AGRICULTURAL EXPERIMENT STATION. 197 



7c. Shaking the trees or vines early in the morning and destroy- 

 ing the worms that fall has been recommended for climbing cut- 

 worms. 



I. Kerosene Emulsion has been successfully tried at the Dept. 

 of Agric, Washington, D. C, for destroying root-eating grubs in 

 grass grounds and would, without doubt, prove as effectual in kill- 

 iug cut-worms under similar circumstances. 



For grass grounds we quote from Mr. Cogan's report to Prof. 

 Riley (Insect Life, Vol. 1, No. 2, p. 49), the following: "The 

 places affected were thoroughly drenched with an emulsion of 

 kerosene in the proportion of one to sixteen, and the ground then 

 well watered. I found that where this emulsion was used the 

 grubs immediately ceased their depredations, penetrated further 

 into the ground and not a live one was found to date after careful 

 search, while in other places, where the emulsion was not used, 

 they are still working in a lively manner." For the details of the 

 experiment see periodical quoted above. The above method could 

 be used to destroy the grubs of the May beetle as well as cut- 

 worms. 



We copy the formula for preparing kerosene emulsion from 

 U. S. Dept. of Agric. Rept., 1S84, p. 331, where further details 

 may be found. 



Kerosene, - - - - - 2 gallons, 67 per cent. 

 Common soap or whale-oil soap, - 1-2 '■ | „ u 

 Water, 1 " \ oi 



Heat the solution of soap and add it boiling to the kerosene. 

 Churn the mixture by means of a force pump and spraying nozzle 

 for five or ten minutes. The emulsion, if perfect, forms a cream 

 which thickens on cooling, and should adhere without oiliness to 

 the surface of glass. Dilute the emulsion, before using, with 

 nine parts of water. The quantities used above, when diluted, 

 would make thirty gallons of wash. Prof. Riley urges the impor- 

 tance of proper emulsion, while Prof. Cook uses the followino- 

 formula : Dissolve 1-4 lb, hard soap in two quarts boiling water, 

 add 1 pint of kerosene and mix thoroughly. This should form a 

 thick, cream-like mass. Before using, dilute with two gallons of 

 water. 



m. Killing the worms before the crop to be jeopardized is up, or 

 the 'plants to be set are put out. There are several wavs of 

 accomplishing this end, known under the general names, ball trap 

 system, and poison ball trap system. In all of these methods the 



