No. 123.] PLANT PEST CONTROL. 109 



spection is necessary to locate them even on badly infested 

 trees. In the late spring the caterpillar leaves the web and 

 feeds on the young tender leaves, and often completely defoli- 

 ates poplar trees. Spraying the trees thoroughly with arsenate 

 of lead at the time the caterpillars are feeding will keep the 

 insect in check. The Federal government has already held a 

 hearing relative to a quarantine against this pest, and in all 

 probability will prohibit the shipment of willows and poplars 

 from within the infested area. 



Juniper Wehicorm. 

 The juniper webAvorm was found in a few nurseries on Swedish 

 and Irish junipers. When abundant this insect does consider- 

 able damage and causes the tree to become unsightly. It can 

 be controlled by spraying thoroughly with arsenate of lead. 

 This application should be made preferably when the larvae are 

 small. 



Broivn-tail and Gypsy Moths. 



A very few brown-tail moths' nests were found in some of the 

 nurseries in the northern part of the State, but these were 

 readily taken care of. The gypsy-moth inspection, which was 

 started early in September, showed clearly the results of careful 

 management and thorough spraying. The nurseries were found 

 to be freer from this pest than they have been for several years. 

 This condition was of great assistance to us in our inspection, 

 and allowed us to issue certificates to the larger nurseries in 

 several cases before their shipping season was well under way, 

 thus relieving us of the necessity of having a man stationed at 

 the nursery. 



A total of 164 nurseries were inspected and 153 certificates 

 issued. In addition, 126 licenses were issued. These licenses 

 cover the sales of nursery stock made by agents as distin- 

 guished from the actual growers. 



European Corn Borer. 

 The European corn borer work has been carried on in co- 

 operation with the United States government as heretofore. 

 The same methods of field and market inspection continue to 



