REPORT OF THE HORTICULTURIST 147 



SESSIONAL PAPER No. 16 



is, at all seasons of the year, an ornamental shrub, as the abundant bright scarlet fruit 

 remains on the bush all winter. 



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Viburnum Opulus sterile. — Snowball. Height 8 to 10 feet. Tn I)loom second 

 week of June. The almost round clusters of pure white flowers of this shrub are well 

 known. This is one of the most ornamental hardy flowering shrubs, but during the 

 past few years it has been badly attacked by aphis. To destroy these it is necessary 

 to spray the bushes just as the buds are breaking in the spring. This is very import- 

 ant as at this time the eggs are hatching. A second spraying should be given in a 

 few days, and while the leaves are still only partly expanded. Once the insects cause 

 the leaves to curl it is almost impossible to get at them. Kerosene emulsion or whale 

 oil soap may be used for spraying. 



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