ArboristSite.com Sponsors
 
 


Browning Hemlock

Discussion in 'Plant Health' started by Kenzen, May 30, 2015.

  1. Kenzen

    Kenzen ArboristSite Lurker

    Joined:
    Jun 28, 2009
    Messages:
    32
    Likes Received:
    3
    Location:
    Knoxville, TN
    Am getting ready to see a friend's hemlock I treated several years ago (5) for HWA and now he wants me to look at the tree due to it turning brown in the interior but with new growth on the ends. Could be anything from natural needle loss to Phytophthora since they have had issues with drainage on some other plants. So anything else I need to look at? I will take some pics if I am unable to diagnosis the issue. I usually do not have to treat any hemlocks beside for HWA.
     
  2. Raintree

    Raintree Penguins are tasty

    Joined:
    Jun 3, 2012
    Messages:
    3,215
    Likes Received:
    6,164
    Location:
    Mass
    Not much info to go on here. Look for...
    Properly planted
    Shady site or full sun
    Poor drainage = low oxygen
    Soil fertility
    Scale
    Size of new growth
    Color of last years needles

    I would guess normal needle loss.
     
  3. ATH

    ATH Addicted to ArboristSite

    Joined:
    Nov 18, 2006
    Messages:
    3,844
    Likes Received:
    2,608
    Location:
    Ohio
    You treated it once 5 years ago? Has it been treated since?
     
  4. Kenzen

    Kenzen ArboristSite Lurker

    Joined:
    Jun 28, 2009
    Messages:
    32
    Likes Received:
    3
    Location:
    Knoxville, TN
    Yes five years ago. Have not seen the tree in a while, but I believe needle loss. Still they have planted trees to close to concrete driveways, overcrowd plants, have some drainage issues, and all of that will be looked at. I did show them what to look for for HWA. And have had luck with imidacloprid lasting up to 7 years in healthy trees so will look at treating them again. I will get back with you later
     
  5. Raintree

    Raintree Penguins are tasty

    Joined:
    Jun 3, 2012
    Messages:
    3,215
    Likes Received:
    6,164
    Location:
    Mass
    Unlikely interior browning is due to a biotic issue.
     
  6. Kenzen

    Kenzen ArboristSite Lurker

    Joined:
    Jun 28, 2009
    Messages:
    32
    Likes Received:
    3
    Location:
    Knoxville, TN
    He did contact me after asking him to get a better idea and said that their are healthy needles on the interior then brown needles then healthy new needles. So I'll have to look at it no matter what his description is, take some samples and take home to look at under hand lens.
     
    treeseer likes this.

Share This Page