Peter Landschoot, Ph.D.

Interests

Dr. Landschoot's subject matter interests include integrated turfgrass pest management with emphasis in weeds & diseases, use of composts as soil amendments, turfgrass species & variety evaluation, and soil fertility/turfgrass fertilization.

Courses Taught

• TURF 436W - Case Studies in Turfgrass Management
• TURF 956A - Case Studies in Golf Turf Management
• TURF 499 - Turfgrass Management Practices in the United Kingdom and Italy

Professional Background

• Assistant Golf Course Superintendent, The Country Club of Rochester, 1977–80.
• Assistant Prof. Turfgrass Science, The Pennsylvania State University, 1989–94.
• Associate Prof. Turfgrass Science, The Pennsylvania State University, 1994–2003.
• Professor Turfgrass Science, The Pennsylvania State University, 2003–present.
• Professional Societies: Crop Science Society of America, American Phytopathological Society, International Turfgrass Society, and American Society of Horticultural Science
• Editorial Service: Associate Editor Plant Disease (APS), Senior Editor (Plant Disease), Co-editor International Turfgrass Research Journal (ITS), Associate Editor Applied Turfgrass Science

Selected Publications

Landschoot, P.J. 2023. Tolerance of little bluestem to ACCase-inhibiting herbicides in Pennsylvania. Crop, Forage, and Turfgrass Management. 9:e20236. http://doi.org/10.1002/cft2.20236

Landschoot, P.J. 2023. Canada thistle injury with spring-applied herbicides in infrequently mowed fine fescue in Pennsylvania. Crop, Forage, and Turfgrass Management. 9:e20211. https//doi.org/10.1002/cft2.20211

Landschoot, P.J., J. Spargo, and B. McGraw. 2022. A survey of turfgrass irrigation water in Pennsylvania. Crop, Forage, and Turfgrass Management. 8:1-9. https//doi10.1002/cft2.20157

Carroll, D.E., J.E. Kaminski, and P.J. Landschoot. 2021. Influence of cultivation method, seeding rate, and fertilizer rate on establishment of creeping bentgrass for putting green renovation. Crop, Forage, and Turfgrass Management. doi:10.1002/cft2.20085.

Carroll, D.E., J.E. Kaminski, and P.J. Landschoot. 2020. Creeping bentgrass seed germination in growth chambers at optimal and suboptimal temperatures. Crop, Forage, and Turfgrass Management. 6:e20068 (1-8). doi:10.1002/cft2.20068.

Landschoot, P.J., M.A. Fidanza, and S.M. Kister. 2020. Influence of grass species and mowing practices on weed cover and quality in infrequently mowed grass stands. International Turfgrass Society Research Journal. https://doi.org/10.1002/its2.18. 

Liu, B. and P.J. Landschoot. 2018. Influence of phosphorus in starter fertilizer on tall fescue establishment. HortScience 53(12):1897-1906. 

Landschoot, P.J. 2018. Control of wirestem muhly with herbicides in non-mowed fine fescue in Pennsylvania. Crops, Forage, and Turfgrass Management 4:180050 (1-3). doi:10.2134/cftm2018.07.0050

Landschoot, P.J. 2018. Calibrating your fertilizer spreader. Extension Publication Code EE0242. 8 pp. https://extension.psu.edu/calibrating-your-fertilizer-spreader

Landschoot, P.J., M.J. Carroll, J.M. Goatley, Jr., and T.R. Turner. 2017. Turfgrass nutrient management and regulatory issues in the Chesapeake Bay watershed. International Turfgrass Society Research Journal 13:1-11. doi:10.2134/itsrj2016.05.0419.

Landschoot, P.J. 2017. Turfgrass fertilization: A basic guide for professional turfgrass managers. Extension Publication UC184. 21 pp. https://extension.psu.edu/turfgrass-fertilization-a-basic-guide-for-professional-turfgrass-managers

Landschoot, P.J. and B. Liu. 2016. Tolerance of perennial ryegrass (Lolium perenne) cultivars to simulated fall traffic. Acta Horticulturae 1122:91-96.

Landschoot, P.J. and M.J. Carroll. 2016. Tolerance of microclover to postemergence and preemergence herbicides. Crops, Forages, and Turfgrass Management 2:1-3. doi:10.2134/cftm2015.0226

Huang, Y., J. Kaminski, and P.J. Landschoot. 2015. Regulation with trinexapac-ethyl and dew removal at the time of fungicide application did not influence dollar spot control. HortScience 50:496-500

Landschoot, P.J., A. Wolf, and J. Schwenk. 2014. Summary of Mehlich-3 P data from home lawn soil tests in Pennsylvania. Applied Turfgrass Science 11(1):1-2. doi:10.2134/ATS-2014-0048-BR

Landschoot, P.J. 2014. Iron in your irrigation water: Why lab results may not always tell the entire story. Plant Management Network Crop News. http://wwwplantmanagementnetwork.org/pub/php/news/2014/Iron/ and  http://psuturf.com/2014/07/iron-in-your-irrigation-water-why-lab-results-may-not-always-tell-the-entire-story/

Raley, R., P.J. Landschoot, and J. Brosnan. 2013. Influence of phosphorus and nitrogen on annual bluegrass encroachment in a creeping bentgrass putting green. International Turfgrass Research Journal. 12:649-656

Lyons, E.M., P.J. Landschoot, and D.R. Huff. 2011. Root distribution and tiller densities of creeping bentgrass cultivars and greens-type annual bluegrass cultivars in a putting green. HortScience 46:1411-1417.

Delvalle, T., P.J. Landschoot, and J.E. Kaminski. 2011. Effects of dew removal and mowing frequency on fungicide performance for dollar spot control. Plant Disease 95:1427-1432.

Cook, P.J., P.J. Landschoot, and M.J. Schlossberg. 2009. Inhibition of Pythium spp. and suppression of Pythium blight of turfgrasses with phosphonate fungicides. Plant Disease 93:809–814.

Aamlid, T.S., P.J. Landschoot, and D. Huff. 2009. Tolerance to simulated ice encasement and Microdochium nivale in USA selections of greens-type Poa annua. Acta Agriculturae Scandinavica, Section B – Soil & Plant Science 59(2):170–178.

Cook, P.J., P.J. Landschoot, and M.J. Schlossberg. 2009. Suppression of anthracnose basal rot symptoms and improved putting green quality with phosphonate fungicides. International Turfgrass Society Research Journal 11:181–194.

Schlossberg, M.J., F.C. Waltz, Jr., P.J. Landschoot, and B.S. Park. 2008. Recent mechanical cultivation of lawns enhances lime application efficacy. Agronomy Journal 100(3):855–861.

Aamlid, T. and P.J. Landschoot, 2007. Effect of spent mushroom substrate on seed germination of cool-season turfgrasses. HortScience 42:161–167.

Landschoot, P.J. and M. Mocioni. 2005. Lotta alle infestanti del tappeto erboso (Weed control in turfgrass). Informatore Fitopatologico La Difesa Della Piante 7(8):21–32.

Park, B.S. and P.J. Landschoot. 2005. Combinations of nonselective herbicides for the control of Kentucky bluegrass and tall fescue. International Turfgrass Society Research Journal 10:1198–1204.

McNitt, A.S. and P.J. Landschoot. 2005. The effects of soil reinforcing materials on the traction and divot resistance of a sand rootzone. International Turfgrass Society Research Journal 10:115–1123.

Landschoot, P.J., B.S. Park, A.S. McNitt, and M.A. Fidanza. 2004. Effect of dazomet on annual bluegrass emergence and creeping bentgrass establishment in putting green turf. HortScience 39:1478–1482.

McNitt, A.S., P.J. Landschoot, and D. Petrunak. 2004. Evaluation of the playing surface quality of an infilled synthetic turf system, Proceedings 1st International Conference Turfgrass Management and Science for Sports Fields. Athens, Greece. June 2–7. Acta Horticulturae ISHS No. 661. pp. 559–565.

McNitt, A.S., P.J. Landschoot and D.V. Waddington. 2004. Effects of turfgrass, cutting height, and soil conditions on traction. Proceedings 1st International Conference Turfgrass Management and Science for Sports Fields. Athens, Greece. June 2–7. Acta Horticulturae ISHS No. 661. pp. 39–49.

Titone, P., M. Mocioni, P.J. Landschoot, M.L. Gullino. 2004. Survey of ectotrophic root-infecting fungi associated with turfgrass patch diseases in Italy. Proceedings 1st International Conference Turfgrass Management and Science for Sports Fields. Athens, Greece. June 2–7. Acta Horticulture ISHS No. 661. pp. 491–499.

McNitt, A.S., P.J. Landschoot, D.V. Waddington. 2004. Effects of turfgrass, cutting height and soil conditions on traction. Proceedings 1st International Conference Turfgrass Management and Science for Sports Fields. Athens, Greece. June 2–7. Acta Horticulture ISHS No. 661. pp. 39–48.

McNitt, A.S. and P.J. Landschoot. 2003. The effects of soil reinforcing materials on the surface hardness, soil bulk density, and water content of a sand root zone. Crop Science 43:957–966.

Park, B.S. and P.J. Landschoot. 2003. Effect of dazomet on annual bluegrass emergence in turf maintained as a golf course fairway. Crop Science 43:1387–1394.

Titone, P., P.J. Landschoot, and M.L. Gullino. 2002. Le malattie radicali dei tappeti erbosi: aspetti di biologia, epidemiologia e difesa. Informatore Fitopatologico La Difesa Della Piante 17(44):46-51.

Landschoot, P.J., B.S. Park, and W. Uddin. 2001. Nontarget effects of PCNB on putting green turf. International Turfgrass Society Research Journal 9:679–685.

McNitt, A.S. and P.J. Landschoot. 2001. The effects of soil-reinforcing inclusions in an athletic field root-zone. International Turfgrass Society Research Journal 9:565–573.

McNitt, A.S. and P.J. Landschoot. 2001. Evaluation of a modular turfgrass system amended with shredded carpet. International Turfgrass Society Research Journal 9:559–565.

Landschoot, P.J. and C.F. Mancino. 2000. A comparison of visual vs. instrumental measurement of color differences in bentgrass turf. HortScience 35:914-916.

Backman, P.A., P.J. Landschoot, and D.R. Huff. 1998. Variation in pathogenicity, morphology, and RAPD marker profiles in Colletotrichum graminicola from turfgrasses. Crop Science 39:1129–1135.

Landschoot, P.J. and C.F. Mancino. 1997. Assessment of the Minolta CR-310 Chroma Meter for predicting nitrogen status of Agrostis stolonifera L. International Turfgrass Society Research Journal 8:711-718. (Principal author)

Landschoot, P.J. and A.S. McNitt. 1997. Effect of nitrogen fertilizers on suppression of dollar spot disease of Agrostis stolonifera L. International Turfgrass Society Research Journal 8:905-912.

Waddington, D.V., A.S. McNitt, and P.J. Landschoot. 1997. Constructing and maintaining safe playing surfaces. p. 107-113. In International Symposium on Safety in Baseball/Softball. E.F. Hoerner and F.A. Cosgrove (eds.)  ASTM Special Technical Publication 1313.  West Conshohocken, PA.

Landschoot, P.J. 1996. First report of necrotic ring spot on putting greens in Pennsylvania. Plant Disease 80:712.

Landschoot, P.J. 1993. Variation in cultural characteristics and pathogenicity within a local population of Magnaporthe poae. International Turfgrass Society Research Journal 7:335-340.

Landschoot, P.J. and M.L. Gullino. 1993. First report of Magnaporthe rhizophila on Kentucky bluegrass in North America. Plant Disease 77:1169.

Landschoot, P.J., B.B. Clarke, and A.B. Gould. 1993. Ecology and epidemiology of ectotrophic root-infecting fungi causing patch diseases of turfgrasses. p. 73–105. In B.B. Clarke and A.B. Gould (eds.) Turfgrass Patch Diseases Caused by Ectotrophic Root-Infecting Fungi. American Phytopathological Society Press, St. Paul, MN.

Landschoot, P.J. 1993. Taxonomy and biology of ectotrophic root-infecting fungi associated with patch diseases of turfgrasses. p. 41–71. In B.B. Clarke and A.B. Gould (eds.) Turfgrass Patch Diseases Caused by Ectotrophic Root-Infecting Fungi. American Phytopathological Society Press, St. Paul, MN.

Landschoot, P.J., T.L. Watschke, and B.F. Hoyland. 1993. Influence of preemergence and postemergence herbicides on rooting of turfgrasses. Weed Technology 7:123–126.

Waddington, D.V., P.J. Landschoot, J.M. Clark, and M.A. Fidanza. 1993. Evaluation of liquid nitrogen sources and the urease inhibitor N-(n-butyl) thiophosphoric triamide on Kentucky bluegrass turf. International Turfgrass Society Research Journal 7:572-579. 

Landschoot, P.J. 1992. Magnaporthe. p. 67–70. In L.L. Singleton, J. D. Mihail, and C.M. Rush (eds.) Methods for Research on Soilborne Phytopathogenic Fungi. American Phytopathological Society Press, St. Paul, MN.

Landschoot, P.J. and B.F. Hoyland. 1992. Gray leaf spot of perennial ryegrass turf in Pennsylvania. Plant Disease 76:1280–1282.

Elliott, M.L. and P.J. Landschoot. 1991. Fungi similar to Gaeumannomyces associated with root rot of turfgrasses in Florida. Plant Disease 75:238-241.

Landschoot, P. J. and N. Jackson. 1989. Gaeumannomyces incrustans sp. nov., a root-infecting hyphopodiate fungus from grass roots in the United States. Mycological Research 93:55–58.

Landschoot, P.J. and N. Jackson. 1989. Magnaporthe poae sp. nov., a hyphopodiate fungus with a Phialophora anamorph, from grass roots in the United States. Mycological Research 93:59–62.

Landschoot, P. J. and N. Jackson. 1989. Pathogenicity of some fungi with Phialophora anamorphs that infect the roots of turfgrasses. Phytopathology 80:520–526.

Waddington, D.V., P.J. Landschoot, and N.W. Hummel, Jr. 1989. Response of Kentucky bluegrass turf to fertilizers containing dicyandiamide. Communications in Soil Science and Plant Analysis. 20:2149-2170. 

Landschoot, P.J. and D.V. Waddington. 1987. Response of turfgrass to various nitrogen sources. Soil Sci. Soc. Am. J. 51:225–230.

Selected Extension Publications:

Turfgrass growth, development, and identification:

Landschoot, P.J. The cool-season turfgrasses: Basic structures, growth and development. https://extension.psu.edu/the-cool-season-turfgrasses-basic-structures-growth-and-development

Landschoot, P.J. The cool-season turfgrasses: Identification. https://extension.psu.edu/the-cool-season-turfgrasses-identification

Turfgrass species, seed mixtures, and cultivars:

Landschoot, P.J. Turfgrass species for Pennsylvania. https://extension.psu.edu/turfgrass-species-for-pennsylvania

Harper, J. and P.J. Landschoot. Turfgrass seed and seed mixtures. https://extension.psu.edu/turfgrass-seed-and-seed-mixtures

Landschoot, P.J. Evaluation of new bentgrasses for golf course fairways and tees.  https://extension.psu.edu/evaluation-of-new-bentgrasses-for-golf-course-fairways-and-tees

Landschoot, P.J. Evaluation of some new bentgrasses for putting greens. https://extension.psu.edu/evaluation-of-some-new-bentgrasses-for-putting-greens

Establishment and renovation:

Landschoot, P.J. Lawn establishment. https://extension.psu.edu/lawn-establishment

Landschoot, P.J. Renovation of lawns. https://extension.psu.edu/renovation-of-lawns

Fertilization and liming:

Landschoot, P.J. Turfgrass fertilization: A basic guide for professional turfgrass managers. https://extension.psu.edu/turfgrass-fertilization-a-basic-guide-for-professional-turfgrass-managers

Landschoot, P.J. Calibrating your fertilizer spreader. https://extension.psu.edu/calibrating-your-fertilizer-spreader

Harper, J.C. and P.J. Landschoot. Liming turfgrass areas. https://extension.psu.edu/liming-turfgrass-areas

Weed management:

Landschoot, P.J. 2019. Control of summer annual grass weeds in turfgrass.  https://extension.psu.edu/control-of-summer-annual-grass-weeds-in-turfgrasses 

Landschoot, P.J. 2019. Postemergence control of crabgrass and other summer annuals. https://extension.psu.edu/postemergence-control-of-crabgrass-and-other-summer-annual-grasses-in-lawns

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Annual or daisy fleabane (Erigeron annuus). https://extension.psu.edu/lawn-and-turfgrass-weeds-annual-or-daisy-fleabane 

Landschoot, P.J. 2022. Lawn and turfgrass weeds: Barnyardgrass [Echinochloa crus-galli (L.) Beauv.]

Landschoot, P.J. 2020. Lawn and turfgrass weeds. Birdsfoot trefoil (Lotus corniculatus). https://extension.psu.edu/lawn-and-turfgrass-weeds-birdsfoot-trefoil-lotus-corniculatus-l

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Black medic (Medicago lupulina). https://extension.psu.edu/lawn-and-turfgrass-weeds-black-medic-medicago-lupulina-l

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Common chickweed (Stellaria media). https://extension.psu.edu/lawn-and-turfgrass-weeds-common-chickweed

Landschoot, P.J. 2019. Lawn and turfgrass weeds: Common field speedwell (Veronica persica). https://extension.psu.edu/lawn-and-turfgrass-weeds-common-field-speedwell

Landschoot, P.J. 2019. Lawn and turfgrass weeds: Corn speedwell (Veronica arvensis). https://extension.psu.edu/lawn-and-turfgrass-weeds-corn-speedwell 

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Creeping buttercup (Ranunculus repens). https://extension.psu.edu/lawn-and-turfgrass-weeds-creeping-buttercup

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Dead nettle (Lamium purpureum). https://extension.psu.edu/lawn-and-turfgrass-weeds-dead-nettle

Landschoot, P.J. 2020. Lawn and turfgrass weeds: English daisy (Bellis perennis). https://extension.psu.edu/lawn-and-turfgrass-weeds-english-daisy

Landschoot, P.J. 2022. Lawn and turfgrass weeds: Goosegrass [Eleusine indica (L.) Gaertn.] 

Landschoot, P.J. 2019. Lawn and turfgrass weeds: Hairy bittercress (Cardamine hirsuta). https://extension.psu.edu/lawn-and-turfgrass-weeds-hairy-bittercress

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Japanese stiltgrass [Microstegium vimineum (Trin.) A. Camus]. https://extension.psu.edu/lawn-and-weeds-japanese-stiltgrass-microstegium-vimineum-trin-a-camus

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Red clover (Trifolium pratense). https://extension.psu.edu/lawn-and-turfgrass-weeds-red-clover-trifolium-pratense-l

Landschoot, P.J. 2022. Lawn and turfgrass weeds: Smooth crabgrass [Digitaria ischaemum (Schreb.) Muhl.] and large crabgrass [Digitaria sanguinalis (L.) Scop.]. 

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Spotted spurge (Chamaesyce maculata). https://extension.psu.edu/lawn-and-turfgrass-weeds-spotted-spurge-chamaesyce-maculata-l

Landschoot, P.J. 2019. Lawn and turfgrass weeds: Thyme-leaf speedwell (Veronica serpyllifolia). https://extension.psu.edu/lawn-and-turfgrass-weeds-thyme-leaf-speedwell

Landschoot, P.J. 2019. Lawn and turfgrass weeds: Wild violet (Viola spp.). https://extension.psu.edu/lawn-and-turfgrass-weeds-wild-violet

Landschoot, P.J. 2019. Lawn and turfgrass weeds: White clover (Trifolium repens). https://extension.psu.edu/lawn-and-turfgrass-weeds-white-clover

Landschoot, P.J. 2022. Lawn and turfgrass weeds: Yellow foxtail and green foxtail. 

Landschoot, P.J. Lawn and turfgrass weeds: Yellow nutsedge (Cyperus esculentus). https://extension.psu.edu/lawn-and-turfgrass-weeds-yellow-nutsedge-cyperus-esculentus

Landschoot, P.J. 2020. Lawn and turfgrass weeds: Yellow woodsorrel (Oxalis stricta). https://extension.psu.edu/lawn-and-turfgrass-weeds-yellow-woodsorrel-oxalis-stricta-l

Disease Management:

Landschoot, P.J. Turfgrass diseases: Gray snow mold (causal fungus: Typhula incarnata). 

Winterkill:

Landschoot, P.J. Winterkill of turfgrasses. https://extension.psu.edu/winterkill-of-turfgrasses

Irrigation water:

Landschoot, P.J. Irrigation water quality guidelines for turfgrass sites. https://extension.psu.edu/irrigation-water-quality-guidelines-for-turfgrass-sites