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Information on Tree Diseases & Future Disease Expectations
Speaker: Dr. David Appel, Biological Control Texas A&M

Session: Tree Care & Arborist Track -- Information on Current Tree Diseases & Future Disease Expectations

Thursday, August 5  8:00 AM - 9:00 AM .... CEU: TNLA 1. ISA 1

This presentation will bring to light current tree diseases found in Texas and give updates on these diseases and what to look for. Attendees will also learn expectations on what specialists are looking at for future diseases and how property managers can begin creating their management process. CEUs Available: TNLA, ISA, SAF Sponsored by Rainbow Treecare Scientific Advancements

Dr. David N. Appel

Professor, Biological Control ... Department of Plant Pathology and Microbiology
Graduate Education
Ph.D. Plant Pathology, Virginia Tech, 1981
Courses Taught
PLPA 301 Plant Pathology
PLPA 626 Diagnosis of Plant Diseases
FRSC 307 Forest Protection
BESC 489 Special topics in Principals of Environmental Regulations

Research Emphasis: 

Forest Pathology
The following report describes three of the primary activities in the Forest Pathology Lab. The common theme of these activities is improving our understanding of the epidemiology of plant pathogens to make better disease management decisions.

Oak Wilt: The primary components of the project included an infectious forest disturbance (oak wilt, caused by Ceratocystis fagacearum), an indicator of forest health (the endangered avian species, the golden cheeked warbler), and their coexistence in a large tract of Central Texas savannah located within the Ft. Hood Military Installation, TX. The impact of oak wilt on the golden cheeked warbler (GCW) habitat utilizing remote sensing, a Geographic Information System (GIS) and geostatistical analyses is being analyzed. The spatial patterns of disease incidence are related to numerous independent variables using binary decision trees, semivariograms and kriging to create surface maps useful in predicting disease development. These studies will provide landowners and natural resource managers with better information on which to make disease management decisions.

Pierce’s Disease: The epidemiology of Pierce’s disease of grapes depends, in part, on vector behavior, inoculum sources, and the grape cultivars being infected. The colonization of different grape cultivars is being studied in containerized vines by inoculating them with different pathogen strains and assaying for the growth of the bacterium throughout the plants for a year following inoculation. Direct isolation, ELISA, and real time PCR are being used to study colonization and to compare the efficiency of each diagnostic technique. Sequential disease development within different vineyards is being surveyed to study the spread of the pathogen into, and within, vineyards. The spatial patterns of disease incidence and levels of disease severity are being analyzed.

Sudden Oak Death: The SOD pathogen apparently has been disseminated throughout the United States from contaminated nurseries in California during the past 2 years. The Forest Pathology Lab is involved in 3 different surveys within, and around, nurseries in Texas. One of the surveys involve those nurseries receiving plant materials from the contaminated CA nursery (trace forward survey) while the others include a sample of nurseries from throughout the state. Symptomatic plants from regulated host species are being processed the lab using direct isolation, ELISA and PCR to detect the pathogen.

The World is Our Campus!  
Horticulture encompasses a unique blend of art, science, and technology. The Texas A&M Department of Horticultural Sciences offers two undergraduate and three graduate degrees that prepare students for a myriad of diverse career opportunities.

Address:     TAMU 2133 College Station, TX 77843-2133
Email:    hortweb@tamu.edu     Contact:  
Phone:    979.845.5341   FAX:  979.845.0627


Tree Health Care Solutions Developed for Arborists by Arborists
Rainbow Treecare Scientific Advancements is committed to developing reliable tools and protocols to benefit arborist practitioners and the tree health care industry. We achieve this goal as a company by investing our profits into University level independent research, education and training programs, and technical support. By serving the arborist practitioner with the best tools in the industry, we in turn enhance the professionalism of arborists nationwide.

Address:     11571 K Tel Dr. Minnetonka, MN 55343
Email:    info@treecarescience.com     Contact:  
Phone:    (877) 272-6747   FAX: 


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