The leaves on my mandrin tree are different sizes. New leaves are very small and somewhat curly but no blotches. The older leaves are dark and shiny.
Insects or disease can cause malformations in leave structures, as well as environmental conditions. Temperature fluctuations and watering practices.
You can treat the tree with Neem Oil, as this works as both an insecticide and fungicide and is safe for people, pets and bees.
Here are some links for you.
I need help with my mandarin tree. I have attached pictures of the different problems I'm seeing and would appreciate if someone could help me and tell me what I need to do to take care of it. It's showing dry/dead branches and sooty deposits on leaves and fruit, and the leaves don't seem to be vibrant. I fertilize it twice a year with a citrus fertilizer (Jobe's Fruit and Citrus 3-5-5), and it's watered with automated irrigation tubes placed near the roots 2-3 inches below the soil 2 times a week for 5 minutes. I don't do anything besides this. Please take a look at the pictures below. Thanks in advance! Norm
The sooty deposit on the leaves is very likely sooty mold, a fungus that grows on honeydew secreted by insects like aphids or scale bugs that attack plants. See this article for tips on controlling it:
Some of the other problems you're seeing, like the curling leaves and non-vibrant leaves, could be caused by the insects that are producing the honeydew. Check the tree carefully for any aphids or scale insects:
I see a brown spot on one of the leaves surrounded by a yellowish area. That, along with the branch that's lost its leaves, can be a sign of Alternaria brown spot, a fungal disease of citrus. See this article for more information:
I found this on my mandarin tree. Can someone identify this please. How should it be treated? Thanks, Norm
This appears to be a case of Wooly Aphids.
This link will help you.
Hi, I've had my mandarin fruit for about 2 years now and we still have not gotten any fruit. Beginning of season it starts to grow some but then they fall to the ground. It is about 3ft tall, feed once a month from June-October (harvest time is November-May)2 C Miracle grow citrus and avocado food, and water it once a week. I also notice some spider webs which I try to remove as soon as I see it. What can I do to help grow some fruit? Thanks Marjorie
It appears to be Citrus Canker on your tree leaves.
These links will help you.
We have had our mandarin orange tree for 5 months and it came with fruit on it, but they have not turned orange. The plant is about 24" high and planted in a 24" chimney flue and planted in citrus soil I got from the nursery. Should i remove these fruits, so it can start next season?
It is likely that the tree isn't quite mature enough to bear mature fruit. Transplanting could have also prolonged the fruiting. They seem to like to be rootbound, and snug in the pot before they will correctly bear fruit.
Here is a link to some articles that will give you some information:https://www.gardeningknowhow.com/edible/fruits/citrus/
We have had drought and then nearly 200ml of rain we were away when we got the rain when we got home yesterday the trees leafs have rolled under,the leafs are really green and healthy looking and doesn't seem to have any pest it also has a lot off fruit on it it is only 2 years old and struggled from the begging it really does look the best it has been thank you for tour time
You are likely seeing the results of the uneven watering of the Citrus Tree.
Tree should be regularly watered. Make sure the soil is well draining to ensure the roots do not sit in wet soil.
This article has more information.
my mandarin orange tree has a graft growing from it that is taller than the tree
The grafted part is the part that you want, as the original rootstock will not fruit like the part that has been grafted on. You will want to cut back anything that grows from below the graft line, as this will be part of the original rootstock, and will take away nutrients to the portion that was grafted on.
Here is an article that is for a lemon, but will apply to all citrus and will help: https://www.gardeningknowhow.com/edible/fruits/lemons/suckers-on-lemon-trees.htm