33 



for his work, lie 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 cool days, and particuhirly 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 rou<j;h barked trees. Ger- 

 man authors, he stated, claim that no injury results to the trees from 

 its ai)])lication, and his own experience was contirmatory of this. The 

 only injury he had noticed came from the scraping x)rior to the appli- 

 cation of the lime, or injury from the lime as a result of 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 simi- 

 lar 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 had been constructed 

 by the commission for the application of the lime. The necessity in 

 cities or public parks of applying the lime at considerable heights on 

 the trunks to i)revent contact with it on the part of i^assers-by rendered 

 many machines for its application impracticable for his purpose, and he 

 had been compelled to employ chiefly i^addles and trowels. European 

 machines were found to be crude and somewhat unsatisfactory. He said 

 that in Europe the lime was employed also as a coating for egg masses 

 to prevent the escape of the larv?e. The objection to this was that such 

 egg masses Avere very apt to be broken open by squirrels and the larviie 

 thus enabled to escape at the proper time. He thought lime would be 

 of value, particularly against the cankerworm. He had found in cer- 

 tain instances that after lime had been exposed on trees during summer 

 and winter the following spring it was still of a consistency to be of 

 service. 



Mr. Smith said that the dendrolene referred to in his paper is entirely 

 without odor, whereas the European lime smells very strongly of tar. 

 He was of the opinion that this odor was given to the European product 

 to conceal its true composition. 



Mr. Davis had tried wool bands with i)arallel experiments with rau- 

 penleim against canker-worms, and found the latter successful in every 

 instance; but this could not be said of the wool bands. He had found 

 lime impracticable against cutworms, many of them crawling over it in 

 the cool of the evening; and it had not proved entirely satisfactory 

 against the peach borer, as the borers frequently emerged in spite of 

 the coating of lime. 



Mr. Smith said that this would be very probably the case if the 

 application were made to the peach after the larvi>? were in the tree, 

 but that the application would be more successful if used to deter the 

 moth from ovipositing. 



Mr. Southwick said that in his experience he had found the tussock 

 moth larvje so numenms that they had been able to crawl over the lime 

 on account of mere numbers. 

 00412—^0. 2 3 



