CHE REFERENCE LIBRARY - Pole Shift Survival Information

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194 THE NURSERY-MANK4i
punctures the tissue and thus furnishes a means of entrance
for blight germs.
Fire-blight is frequently introduced into seedling blocks
by the use of diseased cions cut from blighted trees. The
seedlings buddetf with the diseased buds, not only blight, but
the ba.cteria art: carried on the budder’s knives to other seedlings.
Later, at rebudding time, the budders being unfamiliar
with the disease, frequently attempt to rebud the blighted
stocks ; their knives become infected and the bacteria are
transmitted to other seedlings.
The shipment of eions from one nursery to another may
also be a means of transmitting the blight, and blight bacteria
have even been known to live over in cions used for grafting
purposes. In the winter, when the grafts were cut, the grafting
knives became infected ad transmitted the blight bacteria
to grafts made from healthy cions.
Chtd. - The elimination of l)lig~lt-tfissemiriatixig agents
is a11 importa,nt crmsideration in the control of fire-blight. It
has been dernonstr~~tcd that controlling the aphids is frequently
an essential step in preventing the spread of blight bacteria,
All sources of infection should be destroyed, such as neighboring
blighted orchard trees, and an att.empt made to eradicate all
traces of the disease as soon as it appears in the nursery. It has
proved profitable to remove the blossom-buds on two- and threeyear-old
quince trees. By removal of the buds before they
open, the danger of blossom infection is eliminated. Frequent
s;\~stematic inspections should be made td all blighted shoots
removed and the wounds disinfected with a solution of corro-
sive sublimate 1 to 1000. If the blight has extended into the
trunk, the entire tree should be removed and burned.
~ItOWN4;ALL. -- Crown-gall or root-gall is commonly found in
many kinds of trees and other plants in the nursery. Fruittrees,
berry bushes and roses are frequently attacked. The