ENTOMOLOGICAL SOCIETY OF ONTARIO. 73 



It "was statfd by the grower conducting the experiments that the dendroUne killed 

 the borers that were in the tree wh( n it was applied, while the raupenleim did not. This 

 fact may have been accidtntal and is not to be expected under ordinary conditions. The 

 material is recommended for application to fruit trees to prevent attacks of round and 

 flat-headed borers, and also wherever it is desirable to prevent insects from ascending or 

 descending the trunk. A broad band, put on thickly, is recomoiended against the cod- 

 ling moth, and, in cities, against the wihite- marked tussock moth and the bag worm. It is 

 suggested that applied on trunks on which insects like the pear psylla hibernate it will 

 destroy these insects by preventing their coming out in the spring. 



The cost of the raupenleim, free on board in New York city is, for twenty five pounds, 

 $3,75 ; fifty pounds, |b.75 ; one hundred pounds, $12.75 ; barrel, from 250 to 275 pounds 

 net, about $25. Dendrolene is supplied free on board at six cents a pound in New 

 Brunswick, N. J., in lots of twenty-five to fifty pounds, and at 5^ cents in lots of one 

 hundred pounds and over. The material can be washed from the trunks of the trees if 

 desired by a strong potash mixture, say one pound of potash in a gallon of water. As 

 the substance is a mineral product, it does not become rancid. 



In answer to a question as to the composition of the lime, Dr. Smith stated that it 

 ivas chiefly, if not entirely, crude mineral oil. 



Mr. Southwick read extracts from a letter from agents for an imported insect lime, 

 which were very extravagant in statement. 



j\[r. Fernald said he had experimented with the lime against the spring canker- 

 worm, in conjunction with other experiments with printer's ink, the latter applied on 

 paper bands, and banding the trees also with cotton, two or more bands being placed on 

 the same trunk. Very few worms passed over the cotton bands, considerable numbers 

 over the ink bands and a few over the lime. The larvje chiefly efi'ected their passage 

 over the latter on cool mornings, which indicates that very diverse effects miy be expected 

 in diflerent climates. He thought that of the three substances experimented with the 

 imported or raupenleim gave the best results. 



Mr. Howard asked what period of the year was included in the five months during 

 which the lime was on certain trees. 



Mr. Smith replied that they were the five months immediately preceding the middle 

 of July. 



Mr. Lintner suggested that the lime be so thinned down that it could be sprayed, 

 to facilitate application. 



Mr. Smith stated that this thinning would be especially desirable for work against 

 scale insects, but that even when considerably thinned it could not be sprayed thiough 

 an ordinary spraying nozzle. 



Mr. Forbush said he had not his notes with him and therefore could not give in 

 detail his experience with lime, which had been very extensive. He had used the raup- 

 enleim and an American material, Menzel's brand. He had found considerable difierence 

 in imported material obtained in diflerent years. Sometimes it had proved very unsatis- 

 factory and he had discontinued its use for other methods which he deemed more advis- 

 able for his work. He said that some insects can cross the lime, but when it is warm, 

 and especially on sunny days, it is a nearly perfect barrier. On cold days, and parti- 

 cularly in stormy, rainy weather, insects can pass it with comparative ease. On smooth 

 bark it will run somewhat, and will also crack or break, especially on rough-barked 

 trees. German authors, he stated, claim that no injury results to the trees from its 

 application, and his own experience was confirmatory of this. The only injury he had 

 noticed came from the scraping prior to the application of the lime or injury from 

 the lime as a result from such scraping of the bark. On dusty streets the lime soon crusts 

 over and may be crossed by insects, and pine needles adhering to it produce a similar 

 result. It is claimed by some that limed trees are not frequented by birds, but this 

 idea was not confirmed by his own experience. He had used various machines and 

 various devices bad been constructed by the commission for the application of the 



