262 Bulletin 144. 



Summary on Treatment of Sa?i Jose' Scale. 



1. Whale-oil soap used at the rate of two pounds to a gallon of 

 water will kill the scale, but its use is more or less restricted on account 

 of its consistency when cold and from the fact that it injures the foliage 

 and buds if they are in other than a dormant condition. Page 258. 



2. Kerosene applied at the rate of one part kerosene to four of 

 water will destroy the scale. Page 258. 



3. The results of spraying in the spring compared with those 

 obtained from late fall or early winter applications indicate that the 

 scale is more susceptible to the action of insecticides in the spring than 

 in the fall. Page 260. 



4. Whale-oil soap in solution may be applied by means of a pump 

 while it is hot, but after it becomes cold a brush or some similar imple- 

 ment is necessary to do thorough work. A spray pump with kerosene 

 attachment is the most convenient apparatus for applying kerosene. 

 Page 260. 



5. There are several insects and fungous enemies of the scale but 

 it is yet doubtful if they are of much economic importance in the 

 north. Page 261. 



6. The San Jose scale does not seem to be very difficult to kill 

 when insecticides are brought in contact with it. The difficulty arises 

 chiefly from the fact that the scales are often more or less protected by 

 the rough bark, crevices and other natural conditions of the host, 

 and from the rapid increase of the pest. 



7. Great care and thoroughness are of paramount importance. 

 When the work is thoroughly well done and frequently repeated, 

 satisfactory results may be expected. Page 261. 



H. P. Gould. 



