid, Phorodon humuli (Shrank). Hop aphid development and reproduction on the retained accessions 58016, 21090M, 21211, 21240, and 60038 were then compared to hop aphids reared on the commercial hop cultivars (cvs) L‐8, Perle, Chinook, Galena, Eroica, Willamette, and Cascade. In general, hop aphids matured faster and reproduced more on the commercial cvs than on 21090M, 58016, 21211, or 21240. Accession 60038, of note because it supported unusually high numbers of aphids during screening, was found to be the most susceptible of any hop tested. Mortality and natality schedules were then combined to construct matrix models of aphid population growth on 60038, 58016, Cascade, and Perle (the most and least susceptible noncommercial and commercial hops, respectively). Beginning with one one‐day‐old nymph per leaf, the models predicted that P. humuli would require 24 days to surpass an action threshold of 100 aphids per leaf on 58016. This was seven days longer than on the susceptible Cascade and five days longer than on Perle. A commercial hop with the antibiosis of 58016 would probably require fewer insecticide applications during the growing season, thus retarding the development of insecticide resistance in P. humuli and enhancing the effectiveness of integrated management programs by protecting beneficial insects.

Scientific Notes: Use of Heterorhabditid and Steinernematid Nematodes to Control Black Vine Weevils in Hop

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