200 OHIO EXPERIMENT STATION: BULLETIN 194 



. ^ Paris Green is mixed with water at the rate of one 



i'aris Grreen ^^^^^ ^^ ^^^ ^^ ^^^ ^^j ^j ^^tg^_ T^-o or three 



pounds of lime are added to prevent burning. The mixture settles 

 readily to the bottom of the sprayer, rendering: frequent agitation 

 necessary. 



REMARKS. 



As Stated at the outset, the problem of the control of shade tree 

 pest-sis one to be encountered to the greatest extent in cities and 

 towns, and is largely a municipal matter. Already steps are being 

 taken in some cities, Cleveland being the most advanced in the matter 

 in this state. 



The city of Cleveland has authorized the Department of Forestry 

 to extend its operations to the combatting of the shade tree pests, and 

 to this end has commenced the purchasing of suitable apparatus for 

 the purpose. 



The personnel of the department consists of a Forester, Assist- 

 ant Forester, clerks, and a number of "tree wardens." To the 

 latter are assigned certain sections of the city. Besides their duties 

 of planting, trimming, etc., as far as possible each is supplied with 

 a spray pump mounted on wheels which he uses to the best of his 

 ability. The two large power sprayers, before mentioned, travel 

 about over the city to the points where the work is most needed. 



At present the work of the department is confined to the street 

 and park plantings. _ It is very necessary, however, that the Depart- 

 ment be allowed to expand, until it is able to care for trees on private 

 grounds as well, as it loses much of the good effects that should 

 follow the work, because treated trees are reinfested by adjoining 

 untreated ones. Possibly a fair sum could be charged the property 

 owners for the service rendered. 



It is evident that all cities and tovyns cannot afford such an in- 

 stitution as the Cleveland-department, but it is the author's opinion 

 that the public sprayer most nearly approaches the solution of the 

 shade tree insect problem for the cities and towns of our state. 

 ACKNOWLEDGEMENTS. 



The author wishes to express his appreciation to Prof. H. A. 

 Gossard, Entomologist of the Station for his suggestions and approval 

 of plans for work; to Mr. M. H. Horvath, former City Forester of 

 Cleveland, and to Mr. John Boddy, the present Forester, for their co- 

 operation with the Experiment Station in the conducting of experi- 

 mental work, arfd to Mr. C. R. Neillie, of the same department, for 

 being accorded the.opportunity from time to time to examine the 

 records of the work done by the po'wer sprayers; and to Mr. W. H. 

 Goodwin for preparation of one or two of the illustrations, among 

 them the cover cut. 



