97 



brauohes, and during the days Avhen the temperatures rise 

 ;s liigh as 40 degrees, F.,it is not an uncommon thing to 

 observe these flies on the sunny side of the tree in great 

 nmnbers. You have probably observed them under those 

 situations. '' 



Now then we are recommending that in orchards that 

 tire badlj' infested, that one go into the pear orchard during 

 November or December, after a period of cold weather, 

 when temperatures are rising a little, about 40 degrees F., 

 and thoroughly spray the trees, preferably with nicotine and 

 soap. We recommend this mixture because it is absolutely 

 safe at that season of the year. 



Now the object in advising that treatment is that the 

 flies are then out in great numbers and are in positions 

 v.'here they can be thoroughly coated with the spray. If 

 the spraying is well done, very few of the flies are left to 

 make their appearance on the tree in the spring. We con- 

 sider this spraying the chief step in the control of the pear 

 psylla. 



There is one other treatment that one can make which 

 does not constitute an extra operation in most pear orchards 

 where San Jose scale exists, and that is delay your spraying 

 cigainst the scale until the cluster buds, or the blossom ])uds 

 are beginning to separate at the end. I am referring now to 

 those little green blossom buds, when they are about ready 

 to open up and form a cluster. However, spray before they 

 have separated at the ends, using lime sulphur solution at 

 winter strength, one to eight. You may think if you spray 

 thoroughly to control the scale you would injure the blos- 

 som structures, but our experience shows that there is very 

 little danger of injury. 



You may ask, why delay the treatment until that time? 

 The reason is this : In most years, by that time, the pear 

 psylla has deposited all of its eggs and the eggs of the pear 

 ]>sylla are then very sensitive to a thorough spraying of the 

 lime sulphur solution. These are two treatments that I 



