The Q&A Archives: Degroots Insect or Fungus problem

Question: Degroots Arborvitae: Eight were planted two years ago this November at about 6 feet tall. Now are seven or more and growing beautifully. This summer has been extremely hot 95-100 degrees for weeks at a time with almost no rain until this week although during the spring it rained lots. I have been watering with a soaker hose. They all have developed large areas of a brownish color with gray topsides and some with red tipped ends. They look like they could be slowing dying but none of the areas have actually died. This started weeks ago and is progressing. There are spider type webs which I clear out but which reappear. When I shake the branches, only one of two mites fall out. I'm at a loss as to what to do.

I have Sky Pencil Hollies which are clearly dying which were planted at the same time and have been growing madly and looking beautiful until now. I have seen a few webs on them. They are not dying out in a circular fashion but vertically. The Degroots seem also to have more of a vertical problem than a circular one. Please help!

Answer: Unfortunately, based on your description I am unable to diagnose the problem for you with any certainty. I would strongly suggest you work with your local county extension and/or professionally trained and certified nurseryman to determine exactly what is happening to your shrubs. Once you know that you can decide together how to treat them. I'm sorry you are having trouble.

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