The picture attached is why it looks like and it important I keep it.
Take your lychee and repot it. Water it heavily once and bag it up with a clear plastic bag, try to create some humidity for it. The longan looks like it will drop all it's leaves but should survive. In terms of stressed out plants, yellow leaves that drop are usually a.
Feb 08, When temperatures drop below 32 degrees F. (0 C.), lychee tree foliage may turn yellow or brown and wilt or drop. Fruit set can also be delayed or damaged by excessively cold periods. Before assuming that your lychee tree has a disease, consider what weather extremes it has been exposed to.
If it has been unusually cold, it could just be winter damage. However, if it has been unseasonably warm, humid, and wet, you should thoroughly look for symptoms of disease in lychee treefelling.barted Reading Time: 4 mins. Jan 28, It can be common for lychee trees to display yellow or brown leaves as they adjust to environmental changes.
Commercially they are fertilized specifically to induce abundant fruit set, but lychee trees in the home garden will do best with a general purpose fertilizer for fruit trees. Using slow release fertilizer helps avoid fertilizer treefelling.barted Reading Time: 3 mins.
Temperature below (0 C) causes the Lychee foliage to go yellow, brown, or even drop. It not only affects the leaves, but the fruit growth is damaged and delayed too. Therefore, before concluding that your Lychee tree is diseased, make sure to take a note of the weather conditions it has been exposed treefelling.barted Reading Time: 8 mins.
Jul 20, Leaves dropped for this reason will be yellow to tan with few if any leaf spots on them. Ten to twenty percent or more leaf drop is possible, but unless a tree is heavily defoliated for several years in a row, this normal adjustment to heat and dry weather doesn’t affect the health of the treefelling.barted Reading Time: 3 mins.