Rich Marini, Ph.D.

Rich Marini, Ph.D.

  • Professor of Horticulture
University Park, PA 16802

Areas of Expertise

  • Tree and Small Fruit Physiology
  • Fruit production systems
  • Data Analysis

Education

  • PhD., Virginia Polytechnic Institute and State University -- Horticulture, 1981
  • M.S., University of Vermont -- Plant and Soil Science, 1978
  • B.S., University of Massachusetts -- Plant and Soil Science, 1974

Appointment: Appointment is 33% Teaching, 33% Extension and 34% Research. Research interests include tree fruit and berry crop physiology and management practices, and data analysis and interpretation. Courses taught include HORT 573 (Interpreting Data From Experiments with quantitative treatments); FDSC/HORT 233 (The Science of Wine Making); the lab section of HORT 315 (Environmental Effects on Horticultural Crops);and HORT 431 (Small Fruit Production), taught in fall of odd years. I am the Administrative Advisor for the multi-state project NC-140 and I am the Editor of the Journal of the American Pomological Society.

Professional Experience:

  • 2016- present: Professor, Department of Plant Science, Penn State
  • 2012- 2016: Professor and Head, Department of Plant Science, Penn State
  • 2004- 2012: Professor and Head, Dept. of Horticulture, Penn State University
  • 1997-2004: Professor, Dept. of Horticulture, Virginia Tech
  • 1985-1997: Associate Professor, Dept. of Horticulture, Virginia Tech
  • 1981-1985: Assistant Professor, Dept. of Horticulture, Rutgers University

Honors, Distinctions and Awards:

  • The Shepard Award for the best research paper in the Journal of the American Pomological society, 2016.
  • The Shepard Award for the best research paper in the Journal of the American Pomological Society, 2014
  • U.P. Hedrick Award for best graduate student paper in the Journal of the American Pomological Society, 2013
  • Outstanding Alumni Award, Dept. of Horticulture, Virginia Tech, 2013
  • Fellow: The American Society for Horticultural Science, highest award presented by the Society, 2005
  • The Peach Award, presented by the National Peach Council for outstanding contributions to the peach industry, 2005
  • The Sheppard Award, presented by the American Pomological Society, for the best scientific paper in the Fruit Varieties Journal, 1990
  • Who's Who in Science and Technology, 1985
  • The Research Award, presented by Virginia Tech Chapter of Sigma Xi, 1981
  • Who's Who in Frontiers of Science and Technology, 2nd Edition

Research Interests:

    • Apple Rootstock Evaluations
    • Physiology of berry crops
    • Apple and peach tree physiology

      Recent Publications since 1997:

      • R.P. Marini and G. Fazio. 2018. Apple rootstocks: history, physiology, management, and breeding. Horticultural Reviews 45:197-312.
      • A.C. Myers, D.R. Decoteau, R. Marini, and D.D. Davis. 2018. Sensititivty of eleven milkweed (Asclepias) species to ozone. Northeast Naturalist 25(2):265-276. https://doi.org/10.1656/045.025.0210  
      • K.L. Loyd, D.D. Davis, R.P. Marini, and D.R. Decoteau. 2018. Effects of nighttime ozone treatment at ambient concentrations on sensitive and resistant snap bean genotypes. J. Amer. Soc. Hort. Sci. 143(1):23-33. doi: 10.21273/JASHS04253-17
      • T.A. Baugher, R. Marini, J.R. Schupp, and C.B. Watkins. 2017. Prediction of bitter pit in 'Honeycrisp' apples and best management implications. HortScience 52(10):1368-1374. doi: 10.21273/HORTSCI12266-17
      • W.P. Cowgill, Jr., W.R. Autio, E.E. Hoover, R.P. Marini, and P.A. Domoto. 2017. NC-140 multistate research project: improving economic and environmental sustainability in tree-fruit production through changes in rootstock use. J. Amer. Pomol. Soc. 71(1):34-46.
      • J.R. Schupp, H.E. Winzeler, T.M. Kon, R.P.Marini, T.A.Baugher, L.F. Kime, and M.A. Schupp. 2017.  A method for quantifying whole-tree pruning severity in mature tall spindle apple plantings. HortScience 52(9):1223-1240. doi: 10.21273/HORTSCI12158-17 
      • R.P. Marini, W.R. Autio, B. Black, J. Cline, W.P. Cowgill, Jr., R.M. Crassweller, C. Hampson, M.M. Kushad, R. Moran, M. Parker, R.L. Perry, G.L. Reighard, T. Robinson, and D. Wolfe. 2016. Time required for classifying rootstock vigor in multi-location rootstock trials. J. Amer. Pomol. Soc. 70(2):82-91.
      • K.M. Kelley, R. Primrose, R. Crassweller, J.E. Hayes and R. Marini. 2016. Consumer peach preferences and purchasing behavior: a mixed methods study. J. Sci. Food Agric. 96:2451-2461. doi 10.1002/jsfa.7365
      • C.A. Ledbetter and R. Marini. 2016. Pruning style and long term irrigation regime effects on 'Sunpreme' raisin quality and fruitfulness. J. Amer. Pomol. Soc. 70(1):36-44.
      • E.K Lavely,  B.K. Gugino, K. Demchak, R.P. Marini. 2013. The effect of Rhizoctonia fragariae, soil type, compost, and mechanical root injury on strawberry growth. J. Amer. Pomological Soc. 67: 228-236.
      • R.P. Marini, W.R. Autio, B. Black, J. Cline, W.R. Cowgill, Jr., R. M. Crassweller, P. A. Domoto, C. Hampson, R. Morgan, R.A. Quezada, T. Robinson, D.L. Ward, and D. Wolfe. 2013. Return bloom on 'Golden Delicious' apple trees as affected by previous season's crop density on three rootstocks at 11 locations. J. Amer. Pomological Soc. 67:73-79.
      • R.P. Marini, W.R. Autio, B. Black, J. Cline, W.R. Cowgill, Jr., R. M. Crassweller, P. A. Domoto, C. Hampson, R. Morgan, R.A. Quezada, T. Robinson, and D. Wolfe. 2013. The influence of crop density on annual trunk growth of 'Golden Delicious' apple trees on three dwarfing rootstocks at 11 locations. J. Amer. Pomological Soc. 66:183-195.
      • Marini, R.P. and D. Ward. 2012. Using analysis of covariance with unequal slopes to increase efficiency and information obtained from designed experiments. J. Amer. Pomological Soc. 66: 91-100.
      • Marini,R.P.,  W.R. Autio, B. Black, J. Cline, W.R. Cowgill, Jr., R.. M. Crassweller, P. A. Domoto, C. Hampson, R. Morgan, R.A. Quezada, T. Robinson, M. Stasiak, D.L. Ward, and D. Wolfe. 2012. Summary of the NC-140 apple physiology trial: the relationship between 'Golden Delicious' fruit weight and crop density at 12 locations as influenced by three dwarfing rootstocks. J. Amer. Pomological Soc. 66: 78-90.
      • E.E. Hoover, R.P. Marini, E. Tepe, W. R. Autio, A. R. Biggs, J. M. Clements, R. M. Crassweller, D. D. Foster, M.J. Foster, P.M. Hirst, D. Doud Miller, M.L. Parker, G.M. Peck, J. Racsko, T.L. Robinson, and M. R. Warmund. 2012. eApples: A Case Study in Using eXtension to Increase Access to Research-based Information. HortTechnology  22:576-579.
      • T.M. Kon, J. Schupp, H.E. Winzeler  and R. Marini. 2012. Influence of mechanical thinning severity treatments on vegetative and reproductive tissues, fruit set, yield, and fruit quality of 'Buckey Gala'. HortScience 48:40-46.
      • Pellerin, B.P., D. Buszard, D. Iron, C.G. Embree, R.P. Marini, D.S. Nichols, G.H. Neilson and D. Neilson. 2011. A theory of blossom thinning to consider maximum annual flower bud numbers on biennial apple trees. HortScience46:40-43.

      • Marini, R.P., B. Black, J. Cline, R.M. Crassweller, P.A. Domoto, C. Hampson, S. Johnson, K. Kosola, S. McArtney, J. Masabni, R. Moran, R.P. Quezda, T. Robinson, and C.R. Rom. 2009. Performance of 'Golden Delicious' apple on 23 rootstocks at 12 locations: A five-year summary of the 2003 NC-140 dwarf rootstock trial. J. Amer. Pomol. Soc. 63(3):115-127.

      • Marini, R.P., R. Moran, C. Hampson, M. Kushad, J. Masabni, R. Parra Quezda, R. Perry, and C. Rom. 2008. Effect of dwarf apple rootstocks on average “Gala' fruit weight at six locations over three seasons. J. Amer. Pomol. Soc. 62: 129-136.
      • Marini, R.P., J.L. Anderson, W.R. Autio, B.H. Barritt, J. Cline, W.P. Cowgill, Jr., R.C. Crassweller, R.M. Garner, A. Gauss, R. Godin, G.M. Greene, C. Hampson, P. Hirst, M.M. Kushad, E. Mielke, R. Moran, C.A. Mullins, M. Parker, R.L. Perry, J.P. Privé, G.L. Reighart, T. Robinson, C.R. Rom, T. Roper, J.R. Schupp, E. Stover, and R. Unrath. 2006. Performance of 'Gala' Apple trees on 18 Dwarfing Rootstocks: Ten-Year Summary of the 1994 NC-140 Rootstock Trial. J. Amer. Pomol. Soc. 60: 69 – 83.
      • Marini, R. P., B. H. Barritt, G. R. Brown, J. Cline, W. P. Cowgill, Jr., R. M. Crassweller, P. A. Domoto, D. C. Ferree, J. Garner, G. M. Greene, C. Hampson, P. Hirst, M. M. Kushad, J. Masabni, E.Mielke, R. Moran, C. A. Mullins, M. Parker, R. L. Perry, J. P. Privé, G. L. Reighard, T. Robinson, C. R. Rom, T. Roper, J. R. Schupp, E. Stover, and R. Unrath. 2006. Performance of 'Gala' Apple on Four Semi-Dwarf Rootstocks: A Ten-Year Summary of the 1994 NC-140 Semi-Dwarf Rootstock Trial. J. Amer. Pomol. Soc. 60: 58 – 68.
      • Pathange, L.P., Pl Millikargunan, R.P. Marini, S. O'Keefe, and D. Vaughan. 2006. Non-destructive evaluation of apple maturity using an electronic nose system. J. Food Eng. 77:1018-1024.
      • White, S.A., H.L. Scoggins, R.P. Marini, and J.G. Latimer. 2005. Multivariate repeated measures analysis of plant growth regulators on Tradescantia virginian. HortScience 40:404-408.
      • Marini, R.P. and J.A. Barden. 2004. Yield , fruit size, red color, and a partial economic analysis for 'Delicious' and 'Empire' in the NC-140 1994 systems Trial in Virginia. J. Amer. Pomol. Soc. 58: 4-11.
      • Lo Giudice, T.K. Wolf, and R.P. Marini 2003. Vegetative response of Vitis vinifera to prohexadione-calcium. HortScience 38:1435-1438.
        Marini, R.P. 2003. Fruitlet size and position within the cluster influence apple fruitlet susceptibility to chemical thinners. J. Hort. Sci. & Biotechnology 78:813-820.
      • Seeman, B., S. Sumner, R. Marini, and K. Kniel. 2003. Internalization of Escherichia coli in apples under natural conditions. Dairy food and Environmental Sanitation. 22:667-673.
      • Marini, R.P. 2003. Peach yield, fruit weight, and crop value are affected by number off fruiting shoots per tree. HortScience 38: 512-514.
      • Marini, R.P. 2003. Approaches to analyzing experiments with factorial arrangements of treatments plus other treatments. HortScience 38:117-120.
        Lewallen, K.S. and R.P. Marini. 2003. Relationship between flesh firmness and ground color in peach as influenced by light and canopy position. J. Amer. Soc. Hort. Sci. 128:163-170.
      • Marini, R.P., M.L. Parker, J.A. Barden, and C.R. Unrath. 2003. The effect of eight dwarf rootstocks on burrknot development on 'Gala' apple trees at two locations. J. Amer. Pom. Soc. 57:93-96.
      • Marini, R.P. 2002. Heading fruiting shoots before bloom is equally effective as blossom removal in peach crop load management. HortScience 37:642-646.
      • Marini, R.P., J.A. Barden, J.A. Cline, R.L. Perry, and T. Robinson. 2002. Effect of apple rootstocks on average 'Gala' fruit weight at four locations after adjusting for crop load. J. Amer. Soc. Hort. Sci. 127:749-753.
      • Marini, R.P., J.A. Barden, and J.R. Schupp. 2001. Wind effects on apple in the eastern United States. HortScience 36:247-249
      • Marini, R.P. 2002. Thinning 'Golden Delicious' and spur 'Delicious' with combinations of carbamates and NAA. HortScience 37:534-538.
      • Marini, R.P. 2002. Experience with thinning: what factors contribute to contradicting results? HortScience 37(3): 484-486.
      • Marini, R.P. 2002. Thinning 'Golden Delicious' and spur 'Delicious' with combinations of carbamates and NAA. HortScience. 37(3):In Press.
      • Marini, R.P. 2002. Experience with thinning: what factors contribute to contradicting results? HortScience 37(3):In Press.
      • Marini, R.P. 2002. Heading fruiting shoots before bloom is equally effective as blossom removal in peach crop load management. HortScience 37(4):In Press.
      • Marini, R.P. 2003. Approaches to analyzing experiments with factorial arrangements of treatments plus other treatments. HortScience 38: In Press.
      • Marini, R.P., J.A. Barden, J.A. Cline, R.L. Perry, and T. Robinson. 2002. Effect of apple rootstocks on average 'Gala' fruit weight at four locations after adjusting for crop load. J. Amer. Soc. Hort. Sci. 127:In Press.
      • Marini, R.P. 2001. Estimating mean fruit weight and mean fruit value for apple trees: comparison of two sampling methods with the true mean. J. Amer. Soc. Hort. Sci. 126:503-510.
      • Marini, R.P., B.H. Barritt, J.A. Barden, J. Cline, R.L. Granger, M.M. Kushad, M. Parker, R.L. Perry, T. Robinson, S. Khanizadeh, and C.R. Unrath. 2001. Performance of 'Gala' Apple on Eight Dwarf Rootstocks: Ten-Year Summary of the 1990 NC-140 Rootstock Trial. J. Amer. Pom. Soc. 55:197-204.
      • Marini, R.P., B.H. Barritt, J.A. Barden, J. Cline, E.E. Hoover, R.L. Granger, M.M. Kushad, M. Parker, R.L. Perry, T. Robinson, S. Khanizadeh, and C.R. Unrath. 2001. Performance of Ten Apple Orchard Systems: Ten -Year Summary of the 1990 NC-140 Systems Trial. J. Amer. Pom. Soc. 55:222-238.
      • Barden, J.A. and R.P. Marini. 2001. Yield, fruit size, red color, and estimated crop value in the NC-140 1990 cultivar/rootstock trial in Virginia. J. Amer. Pomol. Soc. 55:154-158.
      • Barden, J. A. and R.P. Marini. 2001. Comparison of methods to express growth, size, and productivity of apple trees. J. Amer. Pomol. Soc. 55:251-256.
      • Marini, R.P. 2001. Combinations of ethephon and excel for thinning 'Delicious apple trees. J. Amer. Soc. Hort. Sci. 129: 179-181.
      • Ward, D.L., R.P. Marini, and R.E. Byers. 2001. Relationships among day of year of drop, seed content, and weight of mature apple fruit. HortScience 36:45-48.
      • Marini, R.P., J.A. Barden, and J.R. Schupp. 2001. Wind effects on apple in the eastern United States. HortScience 36 (2) .
      • Barden, J. A. and R.P. Marini. 2001. Comparison of methods to express growth, size, and productivity of apple trees. J. Amer. Pomol. soc. 55:251-256.
      • Marini, R.P. 2001. Estimating mean fruit weight and mean fruit value for apple trees: Comparison of two sampling methods with the true mean. J. Amer. Soc. Hort. Sci. 126:503-510.
      • Marini, R.P., B.H. Barritt, J.A. Barden, J. Cline, R.L. Granger, M.M. Kushad, M. Parker, R.L. Perry, T. Robinson, S. Khanizadeh, and C.R. Unrath. 2001. Performance of 'Gala' Apple on Eight Dwarf Rootstocks: Ten-Year Summary of the 1990 NC-140 Rootstock Trial. J. Amer. Pom. Soc. 55:197-204.
      • Marini, R.P., B.H. Barritt, J.A. Barden, J. Cline, E.E. Hoover, R.L. Granger, M.M. Kushad, M. Parker, R.L. Perry, T. Robinson, S. Khanizadeh, and C.R. Unrath. 2001. Performance of Ten Apple Orchard Systems: Ten -Year Summary of the 1990 NC-140 Systems Trial. J. Amer. Pom. Soc. 55:222-238.
        Ward, D.L., R.P. Marini, and R.E. Byers. 2001. Relationships among day of year of drop, seed content, and weight of mature apple fruit. HortScience 36: 45-48.
      • Marini, R.P., J. L. Anderson, W. R. Autio, B. H. Barritt, J. A. Cline, W. P. Cowgill, Jr., R. M. Crassweller, P. A. Domoto, D. C. Ferree, J. Garner, A. Gaus, G. M. Greene, C. Hampson, P. Hirst, M. M. Kushad, E. Mielke, C. A. Mullins, M. Parker, R. L. Perry, J. P. Privé, G. L. Reighard, T. Robinson, C. R. Rom, T. R. Roper, J. R. Schupp, E. Stover, and R. Unrath. 2000. Performance of 'Gala' apple on 18 dwarf rootstocks: Five-year Summary of the 1994 NC - 140 Dwarf Rootstock Trial. J. Amer. Pomol. Soc.. 54:92-107.
      • Marini, R.P., J. L. Anderson, W. R. Autio, B. H. Barritt, J. A. Cline, W. P. Cowgill, Jr., R. M. Crassweller, P. A. Domoto, D. C. Ferree, J. Garner, A. Gaus, G. M. Greene, C. Hampson, P. Hirst, M. M. Kushad, E. Mielke, C. A. Mullins, M. Parker, R. L. Perry, J. P. Privé, G. L. Reighard, T. Robinson, C. R. Rom, T. R. Roper, J. R. Schupp, E. Stover, and R. Unrath. 2000. Performance of 'Gala' apple on four semi-dwarf rootstocks: Five-year Summary of the 1994 NC - 140 Dwarf Rootstock Trial. J. Amer. Pomol. Soc. 54: 84-91.
      • Marini, R.P. and D.S. Sowers. 2000. Peach tree growth, yield, and profitability as influenced by tree form and tree density. HortScience 35:837 - 842.
      • Marini, R.P. 1999. Estimating apple diameter from fruit mass measurements to time thinning sprays. HortTechnology. 9:109-113.
      • Barden, J.A. and R.P. Marini. 1999. Rootstock effects on growth and fruit ing of a spur-type and a standard strain of 'Delicious' over eighteen years. Fruit Var. J. 53:115-125.
      • Marini, R.P. 1999. Are nonsignificant differences really not significant? HortScience 34:761-762.
      • Ward, D.L., E.P. Beers, R.E. Byers, and R.P. Marini. 1999. Cutting apple fruits induces cellulase activity in the abscission zone. HortScience 34:601-603.
      • Ward, D.L. and R.P. Marini. 1999. Growth and development of young apple fruits following application of ethephon plus carbaryl for thinning. HortScience 34:1057-1059.
      • Marini, R.P. and J.A. Barden. 1998. Incidence of diseases on foliage of nine apple genotypes as influenced by six fungicide treatments. Fruit Var. J. 52:136-143.
      • Barden, J.A. and R.P. Marini. 1998. Incidence of diseases on fruit of nine apple genotypes as influenced by six fungicide treatments. Fruit Var. J. 52:1128-136.
      • Barden, J.A. and R.P. Marini. 1997. Growth and fruiting of a spur-type and a standard strain of 'Golden Delious' on several rootstocks over eighteen years. Fruit Var. J. 51:165-175.
      • Barden, J.A. and R.P. Marini. 1997. Growth and cropping of young apple trees as affected by heading and support of the central leader. HortScience 33:39-41.
      • Marini, R.P. 1997. Oxamyl is an effective apple fruit thinner when used alone or when combined with other thinners. HortTechnology 8:71-74.

      • Marini, R.P. 1997. Oxamyl is an effective apple fruit thinner when used alone or when combined with other thinners. HortTech. 7:253-258.  

      •  

        Marini, R.P. 1996. Chemical thinning spur 'Delicious' apples with carbaryl, NAA, and ethephon at various stages of fruit development. HortTech. 6:241-246.
      • Welker,R.M*., R. P. Marini, and D.G. Pfeiffer. 1996.Ultrastructural and surface features of apple leaves following white apple leafhopper feeding. HortScience 31: 249-251. press.
      • Marini, R.P., D.S. Sowers, and M.C. Marini.1995. Tree form and heading            height at planting affect peach tree yield and crop value. HortScience                  31: In press.
      •  Welker*, R. M., R. P. Marini, and D. G. Pfeiffer.  1995. Influence of first generation white apple leafhopper (Homoptera: Cicadellidae), and leaf-to-fruit ration on   apple fruit size and quality.  J. Econ. Entomol. 88: In press. 
      • Byers, R. E. and R. P. Marini.  1994.  Influence of blossom and fruit thinning on peach flower bud tolerance to an early spring freeze.  HortScience 29:146-148.
      • Marini, R. P., D. G. Pfeiffer, and D. S. Sowers.  1994.  Influence of European red mite (Acari: Tetranychidae) and crop density on fruit size and quality and on crop value of 'Delicious' apples.  J. Econ. Entomol. 87:1301-1311.
      • Marini, R. P. and D. S. Sowers.  1994.  Peach fruit weight is influenced by crop density and fruiting shoot length but not position on the shoot.  J. Amer. Soc. Hort. Sci.  119:180-184.
      • Kaakeh, W., D.G. Pfeiffer, and R.P. Marini. 1993. Effects of Aphis  spiraecola    and A. pomi (Homoptera: Aphididae) on the growth of young apple trees.            Crop Protection 12:141-147.
      • Marini, R. P., J. A. Barden, and D. Sowers.  1993.  Growth and fruiting responses of  'Redchief Delicious' apple trees to heading cuts and scaffold limb removal.  J. Amer. Soc. Hort. Sci.  118:446-449.
      • Marini, R. P., R. E. Byers and D. L. Sowers.  1993.  Repeated applications of NAA  control preharvest drop of 'Delicious' apples.  J. Hort. Sci.  68:247-253.
      • Campbell*, R. J. and R. P. Marini.  1992.  Light environment and time of harvest affect 'Delicious' apple fruit quality charactertics.  J. Amer. Soc. Hort. Sci.  117:551-557.
      • Campbell*, R. J. and R. P. Marini.  1992.  Instantaneous light measurements predict relative cumulative light levels within an apple canopy.  J. Amer. Soc. Hort. Sci.  117:678-684.
      • Campbell*, R. J., R. P. Marini, and J. B. Birch.  1992.  Canopy position affects light response curves for gas exchange characteristics of apple spur leaves.  J. Amer. Soc. Hort. Sci.  117:467-472.
      • Kaakeh, W. D., D. G. Pfeiffer and R. P. Marini.  1992.  Combined effects of Spirea  Aphid (Homoptera:  Aphididae) and nitrogen fertilization on shoot growth, dry  matter accumulation, and carbohydrate concentration in young apple trees.  J. Econ. Entomol.  85:496-506.
      • Kaakeh, W. D., D. G. Pfeiffer, and R. P. Marini.  1992.  Combined effects of Spirea        Sphid ( Homoptera: Aphididae) and nitrogen fertilization on net photosynthesis,     total chlorophyll content, and greeness of apple leaves.  J. Econ. Entomol.     85:939-946.
      • Campbell*, R., R. Fell and R. Marini.  1992.  Canopy position, defoliation, and  girdling influence apple nectar production.  HortScience 26:531-532.
      • Marini, R. P. and D. Sowers.  1991.  Growth, yield, and fruit weight of spur-bound   'Delicious' apple trees following spur-pruning and BA plus GA4+7 application.  J. Amer. Soc. Hort. Sci.  116:454-459.
      • Marini, R. P., D. Sowers and M. C. Marini.  1991.  Peach fruit quality is affected by     shade during final swell of fruit growth.  J. Amer. Soc. Hort. Sci.  116:383-389.
      • Campbell,* R. J., R. Fell, and R. Marini. 1990.  Characterization of crab apple and apple nectar sugars.  Fruit Varieties Journal 44:136-141.
      • Campbell*, R. J., R. L. Grayson, and R. P. Marini.  1990.  Surface and ultrastructural feeding injury to strawberry leaves by the two spotted spider mite.  HortScience 25:948-951.
      • Campbell,* R. J., K. N. Mobley,* R. P. Marini, and D. G. Pfeiffer. 1990.  Growing conditions influence the relationship between the Spad 501 meter and total chlorophyll of apple leaves.  HortScience 25:330-331.
      • Campbell,* R. J., K. N. Mobley,* and R. P. Marini. 1990.  Growing conditions influence mite damage of apple and peach leaves.  HortScience 25: 445-448.
      • Campbell,* R. J. and R. P. Marini. 1990.  Nitrogen fertilization influences the physiology of apple leaves subjected to European red mite feeding.  J. Amer.  Soc.  Hort.  Sci. 115: 89-93.
      • Marini, R. P., R. E. Byers, D. L. Sowers, and R. W. Young. 1990.  Fruit abscission and fruit quality of apples as influenced by dicamba used to control preharvest drop.  J. Amer.  Soc.  Hort.  Sci. 115:390-394.
      • Marini, R. P. and D. L. Sowers. 1990.  Net photosynthesis, specific leaf weight and flowering of peach as influenced by shade.  HortScience 25:331-334.
      • Mobley, K.N.* and R.P. Marini. 1990. Gas exchange characteristics of apple and peach leaves infested by European red mite and twospotted spider mite. J. Amer. Soc. Hort.Sci. 115:757-761.
      • Marini, R. P., R. E. Byers, and D. Sowers. 1989.  Growth regulators and herbicides  for delaying apple fruit abscission.  HortScience 24:957-959.
      • Marini, R. and R. Byers. 1988.  Methods for evaluating chemical inhibitors of apple abscission.  HortScience 23:849-851.
      • Marini, R. P., R. E. Byers, D. Sowers, M. E. Marini, and R. W. Young. 1988.  Fruit abscission, fruit quality, and residue levels of dichlorprop used to control preharvest drop of apple.  HortScience 23:717-720.
      • Marini, R. P. 1987.  Growth and cropping of 'Redhaven' peach trees following soil  applications of paclobutrazol.  J. Amer.  Soc.  Hort.  Sci. 112:18-21.
      • Marini, R. P. 1986.  Growth and cropping of 'Redhaven' peach trees following foliar applications of flurprimidol and paclobutrazol.  J. Amer.  Soc.  Hort.  Sci. 111:849-853.
      • Hamilton, G. C., F. C. Swift, and R. Marini. 1986.  Effect of Aphis pomi (Homoptera: Aphididae) density on apples.  J. Econ.  Entomol. 79:471-478.
      • McClernan,*W. A. and R. P. Marini. 1986.  Effects of European red mite on yield, fruit quality, and growth of peach trees.  HortScience 21:244-246.
      • Gianfagna, T. J., R. P. Marini, and S. Rachmiel. 1986.  Effect of ethephon and GA on time of flowering in peach.  HortScience 21:69-70.
      • Marini, R. P. 1986.  Defoliation, flower bud cold hardiness, and bloom date of peach as influenced by three pruning treatments.  J. Amer.  Soc.  Hort.  Sci. 111:391-394.
      • Marini, R. P. 1986.  Do net gas exchange rates of green and red peach leaves differ? HortScience 21:118-120.
      • Marini, R. P.1985.  Sample size estimates for peach growth and yield experiments. J.Amer.  Soc.  Hort.  Sci. 110:604-608.
      • Marini, R. P.and D. Rossi. 1985.  A partial economic analysis comparing dormant    pruning, summer pruning, and summer topping of mature 'Sunqueen' peach trees. HortScience 20:242-243.
      • Marini, R. P. 1985.  Vegetative growth, yield, and fruit quality of peach as influenced by dormant pruning, summer pruning, and summer topping.  J. Amer.  Soc. Hort.  Sci. 110:133-139.
      • Trout, J. R. and R. P. Marini. 1984.  Estimating sample size to achieve efficient  experiment designs.  HortScience 19:13-16.
      • Marini, R. P. and J. R. Trout. 1984.  Sampling procedures for minimizing variation in peach fruit quality.  J. Amer.  Soc.  Hort.  Sci. 109:361-364.
      •   Marini, R. P. 1983.  Rooting of semi-hardwood peach cuttings as affected by original  shoot position and stem thickness.  HortScience 18:718-719.
      • Marini, R. P. and M. C. Marini. 1983.  Seasonal changes in specific leaf weight, net    photosynthesis, and chlorophyll content of peach leaves as affected by light penetration and canopy position.  J. Amer.  Soc.  Hort.  Sci. 108:609-613.
      • Marini, R. P. and J. A. Barden. 1983.  Translocation of C14-photosynthate in one-year-old apple trees following summer pruning.  HortScience 18:926-929.
      • Choma, M. E., J. L. Garner, R. P. Marini, J. A. Barden. 1982.  The effect of fruiting on net photosynthesis and dark respiration of 'Hecker' strawberry.  HortScience 17:212-213.
      • Marini, R. P. and J. A. Barden. 1982.  Seasonal correlations of specific leaf weight to net photosynthesis and dark respiration of apple leaves.  Photosynthesis Research 2:251-258.
      • Marini, R. P. and J. A. Barden. 1982.  Effects of summer vs dormant pruning and NAA treatment on growth of one- and two-year old apple trees.  J. Amer.  Soc.  Hort.  Sci. 107:604-607.
      • Marini, R. P. and J. A. Barden. 1982.  Yield, fruit size, and quality of three apple cultivars as influenced by summer or dormant pruning.  J. Amer.  Soc.  Hort.  Sci. 107:474-479.
      • Marini, R. P. and J. A. Barden. 1982.  Net photosynthesis, dark respiration, transpiration, and stomatal resistance of young and mature apple trees as influenced by summer or dormant pruning.  J. Amer.  Soc.  Hort.  Sci. 107:170­174.
      • Marini, R. P. and J. A. Barden. 1982.  Light penetration on overcast and clear days, and specific leaf weight in apple trees as affected by summer or dormant pruning. J. Amer.  Soc.  Hort.  Sci. 107:39-43.
      • Marini, R. P. and J. A. Barden. 1982.  Growth and flowering of vigorous apple trees as affected by summer or dormant pruning.  J. Amer.  Soc.  Hort.  Sci. 107:34- 39.
      • Barden, J. A., J. M. Love, P. J. Porpiglia, R. P. Marini, and J. D. Caldwell. 1980.  Net   photosynthesis and dark respiration of apple leaves are not affected by shoot detachment.  HortScience 15:595-597.
      • Marini, R. P. and B. R. Boyce. 1979.  Influence of low temperatures during dormancy on growth and development of 'Catskill' strawberry plants.  J. Amer.  Soc.  Hort. Sci. 104:159-162.
      • Boyce, B.R. and R.P. Marini. 1978. Cold acclimation of everbearing strawberry blossoms. HortScience 13:543-544.
      • Marini, R. P. and B. R. Boyce. 1977.  Susceptibility of crown tissues of 'Catskill' strawberry plants to low-temperature injury.  J. Amer.  Soc.  Hort.  Sci. 102:515­516.