DIPPING AND FUMIGATION OF NURSERY STOCK 



17 



TABLE 6. PEACHES TREATED IN 1920 



*In this treatment Sodium cyanide (NaCN) was used. 



One hundred per cent of all the scale was killed in every case in 1920. 

 Effect of hydrocyanic-acid gas upon San Jose scale on pear. 



TABLE 7. PEARS TREATED IN 1920 



*In this treatment Sodium cyanide (NaCN) was used. 



Practically the same results were obtained upon pear as upon peaches 

 and apples. 



Effect of hydrocyanic-acid gas upon San Jose scale on plum. 



TABLE 8. PLUMS TREATED IN 1917 



