Insecticides and Fungicides. 243 



which are infested with scale insects. It has also been used in the East to 

 fumigate scale-infested deciduous fruit trees. Although very efficient the pro- 

 cess is so much more expensive than spraying tliat I do not recommend its 

 use in this State. 



Many nurseries now have specially prepared houses, or fumigatoriums. in 

 ,which to fumigate infested stock. For dormant stock the chemicals are used 

 in the following proportions, for each 100 cubic feet of space inclosed: 



Cyanide of potassium (OS per cent) 1 ounce 



Sulphuric acid 1 ounce 



Water 2 ounces 



Place the water in an earthenware or wooden receptacle, add the acid and 

 when all is ready drop in the cyanide of potassium, close the door and keep 

 it closed for at least forty minutes. Do not attempt to re-enter the house until 

 it has been thoroughly ventilated. 



Greenhouses may be fumigated to destroy plant-lice, mealy-bugs, slugs. 

 millipedes, etc., by using the above formula for each three and fifty cubic feet 

 of space, and keeping the house tightly closed for fifteen or twenty minutes. 

 Previous arrangements should be made for opening the ventilators from the 

 outside. 



fungicides. 



21. Bordeaux Mixtuee for Dorm.\nt Pl.\nts. 



Bordeaux mixture is perhaps the most generally useful of all spraying com- 

 pounds. It is the principal remedy for fungus diseases, is of some value 

 as an insecticide, has a beneficial effect upon plants independent of its effect 

 xipon their insect and fungus parasites and may be vised for most purposes in 

 place of water in the preparation of the arsenical sprays Xos. 1 to 4. 



Bordeaux for winter use may be made as follows : 



Copper sulphate fi 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. 



22. Bordeaux Mixture for Plants in Foliage. 



When the trees are in leaf the following 4-6-50 formula is used : 



Copper sulphate 4 pounds 



Quick lime 6 pounds 



Water 50 gallons 



23. Bordeaux ISIixtuee for Peach and Other Tender Plants. 



For spraying peach foilage it is best to use the still weaker .'i-e-SO formula : 



Copper sulphate .3 pounds 



Quick lime pounds 



Water 50 gallons 



To prepare Bordeaux mixture dissolve the copper sulphate in hot or cold 

 water in a wooden or earthern vessel. Slake the lime, using only sufficient 

 water to insure slaking. The lime should not be allowed to become dry while 

 slaking nor should it be submerged in water. After the lime is slaked add 

 water and stir until the "milk of lime" is of the consistency of cream. The 

 best results are obtained by diluting the milk of lime and the copper sulphate 

 solution each to 25 gallons and then pouring these two dilute solutions together. 

 The lime solution should always be strained through a sieve to exclude particles 

 that might clog the nozzles. A brass wire sieve, 20 mesh, large enough to fit the 

 head of a barrel or the opening into the spray-tank will prove a great con- 

 venience. 



