792 CONNECTICUT EXPERIMENT STATION REPORT, 19O7-I908. 



way on account of codling moth and tent caterpillar. In Baile/s 

 experiments* in Central New York, Paris green (one pound in 

 two hundred gallons of water) gave as good results as a mixture 

 twice as strong, and seemed more effective than lead arsenate 

 used in similar proportions. In spraying trees at Stonington to 

 kill gypsy caterpillars, last summer, lead arsenate was used in 

 the proportions of three pounds in fifty gallons of water, and 

 this was later increased to five poimds. Some of the trees and 

 shrubs were infested with canker worms, which were readily 

 killed. Quaintance's experimentsf also confirm this. 



Canker worms can be controlled by a careful and thorough 

 spraying with lead arsenate (three pounds in fifty gallons of 

 water) , or with Paris green (one pound to fifty gallons of water, 

 three pounds lime), but these quantities can be doubled if desired. 



Where it is impracticable to spray the trees, canker worms can 

 be controlled absolutely by sticky bands, if properly used. 



How TO Band the Trees. 



The sticky substance may be applied directly to the bark, and 

 this is often done in orchards and on woodland trees, but on shade 

 trees on private places it is often desirable to remove the bands 

 when they are no longer needed, and this can be done if the sticky 

 material is placed upon a separate band. Tarred roofing paper 

 answers the requirements, as it does not absorb the "tree tangle- 

 foot" as cloth would do, and it is fairly durable. If the paper 

 is placed around the trunk, the rough bark has many crevices 

 through which the females can crawl. Hence the reason for using 

 cotton,batting to stop these. 



First place aroimd the trunk about six feet from the ground 

 a strip of cotton batting (cheapest grade) about two inches wide. 

 Then cover this with a band of single-ply tarred paper about five 

 inches wide, fastened at the lap with three sharp-pointed tacks 

 about three-fourths of an inch long. The paper should be drawn 

 snugly enough to press the thick band of cotton into the crevices, 

 but not enough to break the paper. If tacked in many places, the 

 growth of the tree will break the paper. Of fifty-five bands 

 applied in this manner none needed renewing for two seasons, 



* Bulletin loi, Cornell Expt. Station, p. 406. 



t Bulletin 68, Bur. of Entomology, U. S. Dept. of Agrriculture, p. 21. 



