52 Agricultural Experiment Station, Ithaca, N. Y. 



spray a large tree at this time as there is but little foliage. A second 

 spraying should be made about a week or ten days later or before the 

 blossoms open. If these two applications be thoroughly made, we 

 believe that the pest will be so greatly checked as to render any further 

 spraying for it alone unnecessary. 



Do not spray when the trees are in bloom. If the trees are not 

 sprayed when the buds are opening and the pest thus allowed to get a 

 start, it may pay to spray the trees later, even when the larvae 

 are protected in their nests. Mr. J. Fletcher says (Rept. for 1891): 

 "Although ]ike the Leaf-rollers they enclose themselves in cases made 

 of leaves drawn together, they have to continually draw in fresh 

 material, and I found last season tliat where an orchard was severely 

 attacked at the same time by this insect, the Canker worm {Anisopteryx 

 pomeiaria,) the Lesser Apple Leaf Roller {Teras malivorana), and the 

 Oblique-banded Leaf -roller [Cacaecia rosaceana), all were much 

 reduced in numbers by a single spraying with Paris Green." 



We have not had an opportunity to try any extensive experiments 

 in spraying for this pest early in the spring. However, in the spring 

 of 1892, four trees on which there were several larva? in hibernation 

 were sprayed the first time April 1"). Owing to frequent hard showers, 

 it was almost impossible to keep any of the poison on the opening 

 buds. By May 15, the trees had been sprayed five times, using one 

 pound of Paris Green to from one hundred and fifty to two hundred 

 gallons of water. This excessive spraying resulted in considerable 

 injury to the leaves and flowers. But enough of the larvre were killed 

 to lead us to believe that m an ordinary season the treatment recom- 

 mended above will prove sufficient to prevent the pest from doing 

 serious damage. In spraying large trees it will be necessary to have 

 one of the Barrel Spraying Machines. Use as fine a spray as possible. 



To summarize, it is not practicable to try to check this pest in either 

 the adult or egg stages, or while it is in hibernation as a half grown 

 larva. Undoubtedly it can be checked somewhat by sprajdng in July 

 when the larvae are at work on the under side of the leaves. But the 

 best time to combat the pest the most profitably and successfully is in 

 spring when a little poison can be easdy sprayed upon the opening 

 buds; and thus the little larva, hungry from its long winter's fast, will 

 be quite certain to get the fatal dose at its first meal . 



MARK VERNON SLINGERLAND. 



