346 CONNECTICUT EXPERIMENT STATION REPORT, 1900. 



bisulphide into the tunnel which they make and plugging it 

 tight with putty. Sometimes they can be killed by running a 

 wire into the burrow, but it is often necessary to dig them out 

 and properly dress the wound with paint. The very best pre- 

 ventive is to keep all trees in a perfectly healthy and vigorous 

 condition. 



We advise that the elm trees on the "Green" and on other 

 centrally located public squares of New Haven be sprayed for 

 a few years to reduce as much as possible the injury sure to be 

 caused by the elm leaf-beetle, canker-worm and other leaf- 

 eating insects. It does not seem practicable to attempt to spray 

 all street trees, but suitable equipment should be procured so 

 that at a day's notice any tree in any street of the city can be 

 sprayed when it is found that any insect pest is threatening 

 serious damage. 



Such equipment should contain at least one power spraying 

 outfit for large trees, and three hand barrel pumps, of which 

 two are of the special form for mixing kerosene and water, 

 together with plenty of J/ inch hose, couplers, extensions, 

 nozzles, etc.,* constructed especially for spraying purposes. 

 The cost of such an outfit would be not far from $500.00. 



Though the members of this committee have not had oppor- 

 tunity to test the various power sprayers on the market, we 

 believe that an outfit such as devised for use in the parks of 

 New York City by Dr. E. B. Southwick, Entomologist of the 

 Park Commission, is the best and most economical equipment 

 for New Haven. This outfit consists of a "Daimler" gasoline 

 motor operating a Gould's force pump. Motor and pump 

 together weigh but 300 Ibs. and may be placed on a spring 

 wagon with the tank containing the insecticide. This motor 

 requires very little attention and is economical, as a gallon of 

 gasolene per day, it is stated, is all that is required for fuel. 



Hand barrel pumps with the kerosene attachment are made 

 by the Deming Co., Salem, Ohio, and The Gould's Mfg. Co. 

 of Seneca Falls, N. Y. The kerosene attachment may be 

 removed and the pumps can then be used to apply any mixture. 



Such pumps (without the kerosene attachment) made by 

 Merrill & Morley of Benton Harbor, Mich, and The Gould's 



*The city of Springfield is equipped with two power sprayers and 

 twelve barrel pumps. See Report of City Forester for 1899, p. 4. 



