No. 4.] INSECTICIDES. 369 



sion made with hard soap. Their killing properties are 

 equally as good and they do not damage the foliage. Kero- 

 sene emulsion is an invaluable remedy against nearly all 

 plant and bark lice, and for this purpose it should be applied 

 as a spray. 



Eaupenleim, Etc. 

 Another class of insecticides, or perhaps more properly 

 "insect-traps," includes the various mixtures for banding 

 trees to prevent the ascent of injurious insects. Chief 

 among these are coal tar, printers' ink and the German Eau- 

 penleim (" insect lime "), or, correctly, caterpillar-glue. 

 When gas tar, printers' ink or a mixture of the two are used 

 a tight-fitting band of tarred sheathing paper should be 

 first tacked around the tree and the substance spread on the 

 band, thus avoiding injury to the bark. With Eaupenleim 

 as ordinarily used there is not much danger of injury. Be- 

 fore applying it the trunks of the trees should be scraped 

 smooth at the point on which the band is to be placed. The 

 substance is a German preparation whose composition is a, 

 jealously guarded secret. It has been used by the State 

 Board of Agriculture with fairly good success against the 

 gypsy moth for two seasons, but as it was not found to meet 

 all the requirements of the work its use was discontinued. 

 It is apparently the product of some mineral oil. Prof. 

 John B. Smith, entomologist of the New Jersey Agricultural 

 Experiment Station, who has kindly placed at my disposal 

 the notes made on a series of experiments with this sub- 

 stance, finds that, aside from its value in stopping the pas- 

 sage of insects up and down trees, it has also proved an 

 excellent means of preventing borers from laying their eggs 

 on tree trunks. Against tin 1 sinuate pear borer, which has 

 caused considerable damage to orchards in New Jersey, 

 Professor Smith found it to be a most successful preventive 

 when properly applied. For this purpose it was applied in 

 a coat three-sixteenths of an inch thick over the whole trunk 

 of the tree as far as the lower branches. 



For use against the canker-worms apply the Eaupenleim 

 in a band one-fourth of an inch thick and three to four 

 inches wide around the tree. The Eaupenleim may be put 

 on with a paddle and spread with a still' br,ush. The bands 



