(1) Location. A scion-block shall be
located not less than 100 feet from any nonregistered cultivated plant of the
Rosaceae family. The ground in a scion-block and for a distance of 20
feet surrounding it shall be kept either clean cultivated or in an approved,
properly controlled ground cover. Registered scion-block trees shall be
plant and maintained in a manner and at sufficient distance that branches of
different varieties do riot overlap. Care shall be taken in the use of
pollinizing insects and pollen application to prevent the transmission and
spread of virus diseases through the use of infected pollen and/or its
application. Registered scion-block trees shall not be used for
propagation purposes until trueness-to-name has been established.
Each tree shall hear a permanent registration number.
(2) Acceptability. The rootstock and top-stock sources of the scion-block
trees shall have originated from foundation trees established under this
program or from virus-tested trees originating through the Inter-regional
Project No. 2 (IR-2) . If the tree is scion-rooted, its source shall
have met the above requirements. Only registered trees shall be permitted in
the scion-block.