The Collaborative International Dictionary of English v.0.48:

Jenneting \Jen"net*ing\, n. [Prob. fr. a dim. of Jean John, so
   named as becoming ripe about St. John's day, June 24. F. Jean
   is fr. L. Johannes. See Zany.]
   A variety of early apple. See Juneating. [Written also
   geniting.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Juneating \June"a*ting\, n.
   A kind of early apple. [Written also jenneting.]
   [1913 Webster]