INSECTS AFFECTING PARK AM) WOODLAND TREES 155 



These palliative measures are advisable only when others can not be carried 

 out, and in order to secure the best result the grubs and pupae should be 

 destroyed every five days so lonij as the pests are seen in numbers. Hands 

 of tar, stick)- tly paper, cotton battiui;", etc., while the\- do no harm, can not 

 be considered as of much value in kecpino; the elm leaf beetle under control. 

 The relatively few grubs caught on a sticky l)and are but a drop in the 

 bucket compared with the mass which complete their transformations. It 

 is worse than useless to attempt to control this or any other insect by 

 boring a hole in the trunk of a tree and inserting therein a compound of 

 any nature. The tree is weakened and unless the chemical be powerful 

 enough to kill the tree, the insects ar(- not affected. 



Bibliography 

 18S9 Lintner, J. A. Ins. N. V. 5th Rep't, p. 234-42 

 '^95 I"^- ^'- ^' • ''t'l I^i'I'i, \>- 1S9-96 



1895 Howard, L. O. V. S. Dep't A;j,rii\ Year IJook, p. 36.5-68 



1896 Lintner, J. A. Ins. N. Y. 12th Rep't, p. 253-64 



1898 Felt, E. P. N. Y. State .Mus. P.ul. 20, p. 1-43 



1899 N". Y. State Agric. Soc. Trans. 59: 279 



1899 Fish. Game and For. Com. 5th Rep't, p. 354-59 



1902 N. Y. State Mus. Bui, 57, p. 1-43 



Elm saw fly 



Ciiiibcx aiiicn'caiia Leach 



A cylindric, coiled, yellowish wliite worm with a black line down the middle of its 

 back, may be met witli in midsummer on willows, cbns, poplars and other trees. 



This species is a rather common one in New York .State antl is usually 

 met with in mon- or less numbers each year. It occurs with us mostly on 

 the willow and elm and is sometimes present in considerable numbers in 

 limited localities. It is not injurious as a rule in N('W York .State, though 

 it might become so under unusually favorable conditions. 



Early history. This species has been noticed in a more or less frag- 

 mentary way by a mmiber of entomologists. Dr C. V. Riley in 1885, 

 recorded a peculiar injury by this pest at Washington D. C. Admiral 



