INJURIOUS AND BENEFICIAL INSECTS 47 



furic acid, 1 ounce by measure, water 3 ounces by measure, these 

 amounts for 150 -cubic feet of space; expose trees at least J hour. 

 Prepare tight chamber, mix acid and water by pouring acid slowly, 

 stirring frequently, intO' the water. Use earthen or glass vessels, 

 and drop cyanid into the diluted acid, closing chamber at once. 

 Small fruit trees in orchards can be fumigated under a tent before 

 the buds start, using 1 pound of the cyanid to 100 cubic feet space, 

 without injury to the trees, and this will result in killing most, if 

 not all, the San Jos^ scale. 



Carbon bisulfid 1 pound to 1000 cubic feet space; place in shal- 

 low dishes near top of chamber. 



These substances are deadly poisons, the acid will corrode or eat 

 many things, carbon bisulfid is inflammable and explosive in the 

 presence of any fire. Handle all with eootreme care. 



Insecticide and fungicide. The poisoned bordeaux mixture is a 

 most valuable combined insecticide and fungicide and is rapidly 

 coming into favor. The bordeaux mixture may be prepared as 

 follows : dissolve 6 pounds of copper sulfate (blue vitrol) by put- 

 ting it in a bag of coarse cloth and hanging this in a vessel con- 

 taining 4 to 6 gallons 'Of water. For this purposie use an earthen 

 or wooden vessel. After the copper sulfate is dissolved', dilute 

 with water to 25 gallons. Slake four pounds of lime and add 25 

 gallons of water and then mix the two and keep thoroughly 

 stirred while using. When applied on peach foliage, it is advis- 

 able to use an additional 2 pounds of lime. To each 50 gallons 

 of bordeaux mixture as prepared above, add four ounces of paris 

 green, london purple or paragrene. The amount of arsenite of 

 lime solution to be used with bordeaux mixture is given on page 

 45. Arsenate of lead can also be used in the same amounts with 

 this fungicide as with water. Bordeaux mixture alone is an ex- 

 cellent substance to apply to plants attacked by flea beetles, and 

 when poisoned, forms one of the best general purpose sprays. 



