Sweet Potato Leaf turn weird

[Wei Hon]

Hi people,

i spotted one of the leaf become weird looking and some other turning yellow. Is this normal?

 

[Cathy]

Got a picture of the back of the leaf?

 

[Wei Hon]

Got a picture of the back of the leaf?

Sorry , i removed the leaf because i worry it might be disease.

 

[ClissAT]

COuld be red spider mite which lives on the back of the leaf.
OR could be the result of too much fertilizer.
The next new leaf seen in the bottom of the photo seems ok so far.