The tree has a fungal disease.
Cold weather can cause citrus leaves to curl and so can water stress. Aphids are another cause.
52% of leaves turn yellow yes this may be true but you need to state your reference!!
The part of the leaves that cover with the black paper will change color to yellow or weakness and for many week this leaves will die.
I would check for mites. This sounds like something that is sucking the juices out of the leaves.
no. the liquid that comes out of a volcano can turn into pumice.
we curl the leaves and thats the curl
No, too much water does not make the leaves of a citrus tree curl. Hot sunshine is what makes the leaves curl and twist.
leaves that curl up
aphids
they die or they do not have enough water, therefore not producing sugars; causing them to curl which is a sign that they are dying.
The plant is either over fed, over watered, or given too much direct sunlight...or all of the above
When humidity is going up and storms are coming, trees turn their leaves over to help absorb moisture. Seeing the leaves curl in this way is a good predictor of rain.
Bugs are wiping their asses on them
malathion
When the leaves fall down the supply of chlorophyll is stopped
When the leaves fall down the supply of chlorophyll is stopped
Heaven.