There are several reasons that leaves may curl on an apple tree. One may be due to high temperatures. Supplying plenty of water to the tree would be beneficial. Leaves curl to protect themselves. Aphids could be another reason. The leaf will curl due to aphid feeding. Aphids also produce large amounts of honeydew which covers leaves, branches, and other nearby objects. Honeydew is a waste product that aphids produce while they are feeding which is also attractive to ants. You might check for these signs. Are the leaves brown or are they still green and curling? Check the leaves for any spotting, which could be caused by a fungal leaf spot. If you could reply to this message and supply us with digital photos of the leaves and the tree, it would help us to determine better what the cause is.

Enclosed are pics of the honey crisp and it's problems. Hope you can help, we've spent three years
getting it going.

Thanks

More pics

It is common for honeycrisp to delay bearing for up to seven years. It may be affected by a physiological condition specific to Honeycrisp called leaf zonal chlorosis or Honeycrisp leaf complex. Mottling and curling are typical symptoms. The complex isn't caused by disease, insects or nutrient deficiency and usually doesn't affect the tree's growth or productivity or it may just be the weather, give it a little more time.

Compare your tree's leaves to photos and information at the following websites:

http://smfarm.cfans.umn.edu/HoneycrispLeafzonalchlorosis.htm
http://msue.anr.msu.edu/news/honeycrisp_leaf_yellowing_showing_up_on_michigan_apples
http://www.omafra.gov.on.ca/english/crops/facts/05-047.htm#leaf