DIPPING AND FUMIGATION OF NURSERY STOCK 33 



spray for soft bodied insects like the plant lice. It is usually used at the 

 rate of one gallon of nicotine sulphate to about 800 gallons of water. In 

 using it as a dip for San Jose scale on dormant trees it was used at the rate 

 of one gallon of nicotine sulphate to 100 gallons of water. The following 

 tables show the results obtained. 



TABLE 28. APPLES TREATED IN 1920 



Nicotine sulphate seemed to have killed all the scale on the peach 

 and pear but on the apples it gave very poor results. It also caused con- 

 siderable injury to the plants treated. Evidently it should not be used 

 as a dip in controlling San Jose scale on nursery stock. 



