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Wien, Hans Christian
Cornell Faculty Member
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Optimizing conditions for growth and productivity of cut flowers has been my major aim in recent research and extension activities. I have also been active in promoting the use of unheated greenhouses (high tunnels) for extending the growing season of cut flowers and vegetables, and for lengthening the growing season of schools with gardening programs.
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Affiliations
Extension
has primary specialization area
Research
research overview
- My major research focus has been on the production and physiology of cut flowers and herbaceous perennials. Specific topics have included the reaction to daylength of sunflowers and rudbeckia, increasing productivity by apex removal, and measuring and improving sunflower vase life.
research activities
principal investigator on
area(s) of concentration/expertise
other area(s) of concentration/expertise
- vegetable crops physiology, vegetable crop production, tropical crops
keywords
- cut flowers
- high tunnels
- tropical crops
- vegetable crops physiology
- vegetable crops production
geographic focus
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domestic geographical region
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new york state geographical region
submitted impact statement
Publications
individual publications
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academic article
- Pollination and fruit set in pumpkin (Cucurbita pepo) by honey bees. Revista Brasileira de Botânica (Brazilian Journal of Botany). 33:107-113. 2010
- Floral Crop Production in High Tunnels. Hort Technology. 19:56-60. 2009
- Microenvironmental variations within the high tunnel. HortScience. 44:235-238. 2009
- Use of high tunnels in the Northeastern USA: Adaptation to cold climates. Acta Horticulturae. 87:55-59. 2009
- Development of tuber blight (Phytophthora infestans) on potato cultivars based on in vitro assays and field evaluations. HortScience. 43:1501-1508. 2008
- Effect of mulch and potato hilling on development of foliar blight (Phytophthora infestans) and the control of tuber blight infection. Potato Research. 51:101-111. 2008
- Relationship between late blight (Phytophthora infestans) of potato on tuber and foliage, as affected by the disease severity on foliage, cultivar resistance, and atmospheric and soil variables. Canadian Journal of Plant Pathology. 29:372-387. 2007
- Ethephon treatment may alleviate the suppression of female flowers of Cucurbita pepo under high temperatures. HortScience. 41:1421-1422. 2006
- Nectar and pollen production in pumpkin (Cucurbita pepo L.). Revista Brasileira de Botânica. 29:267-273. 2006
- Influence of reduced tillage and rye mulching practices on weed suppression, fruit maturity, and yield in pumpkins. Weed Technology. 18:953-961. 2005
- Time of Interseeding of Lana Vetch and Winter Rye Cover Strips Determines Competitive Impact on Pumpkins Grown Using Organic Practices. HortScience. 40:1716-1722. 2005
- Farmers’ cultural practices and management of potato late blight in Kenya Highlands: Implications for development of integrated disease management. International Journal of Pest Management. 50:135-144. 2004
- Flowering, sex expression, and fruiting of pumpkin (Cucurbita sp.) cultivars under various temperatures in greenhouse and distant field trials. HortScience. 39:239-242. 2004
- Reduced tillage, rye residues, and herbicides influence weed suppression and yield of pumpkins. Weed Technology. 18:953-961. 2004
- Flowering and fruit set of pumpkin cultivars under field conditions. Journal of American Society of Horticultural Science. 35:1074-1077. 2000
- Flowering, pollination and fruit set of two pumpkin (Cucurbita pepo L.) cultivars under field conditions. Apiacta. 35:97-105. 2000
- Effects of supplemental light duration on greenhouse sweet pepper (Capsicum annuum L.) plants and fruit yields. Journal of American Society of Horticultural Science. 123:202-207. 1998
- Effects of supplemental light duration on greenhouse tomato (Lycopersicon esculentum Mill.) plants and fruit yields. Scientia Horticulturae. 74:295-306. 1998
- The effect of mixture proportions and fertilizer nitrogen on morphology, insect pest damage, competition and yield advantages in a maize/bean intercrop. African Crop Science Journal. 4:41-49. 1996
- Dry matter assimilation and partitioning in pepper cultivars differing in susceptibility to stress-induced bud and flower abscission. Annals of Botany. 73:617-622. 1994
- Photosynthesis, dark respiration and bud sugar concentrations in pepper cultivars differing in susceptibility to stress-induced bud abscission. Annals of Botany. 73:623-628. 1994
- Screening fresh-market tomatoes for susceptibility to catfacing with GA3 foliar sprays. HortScience. 29:36-37. 1994
- Severity of tomato blossom-end scarring is determined by plant age at induction. Journal of American Society of Horticultural Science. 119:32-35. 1994
- Polyethylene mulch stimulates early root growth and nutrient uptake of transplanted tomatoes. Journal of American Society of Horticultural Science. 118:207-211. 1993
- Tomato response to starter fertilizer, polyethylene mulch, and level of soil phosphorus. Journal of American Society of Horticultural Science. 118:212-216. 1993
- Gibberellic acid foliar sprays show promise as screening tool for tomato catfacing. HortScience. 26:583-585. 1991
- Prevention of flower abscission in bell pepper. Journal of American Society of Horticultural Science. 116:516-519. 1991
- Flower and pod abscission due to heat stress in beans. Journal of American Society of Horticultural Science. 115:631-634. 1990
- Screening pepper cultivars for resistance to flower abscission: A comparison of techniques. HortScience. 25:1634-1636. 1990
- Carbohydrate partitioning and nodule function in common bean after heat stress. Crop Science Journal. 29:1292-1297. 1989
- Hormonal basis for low light intensity-induced flower bud abscission of pepper. Journal of American Society of Horticultural Science. 114:981-985. 1989
- Maximum temperature for nitrogen fixation in common bean. Crop Science Journal. 29:1260-1265. 1989
- Screening with ethephon for abscission resistance of flower buds in bell pepper. HortScience. 24:655-657. 1989
- Whole leaves versus petioles for assessing the nitrogen status of tomatoes. HortScience. 24:84-86. 1989
- Increasing yield of tomatoes with plastic mulch and apex removal. Journal of American Society of Horticultural Science. 113:342-347. 1988
- Response of fresh market tomatoes to nitrogen fertilizer and plastic mulch in a short growing season. Journal of American Society of Horticultural Science. 113:61-65. 1988
- Growth, yield and nutrient uptake of transplanted fresh market tomatoes as affected by plastic mulch and initial nitrogen rate. Journal of American Society of Horticultural Science. 112:759-763. 1987
- Vegetable cultivar testing in the Tropics. HortScience. 22:1216-1219. 1987
- Insect populations on cabbage grown with living mulches. Environmental Entomology. 15:293-299. 1986
- Outbreak of Alternaria alternata causing fruit rot of tomato in upstate New York. Plant Dis.. 68:628. 1984
- Screening turfgrasses and clovers for use as living mulches in sweet corn and cabbage. Journal of American Society of Horticultural Science. 108:1071-1076. 1983
- Dry matter production, leaf area development, and light interception of cowpea lines with broad and narrow leaflet shape. Crop Science Journal. 22:733-737. 1982
- Soybean seed deterioration in the tropics. I. The role of physiological factors and fungal pathogens. Field Crops Research. 4:113-121. 1981
- Soybean seed deterioration in the tropics. II. Varietal differences and techniques for screening. Field Crops Research. 4:123-132. 1981
- Environmental adaptation of wild and domesticated cowpeas (Vigna unguiculata L. Walp.). Field Crops Research. 3:173-187. 1980
- Ethylene evolution by thrips-infested cowpea provides a basis for thrips resistance screening with ethephon sprays. Nature. 283:192-194. 1980
- The importance of seed size in early growth of wild and domesticated cowpeas. Journal of Agricultural Science. 94:177-182. 1980
- Pod development period in cowpeas: Varietal differences as related to seed characters and environmental effects. Crop Science Journal. 18:791-794. 1978
- Photomorphogenic effects on cowpea: A comparison of controlled environment and field-grown plants. Plant Sci. Letters. 8:355-361. 1977
- C-14 assimilate distribution in Phaseolus vulgaris L. during the reproductive period. Journal of American Society of Horticultural Science. 101:510-513. 1976
- Integrated field and glasshouse screening for environmental sensitivity in cowpea (Vigna unguiculata). Ept. Agric.. 12:241-248. 1976
- Influence of flower removal on growth and seed yield of Phaseolus vulgaris L. Journal of American Society of Horticultural Science. 98:45-49. 1973
- Light-induced leaflet orientation in Phaseolus vulgaris L. Crop Science Journal. 13:721-724. 1973
- Influence of sprout tip necrosis and rosette sprout formation on internal sprouting of potatoes. American Potato Journal. 46:29-37. 1966
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article
- Can we make sunflowers more productive with the right pinching ad spacing combinations? 2012
- Sunflower pollination does not influence vase life. 2012
- Flower Growing, Chinese Style 2011
- How to Keep Delphiniums Alive more than One Season: An example of Research 2011
- A regularly-featured series called ‘Cornell-copia’ 2010
- Cut Tulips: Winter income from high tunnels 2010
- The Economics of High Tunnels. American Vegetable Grower. . 2010
- Transforming Rudbeckia into a fall-flowering cut flower 2010
- No more ugly buds!. ASCFG Quarterly. 21:56. 2009
- Petal drop in sunflowers: varietal differences. ASCFG Quarterly. 21:18-19. 2009
- Should Production in High Tunnels Be Part of Your Specialty Crop Enterprise? 2009
- Cultural practice studies with cut flowers, 2007. Sunflower daylength screening test. The Cut Flower Quarterly. 20:46-48. 2008
- Growing snaps in the field or a high tunnel? Pinch them!. The Cut Flower Quarterly. 20:16-17. 2008
- Pinching lisianthus. The Cut Flower Quarterly. 20:16-17. 2008
- Pinching sunflowers. The Cut Flower Quarterly. 20:12-13. 2008
- Day-neutral sunflowers: Do they exist, and what difference does it make?. The Cut Flower Quarterly. 19:48-49. 2007
- Can we grow cut flowers with longer stems? . The Cut Flower Quarterly. 18:32-33. 2006
- Growing Black-eyed Susan and sunflower out of season. Growing For Market. 15:17-18. 2006
- Don’t cool your tomato transplants. Amer. Vegetable Grower. 38:34-36. 1990
- How temperature stress affects fruit set. Amer. Vegetable Grower. 37:56-57. 1989
- Tunnels give higher, earlier yields of vine crops. NYS Veg. Growers News. 38. 1983
- Mechanization the erection of plastic tunnels to protect early vegetables. Agr, News Service. . 1982
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booksection
- Color spotting and fruit cracking 2003
- Flower and bud drop; Sunscald 2003
- Flower and flower bud drop and sun scald 2003
- Flowering, pollination and fruit set. Vol. NRAES Publ. 123. 2003
- Regulation of female flower development in pumpkin (Cucurbita spp.) by temperature and light 2002
- Physiological disorders 2001
- Objectives of the Workshop 1997
- The physiology of heat stress-induced abscission in pepper (Capsicum annuum L.). Vol. AVRDC Publication no. 93-410. 1993
- The influence of auxin transport inhibitor placement on stress-induced flower abscission in Capsicum 1992
- Abscission of reproductive structures in pepper: Causes, mechanisms, and control. Vol. AVRDC Publ. No. 89-317. 1989
- The physiology of cowpeas 1985
- The physiology of cowpea 1984
- Cowpea adaptation in West Africa: Photoperiod and temperature responses in cultivars of diverse origin 1980
- Improved practices for soybean seed production in the tropics 1980
- Photoperiod and air temperature effects on growth and yield of economic legumes 1980
- Drought stress of cowpea and soybean under tropical conditions 1979
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chapter
- Correlative Growth in Vegetables. The physiology of vegetable crops. 1997
- Lettuce. The physiology of vegetable crops. 1997
- Peppers. The physiology of vegetable crops. 1997
- Smallholder Vegetable Production in Northern Tanzania: Constraints and Opportunities. Smallholder Horticulture in Zimbabwe. 40-55. 1997
- The Cruciferous Vegetables. The physiology of vegetable crops. 1997
- The Cucurbits. The physiology of vegetable crops. 1997
- Transplanting. The physiology of vegetable crops. 1997
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conference paper
- de Villiers, D.S.; Wien, H.C.; Reid, J.E. and Albright, L.D. 2009. Energy Use And Yields In Tomato Production: Field, High Tunnel and Greenhouse Compared. . A paper presented at the GreenSys: the International Symposium for High Technology for Greenhouse System. 2009
- How onions grow big: a review of onion physiology. Proc. Empire State Fruit and Vegetable Expo. 153-154. 2006
- Initiating sudden wilt disorder in muskmelon with low light stress. Proceedings of Cucurbitaceae 2006. 60-64. 2006
- Maximizing yield by understanding vine crop pollination. Proc. Empire State Fruit and Vegetable Expo. 119-120. 2006
- Effective Pollination in Pumpkins. Mid-Atlantic Fruit and Vegetable Convention, Hershey, PA Proceedings II. 41-42. 2003
- Effective pollination in pumpkins. New England Vegetable and Berry Conference Proceedings. 2003
- Factors influencing fruit set. NY State Vegetable Growers Conference Proceedings. 2001
- Flowering and fruit set in vine crops. New Jersey Annual Vegetable Meeting Proc.. 2000
- Flower development, pollination and fruit set: essentials for making pumpkins. Proc. Ontario Hort. Crops Conference. 1999
- Fruit set in vine crops. NY State Vegetable Conference Proc.. 1999
- Understanding physiological disorders of tomatoes and peppers. NY State Vegetable Conference Proc.. 1999
- Do onions have a critical plant size for bulb formation?. Proc. Nat. Onion Res. Conf. Sacramento. 1998
- Cracks, bumps, blotches and other physiological disorders of tomatoes. NY State Vegetable Conf. Proc.. 1989
- Stress effects on fruit se of peppers and vine crops. NY State Vegetable Conference Proc.. 1989
- Mechanization of plastic tunnels in New York. 17th National Agr. Plastic Congress. 1983
- New tunnel material for early vegetable production in NY State. 17th National Agr. Plastic Congress. 1983
- The evaluation of genotypes for intercropping. ICRISAT. Proceedings of the international workshop on intercropping. 1981
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report
- Sustainable Smallholder Horticultural Development: Zimbabwe 1997
- Sustainable Smallholder Horticulture Development: Zimbabwe 1996
- Sustainable Smallholder Horticulture Development: Zimbabwe 1995
- 1982 vegetable varieties in trial and their sources 1982
- Results of the 1981 fresh market vegetable variety trials at Cornell 1982
- Results of the 1982 fresh market vegetable variety and cultural practice trials at Cornell 1982
- Selected list of vegetable varieties for home garden use in New York State 1982
- Vegetable varieties for roadside markets 1982
featured in archived article
speaker at Cornell event
Teaching
teaching overview
- My teaching focus is on instruction at the senior undergraduate/graduate level in Horticulture. I am teach one course, Hort 4620 'Physiology of Vegetables and Flowers', and lead a group of lecturers in another, Hort/CSS 4550 'Mineral Nutrition of Crops and Landscape Plants'
teaching activities
- HORT-7000: Graduate Teaching Experience - Spring 2013
- HORT-9900: Thesis Research, Doctor of Philosophy - Spring 2013
- HORT-9900: Thesis Research, Doctor of Philosophy - Fall 2012
- HORT-7000: Graduate Teaching Experience - Spring 2012
- HORT-9900: Thesis Research, Doctor of Philosophy - Spring 2012
- HORT-9900: Thesis Research, Doctor of Philosophy - Fall 2011
Service
outreach overview
- My extension and outreach focus is on providing current and useful information on production of horticultural crops in high tunnels, and supporting the growth of a local cut flower industry that provides income to growers in NYS and the Northeastern USA
service to the profession
- Cornell Plantations Board of Advisors 2011 -
- Greenhouse Horticulture PWT Committee Member 2008 -
- Association of Specialty Cut Flower Growers Member 2003 -
- International Society for Horticultural Science Member 1985 -
- American Society of Agronomy Member 1973 -
- American Society for Horticultural Science Officer, Vice President 1964 -
- Vegetable Crop PWT
- Association of Specialty Cut Flower Growers Program Organizer 2008 - 2009
- Association of Specialty Cut Flower Growers Attendee, Meeting 2008
- American Society of Horticultural Science Attendee, Meeting 2008
- International Society of Horticultural Science Attendee, Meeting 2008
reviewer or editor for
Background
education and training
- Ph.D. in Vegetable Crops, Dept. of Vegetable Crops, Cornell 1971
- Department of Vegetable Crops, Cornell 1967
- Ontario Agricultural College, University of Toronto 1963
awards and honors
- Member, 1971
Other
alternate name
- Chris Wien
college
- CALS
research keyword
- cut flowers
- high tunnels
- tropical crops
- vegetable crops physiology
- vegetable crops production
name prefix
- Professor