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Insects and Fungal Diseases #871337

Asked June 03, 2024, 2:48 PM EDT

What are these squishy black round things on my arborvitae? my “picture this “app states it’s spotless ladybugs , do you agree? is treatment necessary, if so, what would you recommend? My arborvitae has recently been diagnosed with a fungal disease. I have cut out all the diseased parts and plan on spraying with Propiconazole or Azoxystrobin the end of this week. Do you prefer one over the other?

Hennepin County Minnesota

Expert Response

Thank you for writing.
I think this is more likely to be early scale. https://arbor-experts.com/scale-insects-in-southwest-ohio-description-damage-treatment/
I would use Neemoil without any other pesticide mixed in.   
https://extension.psu.edu/fletcher-scale
Follow directions!
Steve Miles, Master Gardener, Hennepin County MN (I am a human being, not a bot nor AI). I am an avid gardener but am not a degreed or certified horticulturist or arborist. I am happy to receive follow-up questions if my responses are incomplete or unclear.  This is the University of MN' garden soil testing service.  https://soiltest.cfans.umn.edu/testing-services/lawn-garden This is guidance on how to find a tree expert.  https://extension.umn.edu/planting-and-growing-guides/how-hire-tree-care-professional The Minnesota Landscape Arboretum is a wonderful place to see and learn about plants that grow in Minnesota. https://mngardens.horticulture.umn.edu/minnesota-landscape-arboretum Replied June 03, 2024, 3:02 PM EDT

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