Periodical Literature 165 



Once the pest breaks out, copper salts, used as sprays, have 

 been found an efficient preventative against its spread. The very 

 effectiveness of this method proves beyond controversy that 

 blight is of fungus origin and not an effect, as some maintain, of 

 meterological factors, frost, drought, etc. 



Bordeaux and Burgundy mixtures alike gave good results but 

 the latter is to be given the preference as it is cheaper and more 

 simply prepared. The requirements of a suitable apparatus for 

 applying the solution are given and numerous commercial brands 

 discussed by Dittmar. Spraying is most effective when done in 

 the summer months. 



The cost of spraying has been found to be high, and this, coup- 

 led with the uncertninty as to the results obtained, has served 

 to discourage resort to this practice, but when considered in 

 relation to the cost of planting fail spots and the permanent 

 damage done to the stand, it becomes quite inconsiderable in- 

 deed. 



Schi'itte tmd Schuttebekdmp/ung. Zeitschrift fiir Farst- und Jagdvvesen. 

 June, 1905, pp. 343 356. 



For successfully combating all the small 

 Fighting insect pests which attack young spruce 



Insects and pine in the nursery rows, satisfactory 



means have not yet been discovered, nor 

 is there any promise of satisfaction until the complete life his- 

 tories of the insects have been worked out. In the meantime, 

 however, shift must be made and practices in agriculture and 

 horticulture noted for possible suggestions. Dr. Eckstein finds 

 one such in the practice of sprinkling white sand on vegetables, 

 especially on early radishes attacked by springtails {Erdjldhe) . 



A note calling attention to this fact suggests that experiments 

 to determine the value of similar treatment of the seedlings be 

 made where these pests appear and gives the source from which 

 the sand for this purpose may be procured. 



It has long been known that certain small insect pests were 

 not found and could not be introduced upon certain soils con- 

 taining very small quartz grains — spicules so small that they re- 

 main suspended in water longer than clay, or for several weeks. 

 Those who have studied the question trace the effects to these 

 finest grains of sand, though it is not entirely clear just how 

 they act. 



Zur Bekdmpfung der kleinen Schddlinge der jungen Nadelholzkulturen ^ 

 Zeitschrift fiir Forst- und Jagdwesen, pp. 356-358, June, 1905. 



