Proceedings, 1921. 151 



and June-berry or saskatoon. In some localities these are so abundant as 

 to constitute a menace to adjacent gardens and orchards, but unless the 

 plants are actually attacked by the pest, isolated patches of these shrubs 

 may be spared for the beauty of their flowers. 



Trees which should be spared. 



Amongst the trees which are immune to the attacks of tent-caterpillars 

 are the conifers, including giant fir, cedar, hemlock, yew, Douglas fir, and 

 pine. Spruce-trees attacked by the spruce-gall aphis may be destroyed. 

 Maples, cascara, arbutus, Osier dogwood, and Nuttall's dogwood are all 

 useful species and should be spared. Nuttall's dogwood is our famous large- 

 flowered species and is practically immune to all insect and fungus pests. 

 It is rapidly becoming extinct in Vancouver except as a garden plant, but 

 is still found in abundance outside the city boundaries. If vacant areas 

 were replanted with this tree it would add much to the beauty of the city 

 and help to prevent the establishment of undesirable species. 



I have endeavoured to show that the tent-caterpillar plague here is 

 due to man's influence on the local flora, and that by using his influence in 

 the right direction and in accordance with natural laws he may not only 

 counteract the present outbreak, but will save future generations from a 

 recurrence of the pestilential conditions we have had to endure for the 

 past three or four years. 



VICTORIA, B.C. : 

 nted by William n. Cullin, rriiiter to the King's Most Excellent Majesly. 

 1921. 



