The Bulletin, 



9 



of blossoms have fallen; so we must do it then, even if there are some 

 belated blossoms still on the trees. But it is considered to be poor prac- 

 tice to spray when the trees are in full bloom. 



If rain falls immediately after an application, it must be repeated 

 as soon as the plants are fairly dry again. But if the mixture once 

 gets dried on the foliage, it will adhere very well in spite of rains. 

 From one to two hours will dry it satisfactorily, especially if there is 

 sunshine. 



After a day's spraying, pump a little clear water through the pump 

 and hose to clean them of the mixture, so that there shall be no unnec- 

 essary corrosion. 



Fig. 1. — Just the best time for the second spraying- of apples and 

 pears. The blooms have shed, and the blossom end of the young- 

 fruits is wide open to receive the poison. (After Slingerland.) 



Oil the working parts of the pump and nozzle occasionally. 



If the insect to be combated works mostly on the upper surface of the 

 leaves, the spraying must be done so as to reach the upper surface, and 

 if they work more on the under surface, give attention to that. Use 

 judgment with each pest and fight it according to its habits. 



Special Hints. — Don't forget the poison. There is a tendency to for- 

 get all about the poison when one mixes the two solutions, but the blue- 

 stone and lime do not kill insects. Be sure to add the poison, mixing it 

 carefully first with, a little water, as already explained. 



Bluestone dissolves slowly. If you want to spray in the morning, put 

 the bluestone in the water the evening before, so it will be dissolved in 

 time. It dissolves more quickly in hot water than in cold. It also 



