DIPPING AND FUMIGATION OF NURSERY STOCK 



27 



Each treatment killed 100 per cent of the scale, except the first which 

 killed 99.66 per cent. 



TABLE 19. PEARS TREATED IN 1920 



All gave good results except the barium tetrichloride sulphide which killed 

 only 90 per cent of the scale. 



TABLE 20. PLUMS TREATED IN 1917 



The scale on the treated trees were all dead.. 



The lime-sulphur solution used at both strengths caused considerable 

 injury. There was not a great deal of difference in the strength of the two 

 solutions used and some authorities claim that lime-sulphur used at the 

 rate of 1 gallon lime-sulphur to 9 gallons of water will give as good results 

 as 1 gallon lime-sulphur to 7 gallons of water. At the end of the first two 

 months and also at the end of the first year, a larger percentage of stock 

 treated with the weaker, or 1-9 solution, was dead, which seems to indicate 



