The European Elm Scale 19 



two elms were well washed down with a strong stream from the gar- 

 den hose, the nozzle of which had one small eircula'- outlet and threw 

 a strong, round stream. Every bit of bark was washed; from twig 

 to trunk and down to the ground. The trees were vigorous and young, 

 just coming into leaf ; the washing was done at noon of May 1st, 1907. 

 Both trees made an excellent appearance through the following 

 summer, in strong contrast to other trees not so treated. On December 

 27th, 1907, a searching examination of one of these trees showed that 

 it was almost wholly free from winter larvae. The bark looked unus- 

 ually healthy and clean, and though it presented many long and deep 

 crevices such as form the usual hiding places of the larvae, almost 

 none at all were to be found. A few dead females in the forks of some 

 small twigs showed that they had escaped both the lime-sulphur and 

 the stream from the garden hose. There is no reason for spraying 

 or washing this tree in 1908. 



LOT IV 



Four cork elms twenty-five or thirty years old and about forty 

 feet in height ; in August, 1906, these trees were so badly infested that 

 the limbs were nearly all dead and had been deserted by the insects, 

 which drop to the ground upon the death of a limb in the summer 

 time. These trees were headed back to the trunk in the autumn leav- 

 ing nothing but the stubs of the limbs with a few living twigs. On 

 February 12th, 1907, they were sprayed until all the bark was wet 

 and dripping with lime-sulphur. In the course of the following sum- 

 mer they were well washed at intervals by the gardener employed 

 about the grounds who kept the bark and the undersides of the leaves 

 clean by means of a strong stream of water from the garden hose. 



The result of trimming, spraying and washing these elms was good. 

 They put out a vigorous growth of leafy twigs and looked healthy and 

 vigorous through the summer, promising an entire recovery from the 

 effects of the Elm Scale. Trees in an adjoining yard which were sim- 

 ilarly infested and which were trimmed in the same way, but which 

 were not sprayed, made a stunted and sickly growth. 



LOT V 



Six young cork ebns about twenty-five feet in height, Mill Street, 

 Eeno, Nevada. Bark rough with projecting plates and ridges of cork, 

 trees planted too close together, branches interlocking, making thor- 

 ough spraying difficult. In October, 1906, they showed marked evi- 

 dence of injury, for many of the smaller branches were dead or dying 

 and the leaves of infested branches had turned yellow. A thorough 

 application of lime-sulphur was made on February 12th, 1907 ; eight 



