Bonsai Study Group Forum

Species Specific => Japanese Black Pine Bonsai Discussion => Topic started by: Kent2106 on May 07, 2016, 11:47 AM

Title: pest or fungy
Post by: Kent2106 on May 07, 2016, 11:47 AM
Hi All,

the needles of two of my trees turning into this - see picture. We are going into autumns and the needles have been looking fine 2 month back.  There are also tiny resin drops on the needle tips. Do you think it is a sign of root rot or a needle fungy? I have been spraying with Daconil (Chlorothalonil) with not much of success. These two trees have been doing fairly well during summer with no indication of this...

You advice would is highly appreciated

Title: Re: pest or fungy
Post by: Kent2106 on May 09, 2016, 03:55 AM
..ok, here a better pictures...  This what you see has started 2 weeks ago...
Title: Re: pest or fungy
Post by: bwaynef on May 10, 2016, 09:12 AM
Most fungus that affect JBP (that I'm familiar with) appear as bands toward the middle of the leaf.  This looks to me like it could be water-stress on the roots leading to the edges yellowing/browning.  It looks like its in a pretty inorganic mix.  When was it repotted?

I also see it recommended that fungicides be on a rotation.  Daconil is often recommended, but you might want to consider another fungicide (or 2?) to create a rotation.
Title: Re: pest or fungy
Post by: Kent2106 on May 12, 2016, 09:17 AM
Thank you for your reply!!!
Tree had been repotted a season ago but it was a very stressed tree. I do  lime sulphur wash in winter and want to start with Copper Soap in spring - to alternate.

the mix has 20 peat, the rest is inorganic.

Why are these little droplets (i believe it is resin...)on the on the needle tip? I have checked for mites but couldn't find any nor anything else.    I am spraying regularly with insecticide so I would be surprised if this is the result of some piercing insects...   

...but I might be wrong