Monday, March 11, 2019 at 10:00 AM CDT
Tuesday, March 12, 2019 at 3:00 PM CDT

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TAMU Plant Diagnostic Lab 
1500 Research Parkway Suite 130A
College Station, TX 77845

Driving Directions 


$250 Texas Chapter ISA Member
$295 Non-Member ISAT 



Certified Arborist 12.5
Municipal Specialist 12.5
BCMA Science 12.5


Gene Gehring 
Texas Chapter International Society of Arboriculture 

Your Instructors

Dr. David Appel

Dr. Appel is a professor in the Department of Plant Pathology and Microbiology (PLPM) at Texas A&M University.   Since coming to Texas A&M in 1981, his research program has focused on the epidemiology, diagnosis, and control of forest and shade trees, with an emphasis on the devastating oak wilt epidemic in central Texas. 

Sheila McBride

Ms. McBride is the diagnostician (Extension Program Specialist) at the Texas Plant Disease Diagnostic Lab.  She has over 20 years of experience working at the Department of Plant Pathology & Microbiology at Texas A&M University, and is well-verse with nematodes, fungi and bacteria.

Refund Policy

The deadline to cancel and receive a registration refund (minus $25 cancellation fee) is March 4th. Substitutions permited.




From Field to Lab - A Hands-On Tree Diagnosis Workshop 

Sorry, this class is filled.
If you would like to be placed on the wait list, contact Gene Gehring at Gene@ISATexas.com


What's killing my tree? Bugs? Disease? Join Dr. David Appel and Sheila McBride for a hands-on tree diagnosis workshop at the Texas A&M Plant Disease Diagnostic Lab. This two-day workshop includes the fine points of field diagnosis, sample collecting and expert instruction in the lab on using diagnostic tools and techniques.

Class size is limited!!!


Monday March 11, 2019 - The Lab and It's Tools

10:00 - 10:15 Introduction to the Lab

10:15 – 12:30 View and discuss attendees’ submissions

In this section, you will talk about samples that you have sent in to Dr. Appel. (You will be sent information on how to do this after you register)

12:30 - 1:00 Lunch (lunch will be provided)

1:00 - 5:00:  Laboratory Diagnostic Stations - including:

  • Tour of the Texas Plant Disease Diagnostic Laboratory (TPDDL)
  • Hand Lens: Demonstration on how to correctly use a hand lens and what to look for when examining symptoms
  • Dissecting Microscope and Digital Camera:  A demo with hands-on training and taking an image with a microscope digital camera
  • Portable Microscope and Laptop: How to use a portable digital field microscope and laptop together
  • Immunotest Strips: Hands-on Phytophthora sp. testing using a commercially available serological kit
  • Oak Wilt: Demonstration how the TPDDL tests and processes for detection of the oak wilt pathogen
  • and more!

Tuesday March 12, 2019 - Fieldwork and Labwork

8:00-11:30 Field diagnostics

Work in the field with experts to learn how to observe, photograph and take diagnostic samples from trees and landscape plants.  Samples will be collected for examination in the lab.

11:30 – 12:00 Lunch (lunch will be provided)

12:00 - 2:45 Lab Work

The attendees will learn the laboratory process of diagnosing tree problems by examining the previously collected tissues under dissecting and compound microscopes. 

2:45 – 3:00 Hand out Workshop Certificates and CEU sign-ups