40 



Summary. 



The San Jos6 scale is now generally distributed throughout the 

 United States. 



It feeds upon nearl}' all kinds of plants but appears to be most 

 destructive to those of the family Rosacese and a few others. 



Those individuals which are alive in tlie spring become adult 

 and begin to produce young about the middle of June, and young 

 are continually being produced from that time till after frosts 

 come in the late fall. 



The enormous number of young produced quickly causes severe 

 injury or even death to infested trees. 



The crawling young are distributed by birds, insects and winds. 

 Scales in all stages are distributed on infested nursery stock. 



Though this pest has a number of enemies none have as yet 

 shown themselves able to keep it under control. 



Treatment of small plants and trees is most successful by fumi- 

 gation. This is not practicable for large trees on account of the 

 cost, and spraying must be resorted to. This should be done 

 between the first of February and the time the buds open. 



The best spraying material for use on a small number of plants 

 is probably Bowker's Tree Soap, because it is easy to prepare and 

 needs no special kind of apparatus. 



On a larger scale the lime, salt and sulphur wash has proved 

 more effective but is rather difficult to prepare. 



When a tree is covered with the scale it is hardly worth treating 

 and should be destroyed at once. 



The oyster-shell scale young hatch about the first of June, and 

 may be destroyed at this time by spraying twice with kerosene 

 emulsion or Bowker's Insect Emulsion. 



The young of the scurfy scale also hatch about the first of June, 

 and the best treatment for them is the same as for the oyster-shell 

 scale. 



Any of the treatments suggested for the San Jos6 scale will also 

 destroy the oyster-shell and scurfy scales. 



