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Techy Arborvitae!! HELP Fungus or mold. #875398

Asked June 30, 2024, 7:31 PM EDT

Please help me.. This is my first time that I installed six conifers. I love them. Just got them installed.. I went to check on them. They have this horrible white stuff on them. I was told that it's incredibly hard to kill techy Arborvitae. Much to my horror this white stuff is growing on them. One is really bad. Please help me. They are less than one month old.

Hennepin County Minnesota

Expert Response

To know for sure, send a sample to Plant Disease Clinic. There is a fee for this service. 
https://pdc.umn.edu/
Other possibilities:  Fungus?
https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/insects-pests-and-problems/diseases/needlecasts/pestalotiopsis-tip#:~:text=Pestalotiopsis%20is%20a%20type%20of,unfavorable%2
Bird manure?
https://ask2.extension.org/kb/faq.php?id=316036
For other diseases
https://apps.extension.umn.edu/garden/diagnose/plant/evergreen/arborvitae/index.html
Linda G Tenneson, Benton County Extension Master Gardener & Tree Care Advisor Replied June 30, 2024, 8:20 PM EDT

You have really given me no answer. I am happy to bring this in and pay. Hardly bird manure when it's on the under part of the leaf. 

The Question Asker Replied June 30, 2024, 10:06 PM EDT
Note, these questions are answered by UMN Extension Master Gardener volunteers. We do the best we can based on descriptions and pictures. I did not find any exact answer when I researched your question. Sending a sample to the Plant Disease Clinic is the best way to find out. There is no other UMN service where you can pay for a person with a horticultural degree to look at your plant. 
Linda G Tenneson, Benton County Extension Master Gardener & Tree Care Advisor Replied June 30, 2024, 11:44 PM EDT

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