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Bruce Schaffer

Specialist

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Bruce Schaffer

Orcid ID0000-0001-9379-0109

Specialist

profesor, ecofisiología de cultivos hortícolas subtropicales y tropicales, Department of Horticultural Sciences, UF/IFAS Tropical Research and Education Center, Homestead, FL

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Publications

thumbnail for publication: Evapotranspiration-Based Irrigation for Agriculture: Sources of Evapotranspiration Data for Irrigation Scheduling in Florida

Evapotranspiration-Based Irrigation for Agriculture: Sources of Evapotranspiration Data for Irrigation Scheduling in Florida

Isaya Kisekka, Kati W. Migliaccio, Michael D. Dukes, Bruce Schaffer, Jonathan H. Crane, Kelly Morgan, Haimanote K. Bayabil, and Sandra M. Guzman

This article is part of a series on ET-based irrigation scheduling for agriculture. The rest of the series can be found at https://edis.ifas.ufl.edu/topic_series_ET-based_irrigation_scheduling_for_agriculture.

thumbnail for publication: Recomendaciones para el Control y Mitigación de la Marchitez del Laurel y sus Vectores, los Escarabajos Ambrosia, en Arboledas Comerciales de Aguacate en Florida

Recomendaciones para el Control y Mitigación de la Marchitez del Laurel y sus Vectores, los Escarabajos Ambrosia, en Arboledas Comerciales de Aguacate en Florida

Jonathan H. Crane, Daniel Carrillo, Edward A. Evans, Romina Gazis, Bruce Schaffer, Fredy Ballen, y Jeff Wasielewski Traducido por Rubén Regalado. Revisado por Dr. Carlos F. Balerdi

El control del complejo agente patógeno ML - EA es difícil debido a la posibilidad de que ocurra una transmisión rápida por injertos de raíces, por nuevas infestaciones de ML debido al movimiento del EA, y a las dificultades y costos de las tácticas de control existentes. Las investigaciones en curso tienen como objetivo lograr un conocimiento más profundo de la biología del agente patógeno de la ML y el EA capaz de transmitirlo, de la epidemiología (dinámica de la dispersión de la enfermedad), y desarrollar métodos de control y tácticas de mitigación más eficaces. Las recomendaciones de control serán revisadas tan pronto se conozca información adicional.

thumbnail for publication: Recommendations for Control and Mitigation of Laurel Wilt and Ambrosia Beetle Vectors in Commercial Avocado Groves in Florida

Recommendations for Control and Mitigation of Laurel Wilt and Ambrosia Beetle Vectors in Commercial Avocado Groves in Florida

Jonathan H. Crane, Daniel Carrillo, Edward A. Evans, Romina Gazis, Bruce Schaffer, Fredy Ballen, and Jeff Wasielewski

Control of the LW pathogen–AB complex is challenging due to the potential for rapid root-graft transmission, new LW infestations caused by AB movement, and the difficulty and expense of current control tactics. Ongoing research is aimed at further understanding of the biology of the pathogen and secondary AB capable of transmitting the LW pathogen, epidemiology (spread dynamics of the disease), and development of more efficient control and mitigation tactics. As more information is developed, control recommendations will be revised.

thumbnail for publication: Sampling Guidelines and Recommendations for Submitting Samples for Diagnosing Laurel Wilt in Avocado Trees (Persea americana L.)

Sampling Guidelines and Recommendations for Submitting Samples for Diagnosing Laurel Wilt in Avocado Trees (Persea americana L.)

Jonathan Crane, Romina Gazis, Jeff Wasielewski, Daniel Carrillo, Bruce Schaffer, Fredy Ballen, and Edward Evans

Laurel wilt (LW) is a vascular disease caused by a fungal pathogen, Raffaelea lauricola, which is transmitted to avocado trees by several ambrosia beetle species or through root grafts among adjacent avocado trees. Laurel wilt is a highly destructive disease that ultimately results in tree death; therefore, early detection and tree removal to prevent its spread is recommended. Diseased or symptomatic trees are best identified by continuous and regular grove scouting, which should be a normal grove management activity. This may go a long way to manage the disease and remain in business.

thumbnail for publication: Evapotranspiration-Based Irrigation for Agriculture: Implementing Evapotranspiration-Based Irrigation Scheduling for Agriculture

Evapotranspiration-Based Irrigation for Agriculture: Implementing Evapotranspiration-Based Irrigation Scheduling for Agriculture

Isaya Kisekka, Kati W. Migliaccio, Michael D. Dukes, Jonathan H. Crane, Bruce Schaffer, Haimanote K Bayabil, and Sandra M Guzman

This publication outlines step-by-step procedures for implementing a "smart" ET-based irrigation schedule and a do-it-yourself irrigation schedule. A numerical example is provided on how to implement a do-it-yourself ET-based irrigation schedule.

thumbnail for publication: Recommendations for the Detection and Mitigation of Laurel Wilt Disease in Avocado and Related Tree Species in the Home Landscape

Recommendations for the Detection and Mitigation of Laurel Wilt Disease in Avocado and Related Tree Species in the Home Landscape

Jonathan H. Crane, Jeff Wasielewski, Daniel Carrillo, Romina Gazis, Bruce Schaffer, Fredy Ballen, and Edward Evans

Avocado trees are a popular choice for homeowners in Florida, with over 600,000 growing in Florida home landscapes. However, avocado trees as well as others in the Lauraceae family are susceptible to laurel wilt disease, which can kill a tree in as few as three weeks.

thumbnail for publication: Evapotranspiration-Based Irrigation for Agriculture: Crop Coefficients of Some Commercial Crops in Florida

Evapotranspiration-Based Irrigation for Agriculture: Crop Coefficients of Some Commercial Crops in Florida

Isaya Kisekka, Kati W. Migliaccio, Michael D. Dukes, Jonathan H. Crane, Bruce Schaffer, Sandra M. Guzman, and Haimanote K. Bayabil

This publication identifies typical Kc values for some of the crops commonly grown in Florida. The Kc values listed are only intended for use as guidelines in the absence of locally developed, variety-specific Kc values.

thumbnail for publication: Recomendaciones para la Detección y Mitigación de la Marchitez del Laurel en Árboles de Aguacates y Especies Relacionadas en Jardines y Patios Hogareños

Recomendaciones para la Detección y Mitigación de la Marchitez del Laurel en Árboles de Aguacates y Especies Relacionadas en Jardines y Patios Hogareños

Jonathan H. Crane, Jeff Wasielewski, Daniel Carrillo, Romina Gazis, Bruce Schaffer, Fredy Ballen, y Edward Evans Traducido por Rubén Regalado; Revisado por Dr. Carlos F. Balerdi

Los aguacates cultivados en patios y jardines son disfrutados y apreciados por cientos de residentes de Florida. Además de proveer sus frutos, estos árboles ofrecen un hábitat para la vida silvestre y sombra en las áreas urbanas. Existen aproximadamente 600,000 árboles de aguacates en los patios y jardines de Florida. La mayoría de estos árboles se encuentran en los condados de Miami-Dade, Broward, Palm Beach, y Lee en el sur de la Florida, pero también se encuentran en muchos de los condados centrales de Florida.

thumbnail for publication: Managing Your Tropical Fruit Grove under Changing Water Table Levels

Managing Your Tropical Fruit Grove under Changing Water Table Levels

Jonathan H. Crane, Carlos F. Balerdi, and Bruce Schaffer

This fact sheet has been prepared by IFAS faculty working with tropical fruit crops in an effort to assist growers manage their groves under conditions of flooding, high water tables, or drought. Although weather events cannot be controlled, becoming familiar with the effects of a high water table, flooding, or drought on tropical fruit crops may assist growers in managing their fruit trees so they survive these events with minimal or no damage. However, this process will be impacted by ground water levels, which are managed in south Florida, and thus are dependent on regional water management decisions. 

thumbnail for publication: Quick Guide to Environmental Factors Impacting Subtropical and Tropical Fruit Crops in Florida

Quick Guide to Environmental Factors Impacting Subtropical and Tropical Fruit Crops in Florida

Jonathan H. Crane, Bruce Schaffer, Young Gu Her, Haimanote Bayabil, Jeff Wasielewski, and Clyde Fraisse

Commercial tropical fruit crop acreage is expanding in Florida outside the traditional extreme south Florida and coastal counties. This largely results from the significantly warmer climate, less frequent freezing events, and less severity and duration of freezing events throughout the state, especially south-central counties. In addition, as the loss of citrus acreage continues, citrus growers and entrepreneurs are seeking alternative crops to remain in business. The successful establishment and maintenance of tropical and subtropical fruit crops in Florida depend on the crop’s tolerance to critical abiotic factors, including tolerance to flooded or waterlogged soil conditions, its ability to withstand high soil and irrigation water salinity, and its high and low temperature ranges for growth, flowering, and production. This publication aims to provide an understanding of the impacts of environmental factors on subtropical and tropical fruit crops grown in Florida.

thumbnail for publication: Evapotranspiration-Based Irrigation Scheduling for Agriculture

Evapotranspiration-Based Irrigation Scheduling for Agriculture

Isaya Kisekka, Kati W. Migliaccio, Michael D. Dukes, Bruce Schaffer, Jonathan H. Crane, Haimanote K. Bayabil, and Sandra M. Guzman

A UF/IFAS numbered Fact Sheet. Published by Agriculture Water

thumbnail for publication: Achachairu (Garcinia humilis), árbol frutal: botánica y cultivo comercial en el sur de Florida

Achachairu (Garcinia humilis), árbol frutal: botánica y cultivo comercial en el sur de Florida

Federico W. Sanchez, Jonathan H. Crane, Haimanote Bayabil, Ali Sarkhosh, Muhammad A. Shahid y Bruce Schaffer

Este documento provee información sobre las características y botánica del achachairu así como las prácticas horticulturales recomendadas para productores comerciales y profesionales de Extensión tanto del condado como del estado de Florida. Esta información también está destinada a dueños de casas y estudiantes interesados en cultivar achachairu.

thumbnail for publication: Saltwater Intrusion and Flooding: Risks to South Florida’s Agriculture and Potential Management Practices

Saltwater Intrusion and Flooding: Risks to South Florida’s Agriculture and Potential Management Practices

Haimanote K. Bayabil, Yuncong Li, Jonathan H. Crane, Bruce Schaffer, Ashley R. Smyth, Shouan Zhang, Edward A. Evans, and Trent Blare

This article highlights the impacts of saltwater intrusion and flooding on the health of agricultural soils. It also discusses management practices to reduce the negative impacts of soil salinity due to saltwater intrusion and/or flooding. Written by Haimanote K. Bayabil, Yuncong Li, Jonathan H. Crane, Bruce Schaffer, Ashley R. Smyth, Shouan Zhang, Edward A. Evans, and Trent Blare, and published by the UF/IFAS Department of Agricultural and Biological Engineering, May 2022.

thumbnail for publication: Achachairu (Garcinia humilis) Fruit Trees: Botany and Commercial Cultivation in South Florida

Achachairu (Garcinia humilis) Fruit Trees: Botany and Commercial Cultivation in South Florida

Federico W. Sanchez, Jonathan H. Crane, Haimanote Bayabil, Ali Sarkhosh, Muhammad A. Shahid, and Bruce Schaffer

This article provides detailed information on the achachairu’s characteristics, botany, and recommended horticultural practices for commercial growers and county and state Extension faculty in south Florida and is also applicable for homeowners and students interested in growing achachairu. Written by Federico W. Sanchez, Jonathan H. Crane, Haimanote Bayabil, Ali Sarkhosh, Muhammad A. Shahid, and Bruce Schaffer, and published by the UF/IFAS Horticultural Sciences Department, March 2024.

thumbnail for publication: Measuring Leaf Water Potential

Measuring Leaf Water Potential

Christian Bartell, Haimanote K. Bayabil, Bruce Schaffer, Fitsum Tilahun, and Fikadu Getachew

This article summarizes the basic concepts of leaf water potential measurements and two available methods for measuring leaf water potential under field and laboratory conditions. Written by Christian Bartell, Haimanote K. Bayabil, Bruce Schaffer, Fitsum Tilahun, and Fikadu Getachew, and published by the UF/IFAS Department of Agricultural and Biological Engineering, October 2021.