29 



Gypsy and Brown-tail Moths. 



For advice in regard to these pests address the Superintendent of 

 the Gypsy Moth Commission, 6 Beacon Street, Boston, ]\Iass. 



Spruce Gall Louse. 



Swellings at the bases of the smaller twigs, fresh and soft in May. 

 Pick off and burn. Spray thoroughly with kerosene emulsion in 

 April. 



Woolly Aphis on Maple. 



Spray with kerosene emulsion. 



Leaf Spots. 



There are many leaf spots more or less common to shade trees,^ 

 viz : the linden leaf spot (Cercospora), the sycamore blight (Gloeos- 

 porium), oak blight (Gloeosporium,) horse chestnut blight (Phyllos- 

 ticta) and the English hawthorne leaf spot (Entomosporium), which 

 can undoubtedly be controlled to a large extent by spraying with any 

 good fungicide, but the question of treatment depends upon whether 

 the tree is valuable enough to warrant it. 



Sun Scorch. 



Some shade trees are subject annually to sunscorch and wilts 

 which are the result of strong, warm winds when the soil moisture 

 supply is low. Trees growing on lawns in rich soil seldom suffer 

 from these troubles, as the conditions are unfavorable for their devel- 

 opment. When soil is very dry water may be applied by means of 

 a sub-irrigation system installed near the feeding roots. 



Wounds. 



By far the greatest amount of injury to trees from fungi is due ta 

 lack of antiseptic treatment of wounds caused by poor pruning and 

 mechanical injuries. When large pieces of bark are removed from 

 the trunk of the tree an old European method of treatment is some- 

 times used, consisting of carefully scraping the wound and covering 

 it with a mixture of one part lime, two parts cow-manure and 2 parts 

 clay, which is securely bandaged with burlap. Whatever other 

 virtue it has, this mixture probably assists in keeping the parts moist, 

 which would help in the process of healing. 



