80 



One hundred cubic feet of tented space requires 1 oz. of pot- 

 tasium cyanide or y^ oz. of sodium cyanide for a basis dose, which 

 is used for most fumigation work, and is. known as Schedule No. 1 

 for potassium cyanide and Schedule A for sodium cyanide, and 

 they can be varied for any special infestation or condition of tree 

 or atmosphere. For instance, a bad infestation of Mealy Bug- would 

 require \ l /2 this schedule dose. 



The residue remaining in the pots after treatent of each tree 

 should be a green liquid, not very poisonous, but if lumps of cyanide 

 remain in it undissolved from wrong proportioning or poor ma- 

 terial, any animal or fowl eating it would be poisoned, and burying 

 is the better plan for its disposal if the work is done near houses 

 or barns. Care should be used not to drop any cyanide in handling 

 it for the same reason. Operators should very carefully avoid in- 

 haling the gas also, as it is very poisonous. 



When to Fumigate 



If the trees have only Black Scale, fumigate from September 10th 

 to February 1st, and that time is as good as any for the other scales 

 and bugs except the Longulus Scale, which seems to require treat- 

 ment as early as August 15th as noted in the description of that 

 scale. 



Insecticides and Sprays 

 1. Lime Sulphur: 



Quicklime -. 33 pounds 



Sulphur _ 66 pounds 



Water 200 gallons 



Sift sulphur through box with screen bottom into boiling tank 

 with 50 gallons of water. Add the lime and boil 45 minutes to 

 one hour. Stir frequently. Strain through cheese cloth or burlap 

 and dilute to make 200 gallons. If extra lime is desired strain in 

 milk of lime when spray is ready for use. 

 l*/2. Self-boiled Lime Sulphur: 



Fresh stone lime (not air slacked) 32 pounds 



Flowers of sulphur 32 pounds 



Water to make 200 gallons 



Place the lime in a barrel and pour on enough water to cover 

 it. As soon as it begin to slack, sift in the sulphur so that all 

 lumps will be broken up fine. Stir constantly, and add water 

 slowly to make a thick paste, then, as soon as the slacking is com- 



