Sprays and Spraying. 53 



Experiment Station has demonstrated that in the dry climate 

 of Eastern Washington one pound to 50 gallons gives equally 

 good results in Controlling codling moth. We have found 

 that two pounds are sufficient in the Willamette Valley. It 

 is quite probable that one pound may be sufficient here, but 

 since this has not been demonstrated we think it best to 

 advise two pounds to 50 gallons for the more humid portions 

 of this State. 



Some growers prefer to prepare the arsenate of lead as it 

 is used. This is but little if any more troublesome than to 

 mix the prepared arsenates in water and should be some- 

 what cheaper. It can be readily prepared after the following 

 formula : 



Arsenate of soda 4 ounces 



Acetate of lead 11 ounces 



Water 15 to 20 gallons 



Dissolve the arsenate of soda in two quarts and the acetate 

 of lead in four quarts of warm water. When dissolved add 

 them to the required amount of water. 



This formula is especially valuable for spraying very deli- 

 cate foliage or for use against insects which are killed only 

 by large amounts of poison, since it can be used upon plants 

 in much stronger Solutions than the other food poisons with- 

 out injury to the foliage. 



If it is desired to use a combined insecticide and fungicide, 

 arsenate of lead may be added to Bordeaux or to lime-sulphur 

 Solution in the same proportion as when water is used. 



BORDEAUX MIXTURE. 



Bordeaux mixture has long been the principal spray used as 

 a preventative of fungus diseases of plants, and while other 

 sprays, notably the l'me-sulohur mixtures, give promise of 

 largely supplanting it for certain purposes, it still remains one 

 of the most important orchard fungicides. 



Bordeaux for winter use may be made as follows : 



Copper sulphate, 6 pounds; 

 Quick lime, 6 pounds ; 

 Water, 50 gallons. 



This is known as the 6-6-50 formula. It should be used 

 only upon dormant trees. 



