Thursday, July 13, 2017

New and Revised Agriculture Publications, May and June 2017

Here are the new and revised #EDISpubs in the Agriculture program area from May and June 2017.


·         Crops: fertilizer use, herbicide residues, evaluating soil health

·         Citrus: three new ID fact sheets, Indian River grapefruit production costs, managing HLB-infected groves

·         Forestry: carbon stocks and wildlife species conservation

·         Livestock: 2 on horse gaits and genetics

·         Nursery & Greenhouse: powdery mildew on nasturtium, whitefly management

·         Pesticide information: WPS respirators

·         Turfgrass: nematodes residential lawns



Calibrating Time Domain Reflectometers for Soil Moisture Measurements in Sandy Soils

The UF/IFAS Plant Science Research and Education Unit (PSREU) in Citra, FL developed an in-laboratory calibration protocol for CS616 TDR sensors for sandy soils, which are typical of north central Florida. This new 7-page fact sheet discusses the reflectometer, field site, calibration protocol, and calibration coefficients. Written by Tara Bongiovanni, Pang-Wei Liu, Daniel Preston, Johanna Montanez, Courtnay Cardozo, Steven Feagle, and Jasmeet Judge, and published by the UF Department of Agricultural and Biological Engineering, February 2017.



Florida Fertilizer Usage Statistics

Nutrient applications are often required to meet Florida’s demand for agricultural and horticultural commodities, but often those applications occur in close proximity to water bodies. In order for scientists, policy makers, and citizens to make decisions regarding nutrient issues in Florida, it is important to first understand which markets contribute to Florida’s fertilizer consumption. This three-page fact sheet explains Florida’s fertilizer usage statistics. Written by T.W.Shaddox and published by the Environmental Horticulture Department.

Herbicide Residues in Manure, Compost, or Hay

When purchasing compost, it is important to understand that some manure-based products can contain herbicide residues that can affect the growth of certain plants. Manure from animals that have been fed forage treated with aminopyralid or other closely related herbicides, such as clopyralid or picloram, can be contaminated with these herbicides, which severely restrict the growth of legume and solanaceous crops and other broadleaf plants. This 3-page fact sheet discusses aminopyralid, compost, questions to ask when purchasing bulk compost or mulch, conducting a bioassay, aminopyralid injury symptoms, and steps to consider if contaminated manure or compost has been added to a garden or field site. Written by Jason Ferrell, Peter Dittmar, and Brent Sellers, and published by the UF Agronomy Department, May 2017.

Tools for Evaluating Soil Health

Soil health is a term synonymous with soil quality. It refers to the chemical, biological, and physical characteristics that influence a soil’s ability to function sustainably and to satisfy the needs of humans, support plants, and cycle elements, water, and energy between earth systems. This four-page fact sheet identifies ways to evaluate soil health. Written by Jehangir H. Bhadha, Jay Capasso, Robert S. Schindelbeck, and Allan R. Bacon and published by the Department of Soil and Water Sciences.

Yield Mapping Hardware Components for Grains and Cotton Using On-the-Go Monitoring Systems

This 12-page fact sheet discusses yield mapping benefits, grain yield flow sensors, grain moisture sensors, cotton yield flow sensors, differential GNSS receivers, ground speed sensors, header position sensors, computer displays, yield calculation and calibration, and costs of yield mapping hardware components. Written by Rebecca Barocco, Won Suk Lee, and Garret Hortman, and published by the UF Department of Agricultural and Biological Engineering, February 2017.


Citrus Fruit Disorders and Physical/Chemical Injuries

This new one-page Citrus Identification fact sheet illustrates different disorders and injuries that affect citrus. Written by Mark A. Ritenour, Jamie D. Burrow, Megan M. Dewdney, and John Zhang and published by the Horticultural Sciences Department.

Citrus Fruit Blemishes and Decay Caused by Fungi and Bacteria

This new one-page citrus identification fact sheet illustrates different blemishes from fungi and bacteria that affect citrus. Written by Mark A. Ritenour, Jamie D. Burrow, Megan M. Dewdney, and John Zhang and published by the Horticultural Sciences Department.

Citrus Nutrition Management Practices

A new two-page fact sheet has been published by the Horticultural Sciences Department and the UF/IFAS Citrus Research and Education Center about citrus nutrition management practices. It was written by J.D. Burrow, T. Vashisth, M. Zekri, S.H. Futch, and A. Schumann.

Cost of Production for Fresh Grapefruit Grown in Indian River, 2015/16

This 4-page article written by Ariel Singerman and published by the Food and Resource Economics Department presents the cost of production per acre for growing fresh grapefruit in the Indian River region during 2015/2016, based on a survey of growers conducted at the Indian River Citrus League production committee meeting in mid-July 2016. The cost estimates do not represent any individual operation; rather, their purpose is to serve as a benchmark for the industry. Typical users of these estimates include growers, consultants, property appraisers, and researchers.

Managing the Health and Productivity of HLB-Affected Groves

After years of extensive research from across the world, we still do not have a cure for HLB; however, we have learned a lot about this disease, the plant’s response to the disease, and the disease vector. Based on scientific and observational information gathered in the last decade, a number of tools and strategies are currently available for growers to maintain the health and productivity of HLB-affected trees. This four-page fact sheet will shed light on these currently available horticultural inputs and practices that can be implemented immediately by growers to maintain and improve citrus tree health.Written by Tripti Vashisth and published by the Horticultural Sciences Department.

Forest Resources

Carbon Stocks on Forest Stewardship Program and Adjacent Lands

Nonindustrial private forestlands in Florida provide many environmental benefits, or ecosystem services. Ecosystem services are benefits from nature that are directly enjoyed, consumed, or used by humans, such as water quality improvement or protection, recreation, biodiversity, and even timber. Another benefit from forests that is gaining interest is their ability to store carbon through the photosynthetic capture of carbon dioxide, a greenhouse gas, in tree, plant, and soil biomass. The carbon dioxide that is stored over the life of a forest, called carbon stocks, is not only important for mitigating greenhouse gas contributions to climate change, but it can also be valued in several markets and incorporated into environmental policy instruments. This 5-page fact sheet was written by Nilesh Timilsina, Francisco J. Escobedo, Alison E. Adams, and Damian C. Adams and published by the UF Department of School of Forest Resources and Conservation April 2017.

The Value of Private Non-Industrial Forestland for Wildlife Species Conservation

Animals in Florida provide a variety of benefits to people, from recreation (fishing, hunting, or wildlife viewing) to protection of human life and property (oysters and corals provide reef structures that help protect coasts from erosion and flooding). By measuring the economic value of these benefits, we can assign a monetary value to the habitats that sustain these species and assess the value that is lost when development or other human-based activities degrade animal habitat. This 5-page fact sheet written by Shelly Johnson, Timm Kroeger, Josh Horn, Alison E. Adams, and Damian C. Adams and published by the School of Forest Resources and Conservation presents the results of a study that assessed the value of protecting five animal species in Florida and showed the economic value of protecting animal habitat.


Galloping into the Future: Genetic Tips and Tools for the Horse Owner

This 4-page fact sheet discusses the equine genome, determining the genotype of a horse, breeding for certain traits, and the future of genetic tools. Written by Laura Patterson Rosa, Carissa Wickens, and Samantha A. Brooks, and published by the UF Department of Animal Sciences, May 2017.

Genetic Selection for Gaits in the Horse

Quality and cadence of various locomotion patterns are extremely valuable traits in horses. Breeds like the Tennessee Walking Horse, Florida Cracker Horse, Mangalarga marchador, and Icelandic Pony are prized and selected for unique intermediate-speed locomotion patterns. What if genetics could help us unravel and better select for the locomotion patterns of our horses? This 4-page fact sheet discusses the connection between locomotion patterns and genetics, DMRT3 and locomotion in the horse, improvement of understanding of the gene function of DMRT3, and current as well as future applications. Written by Laura Patterson Rosa, Carissa Wickens, and Samantha A. Brooks, and published by the UF Department of Animal Sciences, May 2017.

Nursery & Greenhouse

Powdery Mildew on Nasturtium in South Florida

Powdery mildew, which is caused by the fungus Leveillua rutae (syn. Oidiopsis haplophylli) on nasturtium (Tropaeolum majus L.), was found in southwest Florida for the first time in 2015 (Fayette et al. 2016). This two-page fact sheet describes the pathogen, its symptoms, and how to manage it. Written by Pamela D. Roberts, Katherine E. Hendricks, Francesco Di Gioia, Joubert Fayette, and Monica Ozores-Hampton and published by the Plant Pathology Department.

Whitefly (Bemisia tabaci) Management Program for Ornamental Plants

Silverleaf whitefly is one of the most notorious invasive arthropods worldwide. It feeds on more than 900 plant species and vectors over 100 plant-damaging viruses. This 10-page fact sheet written by Vivek Kumar, Cristi Palmer, Cindy L. McKenzie, and Lance Osborne and published by the Department of Entomology and Nematology provides management recommendations, strategies for detection and scouting, and advice about control measures for this pernicious pest.

Pesticide Information

Worker Protection Standard: Respirators

On November 2, 2015, the EPA revised the WPS, making significant changes to the rule’s requirements. Most of the revised provisions became effective January 2, 2017; there are four provisions that are delayed until January 2, 2018. This four-page document will address respirator use under the revised WPS. Written by Frederick M. Fishel and published by the Agronomy Department and the Pesticide Information Office.


Nematode Management in Residential Lawns

Plant-parasitic nematodes are among the least understood and most difficult pests to manage on turfgrass in Florida. They are very small, and most can only be seen with the aid of a microscope. They use a stylet to puncture plant cells, to inject digestive juices into them, and to ingest plant fluids. The most reliable way to determine whether plant-parasitic nematodes are involved in a turf problem is to have a nematode assay conducted by a professional nematode diagnostic lab. This 6-page fact sheet was written by William T. Crow, and published by the UF Department of Entomology and Nematology.






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