34 



Mr. Smith said this would not occur iu tlie case of young larvie. 



Mr. Forbusli said larvjc would bridg(3 over anj^ band when very 

 numerous, and that such a result could only be prevented by visiting 

 the bands at frequent intervals and collecting the larvae accumulated 

 beueath. 



Mr. Smith said that the American product leferred to in his pai)er 

 was less affected by extremes of temperature than the European lime. 

 He was convinced that in insect lime we have a valuable means of 

 defense against many insects, but that there is room for considerable 

 improvement at j)resent. 



Mr. Forbush said that while he had discontinued its use in the work 

 against the gypsy moth, he believed that there were great possibilities 

 in the proper use of insect lime. 



Mr. Fernald, referring to the Itussian lime, said that all the material 

 probably came originally from Germany. 



Mr. Smith stated that the constituent elements of the lime very 

 possibly came from the oil regions of Eussia. 



Mr. Marlatt said the Department of Agriculture had received samples 

 of this raupenleim and called attention to the A'ery strong similarity 

 between this substance and ordinary axle grease, both in odor and 

 2>hysical qualities, and suggested that the composition of the lime was 

 probably very similar to that of axle grease. He said that in apiilica- 

 tions to trees, as against scale insects and wherever applications were 

 more generally made than by mere banding, the after effect on the tree 

 would in^obably be disastrous, although it might not develoi^ for some 

 months. Experiments with other oils on trees gave a strong proba- 

 bility in this direction. 



Mr. Smith said the insect limes would very probably turn out to be 

 material similar to axle grease. The dendrolene referred to by him 

 was a Standard Oil Company's i)roduct, and would very likely appear 

 under difi'erent iu\mes as coming from different houses, although all 

 would obtain their supply from the Standard Oil Company. As api)lied 

 to old bark, which had no vital function, subsequent iujury need not be 

 feared. 



Mr. Howard referred to the press rei:)orts of the loss by a Kentucky 

 orchardist of a thousand valuable peach trees from the application of 

 linseed oil, with other ingredients, as a preventive to the borer. The 

 recommendation which led to the ai)plication was charged to the 

 Department of Agriculture, this charge proving, however, by the man's 

 own admission, to be unfounded. 



Mr. Davis remarked that a similar remedy had been recommended by 

 the United States pomologist to the fruit growers of Michigan. 



Mr. Smith called attention to the necessity, in rei^orting results, of 

 giving adequate exi^lanations, instancing the danger of confusion in 

 the use of the term ''emulsion'' arising from the different kerosene emul- 

 sion formulas used as a case in x>oint. 



