32 



aod flat headed borers, aud also Avherever it is desirable to prevent 

 insects from ascending- or descending the trunk. A broad band, put on 

 thickly, is recommended against the codling moth, and in cities against 

 the white-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 ^ew York City is, for 

 25 pounds, $3.75; 50 pounds, $6.75; 100 pounds, $12.75; barrel, from 

 250 to 275 pounds net, about $25. Dendrolene is supplied free on 

 board at 6 cents a pound in New Brunswick, N. J., in lots of 25 to 50 

 pounds, and at 5^ cents in lots of 100 pounds and over. The material 

 can be washed from the trunks of the trees if desired by a strong potash 

 mixture, say 1 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 was 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. 



Mr. Fernald said he had experimented with the lime against the 

 spring canker-worm, in conjunction with other experiments with i)rint- 

 er's ink, the latter applied on paper bands, and bandiug 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 larva^ efl"ected their 

 passage over the latter chiefly on cool mornings, which indicates that 

 very diverse efiects may be expected in diflereut climates. He thought 

 that of the three substances experimented with the imported or rau- 

 penleim gave the best results. 



Mr. Howard asked what ijeriod 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 i^re- 

 ceding 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 through 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 raupenleim and an American material, Menzel's brand. 

 He had found considerable difference in imported material obtained in 

 different years. Sometimes it had proved very unsatisfactory, and he had 

 discontinued its use for other methods which he deemed more advisable 



