ed
when the nuts were planted immediately in a warm greenhouse without
pretreatment, but that germination was markedly increased when the nuts
were held in a cool moist environment from one to four months before
bringing into the greenhouse. She also found that fall planting of
hickory nuts resulted in a good stand of seedlings the following spring
if the soil was mulched, but that the freezing and thawing of
unprotected ground resulted in an exceedingly poor stand of seedlings.

Burkett(6) advocated stratifying pecan seed over winter in moist sand
and planting in moist soil in the very early spring. He observed that
thin-shelled nuts germinate more quickly than thick-shelled ones, and
warned against "damping-off" fungi which often killed young seedlings.

Brison(5) stated that some nurserymen prefer seed of certain pecan
varieties as Riverside and Burkett for rootstock purposes as these
produce strong vigorous seedlings. He reported that while the pecan seed
does not have a rest period, germination is increased by stratifying in
moist sand for 2 to 3 weeks or soaking in water, changed daily, for 4 to
5 days previous to planting.

Propagation by Layering

No records are available in regard to any hickory species or variety
other than pecan having been propagated by any method of either soil or
air layering. The writer(14) while experimenting with aerial layering in
1945 found one instance of root production on a hickory where the branch
was girdled at the base of the one-year wood. This method offers
possibilities, especially now that polythene plastic is available for
retaining moisture in the moss about the girdle or wound on the layered
branch.

Gossard(9) reported success in producing roots from the tops of small
grafted and budded pecan trees by trench layering and from older trees
by aerial layering with marcot boxes. He indicated that a favorable
combination of etiolation, moisture, rooting medium, and a root-inducing
chemical was desirable for successful rooting.

Propagation by Cuttings

Hardwood cuttings of pecan were rooted by Stoutemyer and O'Rourke(23) in
1938 by first callusing the bases of the cuttings in warm moist peat
moss, and then treating with an aqueous solution of indole butyric acid
before planting. Both roots and shoots grew well for three to four weeks
and then the shoots wilted and died. It was observed that the roots were
thickened and presented an abnormal appearance. Trials during