Plant Health Diagnosis: Assessing Plant Diseases, Pests and Problems

Learn a process for diagnosing plant health problems, including signs and symptoms of diseases, pests and insects, and environment or management issues.
Plant Health Diagnosis: Assessing Plant Diseases, Pests and Problems - Online Courses
Skill Level: Beginner
Length of Access: 365 days
Sections: 4
Length: 2 hours
Language: English
Note: This course offers 4 PDA Pesticide Applicator Recertification Credits.

Starting at FREE

* Required Fields

Starting at FREE


Plants can be affected by many problems, ranging from insects, animals, and disease, to the environment and poor plant care. Some of these often produce similar symptoms. This course will help you understand and diagnose the range of plant problems.

Quick and accurate diagnosis provides the greatest chance to solve an issue before the plant is lost. You'll learn how to evaluate a problem using the steps of plant health diagnosis to assess site conditions, evaluate plant management history, evaluate symptoms, and use references and resources to diagnose problems.

This self-paced course focuses on ornamental trees, shrubs and plants for landscaping, but the plant health and disease diagnosis principles can be applied widely to all plants or crops. Through a series of videos and readings, handouts, symptom images and case studies, you will learn the steps in diagnosing many plant health issues. There are interactive practice questions dispersed throughout the course, as well as a final quiz. Once you successfully pass the final quiz, you will earn a certificate of completion.

By successfully completing this course, you can earn 4 Pennsylvania Department of Agriculture (PDA) pesticide applicator recertification credits in one of the following areas:

PC - Private Category
06 - Ornamental and Shade Trees
07 - Lawn and Turf
18 - Demonstration and Research
23 - Park / School Pest Control

(Note: it may take 2 to 4 week for recertification credits to be reported to and verified by PDA.)

Who is this for?
  • Landscapers
  • Horticulture professionals
  • Homeowners who are avid gardeners
  • Those wishing to improve their plant diagnosis and management skills
What will you learn?

You will learn how to:

  • evaluate a problem with multiple causes using the steps of plant health diagnosis
  • assess plant site conditions
  • evaluate plant management history
  • recognize plant signs and symptoms
  • use references and resources to assist in diagnosing problems


Integrated Pest Management Entomology Horticulture

More by Tim Abbey 


Only registered users can write reviews. Please, log in or register

Frequently Asked Questions


What happens after I register for an online course?
What if I do not receive an activation e-mail after completing course registration?
How do I register for a course or make a purchase over the phone?
How long does it take to complete an online course?
Do I have to complete an online course within a certain timeframe? Will I ever lose access to an online course?
Are online courses graded?
Do online courses have assignments or quizzes?
Do I receive any credits or certification for completing an online course?
How will I access my certificate once I complete an online course?
What materials will I need to complete an online course?
Is there technical support for online courses?
Can I enroll in multiple online courses at one time?
What are the technical requirements for online courses?
I am not a Penn State student. Can I enroll in an online course?
Will online courses go on a college transcript?
Who can take online courses? Are there any prerequisites?
Can I register a group for an online course?
Who are the online course instructors?
Are online courses accessible for people who require special needs or services?
What do I do if I have a question about a specific online course?