apple tree question please.

Hi, I planted a couple of apple trees last year and they have done very well, until now. Both looked healthy and now full of blossom, but one of them seems to have developed a problem over the last few days. The leaves on one tree seem to be curling slightly, with some blackening, and crisp to the touch.
Any ideas please ?
Gazania

 

Sounds like possible frost damage.

 

Hey Pete, didn't believe my wife this morning when she drew back the bedroom curtains and told me my car was covered in frost ! You might be right !
Gazania