234 Spraying for Apple Sucker (Psylla mali) 



Plot R. Soft soap 10 lbs 



Paraffin 2 gallons 



Water 100 gallons. 



Almost as effective as Q. 



Plot .8. Soft soap 10 lbs 



Quassia ... ... ... ... 10 lbs 



Water 100 gallons. 



Almost as effective as R. 



Plot T. Soft soap 10 lbs 



Water ... ... ... ... 100 gallons. 



Not so many suckers killed. 



In this experiment the suckers were so numerous that these 

 sprayings had no very marked effect on the yield. Most of the trusses 

 fell off as a result of the injury done to them by the suckers in the young 

 stages. This shows the necessity for preventing the suckers from 

 hatching. 



Conclusions. 



These experiments indicate that lime and salt may be effective in 

 preventing a large proportion of apple sucker eggs from hatching. Lime 

 wash was also fairly effective. 



Soft soap and nicotine, or treacle and nicotine, were the most effective 

 after the suckers had hatched. 



Spraying to prevent the eggs from hatching is not sufficient to keep 

 this pest under control, but should be followed by an application of 

 nicotine and soft soap, or treacle and nicotine, to kill those which have 

 hatched. 



My thanks are due to Messrs drivers and Sons for their kind 

 permission to use their orchard, and for bearing the expenses of the 

 experiments. 



