The Tropical Fruit Forum
Citrus => Cold Hardy Citrus => Topic started by: Unicyclemike on September 24, 2022, 02:42:42 PM
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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)
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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.
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Possible nitrogen deficiency. Symptom start out as yellow/orange veins with some green out on far side.
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(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.
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looking at the first picture in the above post, I believe it is just fall coloration.
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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.
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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.