CHE REFERENCE LIBRARY - Pole Shift Survival Information

fall prematurely, thus retarding the development and growth
of the plants. Not only dots this condition rdx it necessary
for a longer time to t*lapse before the stock is salable, but
premature dcfoliat ion also prevents proper maturation of
the trees and n~akcs them less able to withstand winter injury,
a(lvcrs;e conditions cnc~ountered in stx)rage, and the like.
Mtdhcts cwninitrd~~ pra&& for the prevention of diseases
of cjl(ltJr and maturer plants are in many cases not appli-
DDE? to tlitl smtdlcr st.cx*k in the nursery, while in many
c’ascs certain mt~tllods of control can be employed in the
nurstxr>. whic4r UNII~ not be us4 in the treatment of mature
ph Ilt 5;.
( )W of the importimt prohlems confronting the nurseryman
is it satisfac~tor~ mCans of applying t,lie various fungicides and
i nst’&ides. An a,pparatus is desirable l3a.t will apply the
materi:! with that least, inc’onvtGenc’e, permitting the work
to bc ptlrft-rrrned wit 11 considerable rapidit,y on a wide acreage
and as ccollc,lnic~i111?- as possible. The materials may be applied
in ;I powdrred form with air used as a carrier, or as a
spray- with water as a c*arrier.
For spra>-ing tmrsq- stock, there are numerous handspra>*ers
that c’an brb used for small plantings, but there is no
power ma-lcGne on the market t.1la.t is entirely satisfa,ctory for
large :lurstlrl\- work. It is difficult to build a machine that can
be transported o\*er tall nursery t.rees. On the other hand,
the narrow $pac’e separating the nurser>’ rows makes it difficult
to construcht 11 sprayer tShat will run between the rows.
With the spra)yerx that have been used, only a relatively small
amount of stock can be covered within a given time ; this not
only increases t,he expense? but in many cases it is impossible
to cover all of the suscheptihle st,ock before it is too late for
the application to be effective.
Most of these difTiculties a,re overcome when the materials
are applied in t,he powdered form. by means of a dusting ma-