Inredigatioits on Fnnsi Insects, nml I'urtst I'luUclinn. 37 



sp»'( ics iii;iy lie viiliicriihlc iif (litVfiiut >;oiiij; iT|i(»i-tH <»f Kiicfi*MNfiil roiilrol 



I>t'ii()<ls of their lifc-liist(tn ami at work undfr fon-Mt romlitioiiN not ilin- 



(litVcri'iit tiiiits of tlif year. similar from (»iir own jin* a wuim- of 



'I'li.Mv lias Imm-11 ralli.'i- a tcii.l.n. y, Jf'"''^'' ••ii<oiiraj;«Miirnt in tin- ••■•i '■<• 



uiifortiiiial.ly. on tli.- part of pra'e- f'H'*' us of «(.ntrollini; tliitw- s. 



tical luiiilicrm.'ii and foH'sters to «'«*n«'tive nitrrnci«*M. Tin* nioMi nu|»or- 



d(Hil)t the practicahility of lueasiireg <''"' i<'M"isile i,oss Ik the ip- 



of (oiitrol for hark beetles, not to I""'* '""' ••<»-<»p'''i''' ' '■•• 



iii.-iitioii other forest insects. I'rae- f<'"i"eeted with tl .it 



tieal deiiioiist rat ions, howt-ver, are ^^'''''' <'o-«»p«'ratioii Aork t-nnnot 



now convineitii; them that the trees sueeeeil. 



ean l)e treated t'or hark heeth's and 'I'he following > ininir 



that lar»;e areas ran hi- pi'oteeted. K\- drawn up and is heinj; sent !•> 



c't'ik'Mt (U'lMOMstration work of this lis possihie of the pei-Hons who are 



kind is hein^ eari-ied on in the I'nited en>,'ay:ed in forestry w !a. 



States hy Dr. llo|)kins in co-operation Mr. K. 11. Caiiiplieli, hn. 



with the I'nited States Forest Ser- Forestry I'.ranch of the I )i 



\ i( e. private ownei-s and other bodies, of the Interior, who !i(f 



In on«' locality in .Montana 1<».<»(I() with the Division of V. in 



trees wei-e treated in !!»<)!) with the n-- this wm-k, is i.ssnint; this ■ ... .,.., to 



suit that in llMO instead of the foi-mer all the <d"ticers of the iSranrh. 



death-rate of nioi-e than 1(>.()()() trees , .,., n-.-.: # l- . i . 



annually, only 2.0(>() trees reipnred .|iu-tH yoiip as'iMan.-o an.J • m 



tl'eatmellt within an area of over one <il)tiiininK inf«iriii:iti. • ' 



hundred s.iuare miles. This control i" »** i"i>"-i..ns t.. 



woi-k cost nothni''. as the ntdi/.atinn 



of the treated trees for fuel and lui , ,^1, to U' iiytilii-.l of any oi • .»r 



Iter more than I'epaid the cost of treai - nirfj't in-<'<t '• n to. or ' 



ment. Heviewin^' the control work in >""• '" •'"«' '"">' '' 



the Kocky Mountani retrion. I'r. 



Ibtward st.ntes that since 1!K)'J (»\i' Thorr havf Iuhmi u.I 



ir».'),4(>() trees have been treated at ; >r«' at |.n"<- • 't 



ultimate cost of .$;n.'_'l 1 ; 1 14.«ii»T 1 n ■ ^ ^'•"•<'* "^ '' •»• 



liavni<r lieen utilised so as to muif , 



•^ . an* to I.. 



than cover the cost (d treatment, aiiv tiino. \" 



while 44. .")!!> trees wei'c treated at a cxM'iitial to . 



direct expense of $:{(».!>•_'.'). It is cs- ••ontrol. ax r 



timated that the limber savcti Jis the prrM-nt 



direct result of this control Woil • hmhI.-iMi- o|hiii • 



presents a stumpa^re value of ovei - •' ' \.. .,<... 



00(1. IMK). • it is si;;nilicant,' Dr. II 



ai'd says, 'of the practical natui 



the methods of control recommeiel* >1 ||„y , 



by the r.ui'cau ami of the prae''' ■' or i.. 



demonsti'ations that have U'cn "' 



ried on that no complaints of dcpr' 



dations havi- come to the Miircan 



in*: the yejir from the areas in < ■ 



rado and .Montami, where eoii»r.»I 



work was «'arried on in previous \ 



aceordinj; to the instructions >;- 



Bureau.' To tho.se who are ;■ ''• 



ed with the extent of the d«'pi 



of b;irk beetles in Canada I' 



T 



