These look like Austrian or Ponderosa pines since they look pretty tall.  The browning on the tips of the needles is probably still winter injury but I cannot see them closely enough to make any other diagnosis.  There are a few diseases that can cause the death of whole needles and a trig disease that will kill small twigs.  There is also a borer that will kill twigs too but you would see pitch coming out of the places where they are feeding.