The Tropical Fruit Forum

Citrus => Cold Hardy Citrus => Topic started by: Unicyclemike on September 24, 2022, 02:42:42 PM

Title: My trifolate orange has red vein down the middle
Post by: Unicyclemike on September 24, 2022, 02:42:42 PM
On one limb there are leaves that have this red vein down the middle.  Here is a photo.  What is this?
(https://i.postimg.cc/ygYS5Yts/trifolate.jpg) (https://postimg.cc/ygYS5Yts)
Title: Re: My trifolate orange has red vein down the middle
Post by: kumin on September 24, 2022, 03:09:51 PM
I see this on a few trees as the approach leaf drop in the Fall, especially if the trees are under stress. I've also seen in late Summer with bark/limb/root damage.
Title: Re: My trifolate orange has red vein down the middle
Post by: Millet on September 25, 2022, 01:57:13 PM
Possible nitrogen deficiency.  Symptom start out as yellow/orange veins with some green out on far side.
Title: Re: My trifolate orange has red vein down the middle
Post by: kumin on September 26, 2022, 09:54:10 AM
(https://i.postimg.cc/dZJgVgJL/PXL-20220925-195612567.jpg) (https://postimg.cc/dZJgVgJL)
Red veins showing on a girdled seedling.

(https://i.postimg.cc/jWN1QR5D/PXL-20220925-195619560.jpg) (https://postimg.cc/jWN1QR5D)
Girdled section on red -veined seedling. Note that the growth below the girdle doesn't have red leaves. In addition, the bark below the girdle is a deeper green. The off-green bark may be an related to the red leaves.

(https://i.postimg.cc/kBpY02RV/PXL-20220925-195803904.jpg) (https://postimg.cc/kBpY02RV)
Additional seedling showing red in leaf.
Title: Re: My trifolate orange has red vein down the middle
Post by: Millet on September 26, 2022, 10:26:19 AM
looking at the first picture in the above post, I believe it is just fall coloration.
Title: Re: My trifolate orange has red vein down the middle
Post by: kumin on September 26, 2022, 12:05:30 PM
Millet, the 1st and 2nd photos are the same tree. This coloration didn't show up until recently, so Fall weather likely enhanced the effect.
Title: Re: My trifolate orange has red vein down the middle
Post by: vnomonee on September 28, 2022, 07:06:07 PM
Graft of fast flowering trifoliate on tai-tri also showing red on single leaf, graft acting independantly of root stock?


(https://i.postimg.cc/wtXHkySp/20220928-161311-HDR.jpg) (https://postimg.cc/wtXHkySp)

Can anyone chime in on I am wondering if the grafted scion of a deciduous citrus will go dormant even if the root stock doesn't? The inverse, in a colder climate how does this work say on a loquat (evergreen) grafted to a quince (deciduos)? I also have a Prague Chimera graft on this tai-tri.