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Q&A – What caused these patches on my lawn? Is it army worms or herbicide or fertilizer?

Question:
What caused these yellow patches on my lawn?  Some are large, 4 feet by 2 feet.  A lawn company added fertilizer and herbicide about a week before they appeared.  Is this fertilizer burn or damage from adding too much herbicide?  It looks similar to damage from army worms that I had about 3 years ago.  Are the army worms back? 

Answer:
It is hard to say. It is probably too early for army worms, and if it were, they would be easy to see. It may be a fungal disease, but without closer investigation you can’t tell which one. It could also be herbicide damage or fertilizer burn. There needs to be more investigation to determine what is causing the problem.

Additional Resources:
Fertilizer Injury - Lawns
Armyworm
Armyworms in Turfgrass
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  • Home
  • Watch
    • TV Schedule
    • Full Episodes Online
    • How-to and Informational
    • Questions and Answers
    • This Week in the Garden
    • Garden Notes
  • Garden Topic Collections
    • Apple Trees: How-to and Information
    • Peach Trees: How-to and Information
    • Tomatoes: How-to and Information
    • Square Foot Garden Blog
  • Resources
    • Soil Testing
    • Extension Publications
    • Gardening Resources
    • Blogs
    • Organic Gardening
    • Articles
    • Privacy
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    • Ask a Gardening Gardening Question
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