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Mark Hoffmann

Department of Horticultural Science

Assistant Professor / Small Fruits Extension Specialist

Kilgore Hall 258

Bio

Appointment:

70 % Extension / 30 % Research

Grape, Muscadine and Strawberry Production in North Carolina

Education

Post-Doctoral Researcher University of California Davis 2017

Post-Doctoral Researcher University of Florida 2014

Ph.D. Biology University of Mainz, Germany 2011

M.S. Biology University of Mainz, Germany 2007

B.S. Biology University of Mainz, Germany 2002

Publications

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Grants

Date: 09/01/21 - 8/31/25
Amount: $5,294,195.00
Funding Agencies: US Dept. of Agriculture - National Institute of Food and Agriculture (USDA NIFA)

The capacity of strawberry nurseries to develop clean plant material in a timely manner is crucial to the $ 2.6 billion US strawberry production industry. However, strawberry propagation in North America is a costly multi-year and multi-location operation, leading to a multitude of challenges: (a) Dependency on methyl bromide (MB) for soil disinfestation; (b) Plants as symptomless carriers of plant pathogens; (c) Significant inefficiencies, leading to higher costs for duplicative infrastructure, equipment, labor costs and transportation; There is a critical need for the strawberry nursery industry to reduce overall costs, minimize the spread of pathogens and find alternatives to MB. We propose to address these needs through a coordinated and systematic approach in close collaboration with national and international stakeholders. We have the long-term goal to accelerate the development of optimized, clean propagation techniques, using precise indoor propagation (PIP) practices and genetic tools. Our specific objectives are (1) Development of PIP protocols to optimize strawberry propagation; (2) Determine plant propagation capacity using genetic and morphological tools; (3) Determine socio-economic structure and supply chain of the US strawberry industry; (4) Develop fully functional PIP system and transfer technology into on-farm solutions. We propsoe to develop nursery specific services, products and on-farm technology, and we will extent our research through a multitude of activities, including yield prediction tools for strawberry farmers in the US. The main outcome of this project is the development of cost-effective strawberry propagation systems, leading to reduced use of MB and the mitigation of diseases and pathogen spread.

Date: 02/01/23 - 1/31/24
Amount: $29,829.00
Funding Agencies: NC Department of Agriculture & Consumer Services

We ask for funding to support the ongoing efforts of the NCSU viticulture research and extension program. These include in detail: (1) Evaluation of muscadine and PD resistant grape cultivars in NC; (2) Development of in-person and virtual workshops and field days on grape management with a focus on pruning, training and Pierce's Disease Management; (3) Evaluation of Ellagic Acid content in a variety of muscadine cultivars across NC.

Date: 01/01/22 - 12/31/23
Amount: $54,190.00
Funding Agencies: US Dept. of Agriculture - Agricultural Marketing Service (USDA AMS)

The North Carolina (NC) strawberry industry is the largest in the Southeast and the third largest in the country. However, the NC strawberry experienced a significant decline in farm gate value in the past years, despite the consistent consumer demand for fresh strawberries nationwide. The reduced resilience in NC strawberry production can be explained by several factors: (1) increased labor costs; (2) increased national and international market competition; (3) frequent unfavorable weather events; (4) pest and disease problems, leading to significant losses; and (5) increasing consumer demand for organically produced strawberries. Those issues implicate a significant need for alternative strawberry production systems in NC. Here we propose to investigate the use of soilless strawberry production systems for NC, hypothesizing that soilless systems can be used to produce strawberries over an extended season, reduce pest pressure, increase yields and fruit quality. We aim to develop a scientific base on the use of substrates for strawberry production, focusing on yield and fruit quality of commonly grown strawberry cultivars in NC. The following objectives will be investigated: (a) Impact of soilless organic substrate use on disease and weed control efficacy, yield, and fruit quality in strawberry plasticulture systems; (b) Optimization of substrate types on fruit quality and yield of common strawberry cultivars. (c) Development of a strawberry greenhouse budget. (d) Development of a strawberry greenhouse production guide for North Carolina. The results of this study will be disseminated to stakeholders through online media (webinars, websites), grower meetings and field days.

Date: 01/01/22 - 12/31/23
Amount: $100,000.00
Funding Agencies: US Dept. of Agriculture - Agricultural Marketing Service (USDA AMS)

Muscadine grapes, unique to the warmer parts of the United States, are generally consumed regionally. Expansion of the market has happened slowly and shipments to Canada have had successful consumer interest. In trial shipments, it was found that Asian markets will pay a premium price for large size, purple colored muscadine grapes and there is interest in sending muscadine shipments to Hong Kong. This entails a minimum 4-6 week journey by sea; muscadine shelf life is currently 2 to 4 weeks when held at 36-41 F. Lab-based experiments with two muscadine cultivars using high carbon dioxide (10-30%) and reduced oxygen (4-6%) and refrigerated storage slowed decay and softening of muscadines and maintained grape color. In order to effectively use this system to transport grapes to Asia, an experiment using much larger amounts has to be tested using refrigerated storage combined with high carbon dioxide and low oxygen. In this proposal, we will test three varieties of purple muscadines using a controlled atmosphere storage at a larger scale (600 pounds of fruit per variety rather than 3 pounds). Small scale experiments will also be conducted to evaluate another 6-10 fresh market muscadine varieties to see if this technology will also help extend the muscadine marketing season in the U.S.

Date: 01/01/22 - 12/31/23
Amount: $85,840.00
Funding Agencies: US Dept. of Agriculture - Agricultural Marketing Service (USDA AMS)

We propose to develop research protocols, tools and techniques fundamental to the development of Precise Indoor Vine Conditioning (PIVC) technology at NC State University. We envision PIVC to use Controlled Environment (CE) and data technology to optimize fruiting capacity of vines, leading to game-changing systems of perennial fruit production. PIVC would allow to grow traditionally perennial crops as fully annual culture, as well as the use of vines as ‘starter plants’. Such a system would address major concerns of stakeholders and persistent problems in the fruit growing industry, leading to improved economics and cost recovery, less pesticide and labor input, and improved adaptability to markets. Our objectives are to investigate light recipes, fruiting capacity and economics of PIVC treated vines, while developing collaborations, involving nationwide stakeholders, leading to funded multi-state, national research and extension projects in the future. The outcome of this project are environmental protocols and tools, ready to be used by industry.


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