Progress 04/01/00 to 09/30/06
Outputs
The principal investigator has retired from Oregon State University.
Impacts
Education of mainly commercial nursery and Christmas tree growers regarding the employment of least toxic approaches to insect pest management. In recent years the project has focused on black vine weevil management (a major pest in some commercial plant nurseries). In Christmas tree production the project has focused on spider mite management with emphasis on the preservation of a predator mite species (Typhlodromus americanus).
Publications
- No publications reported this period
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Progress 01/01/03 to 12/31/03
Outputs
No major research components were completed this year. The project continues to focus on the dissemination of exisiting information to various user groups. The most relevant information pertains to managing significant insect and mites pests using the least toxic approaches. The user groups are commercial plant nurseries, commercial Christmas tree growers, golf course managers, public parks and recreation managers, homeowners, and lawn and tree care companies.
Impacts
Education of mainly commercial nursery and Christmas tree growers regarding the employment of least toxic approaches to insect pest management. In recent years the project has focused on black vine weevil management (a major pest in some commercial plant nurseries). In Christmas tree production the project has focused on spider mite management with emphasis on the preservation of a predator mite species (Typhlodromus americanus).
Publications
- DeAngelis, J.D. 2003. Revision of parts of the Urban Entomology website (http://ent.orst.edu/urban/home.html)
- DeAngelis, J.D. 2003. various factsheets and pest management bulletins
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Progress 01/01/02 to 12/31/02
Outputs
Progress was interrupted by the announced closure of the entomology department in 2002. Closure is scheduled for 6/30/03. A project (then funded by the Oregon Nurserymen Assocation) to work on black vine weevil was withdrawn because of these uncertainties. Continue to work with individual growers to encourage an integrated approach to pest management including proper pest identification and selection of least toxic materials. New knowledge along these lines is incorporated into the PNW Insect Management Handbook.
Impacts
Reduce commercial nursery, greenhouse and Christmas tree growers dependence on conventional pesticides for routine pest management.
Publications
- Pscheidt, J. W., J. D. DeAngelis. 2002 (revised). Controlling diseases and insects in home orchards. OSU EC 631, 6 pp.
- 2002(revised). PNW Insect Management Handbook. Ag. Comm., Oregon State University, 449 pp.
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Progress 01/01/01 to 12/31/01
Outputs
The overall aim of this project has been to introduce commercial growers of ornamentals to alternative and less toxic approaches to the control of insect and mite pests. The following publications were completed during 2000-2001. In addition to these hardcover publications, a website (www.ent.orst.edu/urban/home.html) was developed, in part, to distribute information to growers. New material is continually added to the site.
Impacts
Many growers will adopt less toxic approaches to pest management so long as they provide economical control of pests. The expected impact of this project is a significant increase in the use of low toxicity approaches to pest management as some growers adopt these practices and in turn influence their peers.
Publications
- Berry, R.E. and J.D. DeAngelis. 2000. Insect control on nursery and landscape plants with entomopathogens. In Field Manual of Techniques in Invertebrate Pathology. L.A. Lacey and H.K. Kaya, eds. Kluwer Academic Publishers. 932 pp.
- PNW Insect Management Handbook. (revised 2001) Ag.Comm., Oregon State University, 413 pp.
- Hoffer, M., J. Pscheidt, and J. DeAngelis. 2000. OSU EC 1520. Controlling Diseases and Aphids on Your Roses. 8 pp.
- DeAngelis, J.D. 2000. Slugs. OSU FS 277, 2pp. (revised).
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Progress 01/01/94 to 12/30/94
Outputs
ORE00349 Predator mites. The study to characterize the predator mite Typhlodromus americanus (T. exhilarates americanus (Acari: Phytoseiidae)) in terms of its potential as a biological control agent for the spruce spider mite is nearly completed with the thesis of Ms. Rene Horton (to be completed 6/95). This mite is the dominant predator mite species in conifers grown for Christmas trees in the Willamette Valley of western Oregon. Our objective has been to characterize the predator in terms of important life history parameters that might contribute to its effectiveness as a natural enemy. Sciarid fly pest management. This project deals mainly with management of a sciarid fly pest in commercial mushroom production, Lycoriella mali (Diptera: Sciaridae). The objectives are to determine factors that regulate fly migration between growing rooms. Migration is important because since growing rooms are heat pasteurized between crops, migrating flies are the only source of new
infestation. We believe migration is density-dependent and influenced by odors produced by fresh compost. This project too will likely be terminated this year with the thesis of Mr. Chris Mehalis.
Impacts
(N/A)
Publications
- PSCHEIEDT, J.W. DE ANGELIS, J. D., MORGAN, S. and REISINGER, R. 1994. Controllingdiseases and insects in home orchards. OSU EC 631, 6pp.
- DE ANGELIS, J.D., SETHER, D. M., and ROSSIGNOL, P.A. 1994. Transmission of impatiens necrotic spot virus in peppermint by western flower thrips (Thysanoptera: Thripidae). J. Econ. Entomol. 87(1):197-201.
- DE ANGELIS, J.D. 1994. Aphid and adelgid pests of conifers in Oregon. OSU EC 1444. 7pp.
- DE ANGELIS, J.D. 1994. Biology and control of Douglas-fir needle midge. OSU EC 1373.
- DE ANGELIS, J.D. and DE ANGELIS, E.A. 1994. Psyllid pests on ornamentals. OAN Digger, June, p. 32.
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Progress 01/01/93 to 12/30/93
Outputs
Predator mites. The predator mite Typhlodromus americans (T. exhilaratus americanus Acari: Phytoseiidae) is under study to determine its potential as a biological control agent for the spruce spider mite. This mite is the dominant predator mite species in conifers grown for Christmas trees in the Willamette Valley of western Oregon. Our objective is to characterize the predator in terms of important life history parameters that might contribute to its effectiveness as a natural enemy. Sciarid fly pest management. This is a new project that deals mainly with management of a sciarid fly pest in commercial mushroom production, Lycoriella mali (Diptera: Sciaridae). The objectives are to determine factors that regulate fly migration. Migration is important because since growing rooms are heat pasteurized between crops, migrating flies are the only source of new infestation. We believe migration is density-dependent and influenced by odors produced by fresh compost.
Impacts
(N/A)
Publications
- DEANGELIS, J. D. and GARTH, G. 1993. Root Weevils in the nursery & landscape. OSUES/ODA Special Publication, 4 pp.
- DEANGELIS, J. D., SETHER D.M. and ROSSIGNOL, P.A. 1993. Survival, development and reproduction in western flower thrips (Thysanoptera: Thripidae) exposed to impatiens necrotic spot virus. Environ. Entomol. 22:000-000.(In press).
- DEANGELIS, J. D. and FOLEY, M. 1993. Modified use of diflubenzuron for sciarid fly control. Mushroom News. Nov. pp. 5-7.
- WEST, K. J. and DEANGELIS, J.D. 1993. Typhlodromus americans Chant and Yoshida-Shaul, a predator of the spruce spider mite. Int. J. Acarology. 19(2):193-194.
- DEANGELIS, J. D and GARTH, G. 1993. Management of root weevils in the nursery and landscape. OAN Digger, June, pp 21, 23, 49.
- DEANGELIS, J. D. 1993. Control of black pineleaf scale in Christmas trees. Christmas Tree Lookout, Summer, p. 22.
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Progress 01/01/92 to 12/30/92
Outputs
Biological control of western flower thrips. Our work with Amblyseiius cucumeris, the principal phytoseiid predator of western flower thrips is now concerned with determining its susceptibility to commonly used greenhouse pesticides. We are especially concerned about the avermectins (Avid) as these are likely to become widely used in greenhouses for spider mite and leafminer control. Christmas tree IPM. This project deals mainly with management of spruce spider mite, Oligonychus ununguis, the primary phytophagous pest in Oregon's Christmas trees, and a species complex of needle midge on Douglas-fir. A phytoseiid predator mite, Typholdromus exhilaratus americanus, is being studied in its role in regulating spruce spider mite populations. Our goal is to design appropriate management strategies for both the spider mite and the needle midge that preserve the beneficial predator species. We have begun also a survey of the important aphid and adelgid species in Douglas-fir,
noble and grand firs in order to determine some basic life history parameters for the dominant pests in trees grown for Christmas tree sale.
Impacts
(N/A)
Publications
- SETHER, D. 1991. Transmission efficiency and life table parameters of western flower thrips, Frankliniella occidentalis (Pergande) exposed to tomato spotted wilt virus-impatiens serotype. MS. Thesis. Oregon State University, Corvallis, OR.
- SETHER, D. M. and J. D. DEANGELIS. 1992. Tomato spotted wilt virus host list and bibliography. OSU Ag. Exp. Stn. Tech. Bull. 888, 16 pp.
- WESTCOTT, R. L. and J. D. DEANGELIS. 1992. New Pest Alert - Cherry Bark Tortrix Moth. OSU EC 1407, 5 pp.
- REGAN, R. P. and J. D. DEANGELIS. 1992. Predicting flight of European pine shoot moth, OAN Digger May, pp. 25-27.
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Progress 01/01/91 to 12/30/91
Outputs
Greenhouse management of Tomato Spotted Wilt Virus (TSWV) and Western Flower Thrips (WFT): Our work on transmission of Tomato Spotted Wilt Virus (TSWV-I; impatiens strain) in greenhouses by Western Flower Thrips continues. We have reported for the first time that exposure to the virus reduces survival and reproductive potential, and prolongs larval devlopment in the vector thrips. This finding may have significant implications for control of the vector and virus. Christmas tree IPM: This project deals mainly with management of spruce spider mite (Oligonychus ununguis) and a species complex of Douglas-fir needle midge on Douglas-fir Christmas trees. The phytoseii predator mite Typhlodromus exhilaratus americanus is found in large number in plantations with a history of minimal insecticide/miticide usage. We have determined that some insecticide/miticide applications are markedly more detrimental to predator mite populations than are others. For example,
esfenvalerate was found to be 5 orders of magnitude more toxic in slide-dip assays than endosulfan. Likewise, for assays involving miticides, dicofol was several orders of magnitude more toxic than those containing fenbutatin-oxide. These data are being used in the design of an appropriate pest management program to preserve the predator complex.
Impacts
(N/A)
Publications
- SETHER, D., DEANGELIS, J.D. and ROSSIGNOL, P.A. 1991. First report of tomato spotted wilt virus in peppermint (Mentha piperita). Plant Dis. 75:644.
- REGAN, R., DEANGELIS, J.D. and GREDLER, G. 1991. Predicting Seasonal Flight of European Pine Shoot Moth (Lepidoptera: Tortricidae) in Western Oregon. Environ. Entomol. 20:1403-1406.
- DEANGELIS, J.D. 1991. Introduction to biological pest control in greenhouses. OSU Extension Circular 1376.
- GRIESBACH, J.A., ALLEN, T., FISCHER, S., DEANGELSI, J., and PSCHEIDT, J. 1991. The tomato spotted wilt virus. ODA/OSUES Special publication.
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Progress 01/01/90 to 12/30/90
Outputs
Greenhouse management of tomato spotted wilt virus (TSWV) and western flower thrips (WFT): We determined that peppermint (Mentha piperita) is an important new host for tomato spotted wilt virus. This is the first case of a field crop in Oregon showing significant infection from this thrips-vectored pathogen. Peppermint is an important commercial crop in this state. All propagation material is ultimately greenhouse-grown and thus subject to widespread infection by TSWV. We are continuing work on transmission of the virus by WFT. Christmas tree IPM: This project has concentrated on two important Douglas-fir tree pests -Douglas fir needle midge (DFNM) and spruce spider mite (SSM). Studies were conducted during 1990 to determine the seasonal life history of DFNM in the Pacific Northwest. At the same time we began to develop phenology data and gained experience trapping DFNM. Work with SSM predator mites continues. We have collected two phytoseiid predator mites from
Christmas tree plantations thus far and had their identity confirmed. Work is now underway to rear the predators so that life table and resistance studies may be done.
Impacts
(N/A)
Publications
- DEANGELES, J. 1989. Honeylocust Pod Gall Midge. Ornamentals Northwest Newsletter. 13(2):15.
- DEANGELIS, J. 1989. New Insect and Mite Pests of Conifers. Ornamentals Northwest Newsletter. 13(2):14.
- WEST, K.J. and DEANGELIS, J.D. 1990. Two new eriophyid mite pests of Christmas trees. Christmas Tree Lookout: 30-33. Winter 1990.
- WESTCOTT, R.L., FISHER, G.C. and DEANGELIS, J. 1990. Ash Whitefly. New Pest Alert. OSU Extension and Oregon Dept. of Agric. EC 1362.
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Progress 01/01/89 to 12/30/89
Outputs
Greenhouse management of Western flower thrips. Studies were conducted during May-August, 1989 in two commercial greenhouses in the Willamette Valley, OR, to determine the efficacy of different colored sticky card traps for monitoring Western flower thrips (Frankliniella occidentalis). The Western flower thrips has recently gained increased importance as a greenhouse pest because of its status as a vector of tomato spotted wilt virus. Yellow, white and blue colored traps (Pherotech Inc., Chromaline traps) were compared. Blue traps were 3.7x more efficient than white traps and 1.6x more efficient than the more commonly used yellow traps. Because the timing of control measures is so important to successful management of Western flower thrips, a trapping scheme has been developed, based on the employment of blue sticky cards, for use by growers. Predator phytoseiid mites as biocontrol agents for spruce spider mite in Christmas Trees. A survey is underway to
determine the extent, distribution and impact of predator phytoseiid mites (Acari:Phytoseiidae) on spruce spider mite in Christmas tree plantations (mainly Douglas-fir). Preliminary results suggest that these predatory mites may play an important role in regulating spider mites, especially in fields with low miticide and insecticide pressure. Studies will be conducted to determine which miticides, currently in use by growers, have the least impact on predators and how management practices might be altered to enhance predator survival.
Impacts
(N/A)
Publications
- DEANGELIS, J. 1988. Greenhouse Management of Western Flower Thrips and Tomato Spotted Wilt Virus. Ornamentals Northwest Newsletter, 12(6):7-11.
- REGAN, R., FISHER, G. and DEANGELIS, J. 1989. Spruce Spider Mite Control in Douglas-Fir Christmas Tree Stock, Oregon, 1987. Insecticide and Acaricide Tests. Vol. 14. 339.
- REGAN, R., FISHER, G. and DEANGELIS, J. 1989. Spruce Spider Mite Control in Colorado Blue Spruce Nursery Stock, Oregon, 1987. Insecticide and Acaricide Tests. Vol. 14. 357.
- REGAN, R., FISHER, G. and DEANGELIS, J. 1989. Spruce Spider Mite Control in Dwarf Alberta Spruce Nursery Stock, Oregon, 1987. Insecticide and Acaricide Tests. Vol. 14, 358.
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