DISEASES OF SHADE AND FOREST TREES. 105 



AVitbiii the past few years the demand for white pines for 

 retY'ivstation and for ornamental plantings has been so great 

 that large numbers of the seedlings have been imported from 

 Europe. The disease has been introduced on these seedlings 

 and distributed to many localities in the United States, but 

 fortunately has been kept in subjection. The disease is very 

 destructive to seedlings and young trees and, Destruc- 

 whik nor always destructive, is very injurious veness. 

 on the older trees. Therefore we should use the greatest 

 caution to prevent its getting a foothold in this country. 



Treatment. 



It is not advisable to plant five-leaved pines of European 

 origin. Always use American grown seedlings. Even then 

 the plants should be carefully examined from time to time, 

 and in case the disease appears they should be destroyed im- 

 mediately by burning. There is no known remedy for the 

 disease, and absolutely no safe course to pursue other than 

 burning the diseased plants. 



COBAL SPOTS. 



The coral spots on the bark of trees and shrubs are due 

 to fungi belonging to the genus Xectria. They are readily 

 ivcujLuiized by the small brightly colored red or orange fruit- 

 ing l>odies. There are a number of species, but the most 

 important is JY. cinnabarinna (Tode) Fr. which attacks the 

 maple, horse-chestnut and many other deciduous trees. The 

 fungus gains entrance to its host through wounds, gradually 

 spreads, forming well defined cankers within ^ 



which will be found the highly colored fruiting 

 bodies. When once well established it may spread rapidly 

 from plant to plant and become epidemic. This fungus 

 also attacks currant bushes and pear trees. 



