Bonsai Study Group Forum

General Category => Evergreen Bonsai Discussion => Topic started by: snipologist on September 09, 2013, 07:07 PM

Title: Tip dieback on juniper
Post by: snipologist on September 09, 2013, 07:07 PM
During the summer and continuing into fall I have noticed a sporadic dieback of the tips of some of my junipers.  I have 2 Juniperus chinensis Foemina which are showing the most of this.  It is only the last quarter to half inch that turns yellow and then brown.  It is scattered randomly on the tree, not in any particular area.  I am hoping to put one of the Foeminas in our club show at Morton Arboretum on the 21 and 22 of September and I have had to clip out several yellow and brown tips.  Any ideas what this is or suggestions?
Title: Re: Tip dieback on juniper
Post by: bwaynef on September 09, 2013, 07:18 PM
Pictures would help.

Are there any pests?  Have you checked for mites?
Title: Re: Tip dieback on juniper
Post by: snipologist on September 09, 2013, 07:25 PM
No mites or insect pests.  I checked that first.
Title: Re: Tip dieback on juniper
Post by: Minogame on September 09, 2013, 08:52 PM
Google Juniper tip moth, there is a picture of the dieback. You may not see the moths now, but if you look closely, you may discover small cocoons (?). What do the other junipers in your neighborhood look like? I found some infested when i had a problem with my trees. If not insects then consider fungicide.
Title: Re: Tip dieback on juniper
Post by: snipologist on September 10, 2013, 03:06 PM
I am thinking its a fungus.  I can't find any insects or evidence of insects.  Junipers in neighbor's landscapes look okay but  I haven't gotten that close  to really check.  Since it seems to affect only the very tip it would be hard to see without waking up to the plants.   think I will try a general fungicide like Daconil  and see what it does.
Title: Re: Tip dieback on juniper
Post by: Minogame on September 10, 2013, 11:20 PM
Living here in the NW, both fungus and insects need to be preventively controlled. Especially if the trees are valuable. But i would caution as to spraying with fungicide or insecticide without knowing the reason or cause of the problem. Take the plant to a local nursery, or club member, or look on line such as at http://urbanext.illinois.edu/focus/evergreen.cfm (http://urbanext.illinois.edu/focus/evergreen.cfm)
Title: Re: Tip dieback on juniper
Post by: snipologist on September 11, 2013, 01:32 AM
I think I have found an answer.  I had a certified arborist over for dinner (good to have a friend in the industry) and he said it looks like a tip blight, either Phomopsis or Kabatina, but more likely Phomopsis.  We had a very wet spring which promoted it and the daily watering, sometimes late in the day, on my trees keeps it going.  His suggestion was pick off the infected tips,  keep the foliage dry, and spray with fungicide.  It was also on one of my shimpaku which was in a place with less air circulation.  Thank you all and I will keep this open for any other comments, ideas, or suggestions.  
Title: Re: Tip dieback on juniper
Post by: bwaynef on September 11, 2013, 10:28 AM
Pics would <still> be helpful.