EXPEEIMENT STATION EEPORT. 615 



"Sure-Kill" I know nothing about from personal exi^erience, and 

 have no direct knowledge of its composition. It seems to be some- 

 what unlike the others in the character of the oil used, but may be 

 just as effective. But these combinations by no means represent the 

 number of those that were actually made, tried and rejected. "Kill- 

 0-Scale" is sold by the Griffith & Turner Company, of Baltimore, 

 Md., and was, up to the present season, the best, as it was the first 

 combination regularly upon the market. It differs from the others 

 in containing an appreciable amount of free sulphur, and it has 

 approved itself a safe and reliable insecticide. But even this is 

 better now than it was when first put upon the market, and the 

 emulsion is more stable. On this point of stability there is some- 

 thing left to be desired, and all these combinations should be used 

 as soon as possible after their receipt, and none should be exposed 

 to freezing, or even low temperatures, if it can be avoided. Mineral 

 oils in any form or combination work best in warm weather, while 

 the emulsions tend to separate at frost lines. 



The makers of the "Kill-0-Scale" have afforded me every oppor- 

 tunity of making a thorough test of their product, and have been 

 liberal with samples for experimental purposes. 



"Scalecide" is made by the B. G. Pratt Company, of 11 Broad- 

 way, 'New York, and while it is an independent development, it is, 

 in essential composition, not unlike "Kill-0-Scale." From this firm 

 I had a great variety of combinations ; some made from Texas crude, 

 some from Pennsylvania crude, and some* from distillates of all 

 grades to high-test kerosene. "Scalecide" is the outcome of these 

 experiments, which have shown that any grade of mineral oil may be 

 prepared so as to be readily miscible in water. Experiments are yet 

 in progress which ^^-ill, it is hoped, produce a material that may be 

 safely used in summer, when plants are in full foliage. 



The "Target Brand Scale Emulsion" is sold by the American 

 Horticultural Distributing Company, of Martinsburg, W. Va., and 

 is the result of a long series of experiments made by their chemist. 

 Dr. P. Karntz. The method of securing the emulsion is quite differ- 

 ent from that of the other preparations, but the percentage of mineral 

 oil is approximately the same. Dr. Karntz has prepared for me sev- 

 eral samples of oil combinations in quantity sufficient for practical 

 tests, and if not all of these are reported here it is simply to prevent 

 overburdening by a record of failure, which are important only be- 

 cause they resulted in final success. 



