1022 ANNUAL REPORT OF THE Off. Doc. 



POTTASSIUM SULPHIDE SOLUTION. 



(Liver of Siilpliui-.) 



Totassiuui sn]i)liide, i to 1 ounce. 



^^'atel•, 1 «^allon. 



Particularly good for surface mildews but loses its strength upon 

 standing, so should be used at once after making. 



SULPHATE OF IRON AND SULPHURIC ACID SOLUTION. 



Water (hot), 100 parts. 



Iron sulphate (gi-eeu vitriol), . . . .as much as the water will dissolve, 

 t^ulphuric acid (commercial), 1 part. 



Make the mixture with much care, as heat is produced. Use on 

 I»!ants when dormant only, applying with brushes or sponges, as 

 the solution is injurious to spra^diig machinery. 



CORROSIVE SUBLIMATE. 



This dissolves slow'ly and but slightly in w'ater. The process may 

 be hastened by heating the water. 



GENERAL REMARKS. 



In the treatment of fruits by sprays it should be remembered that 

 the substances used are in almost every case poisonous. It is ac- 

 cordingly necessary to avoid spraying at times when fruit is nearly 

 ripe, both on account of the possibility of placing poison on the fruit 

 just before it is picked, and because of the danger of staining it, as 

 would be the case if certain solutions were used. 



iSpraying solutions often need to be carefully strained, and it is 

 advisable to do this when putting them into the barrel or other re- 

 ceptacle from which they will pass through the spray pump. Noz- 

 zles will clog from larger lumi)s in the fluid, and care should be 

 taken to avoid this as far as possible. Every pump should have an 

 agitator attached to keep the mixture well stirred in the barrel, and 

 it should not be expected that the same nozzle will do first class 

 work with every spraying mixture given. Some nozzles are especi- 

 ally adapted to one kind of spray, and others to other sprays. 

 Above all, an intelligent knowledge of what is causing the injury, 

 and exactly hov>' and when to take the proper steps to control it, 

 should be one of the ingredients addi^I to everv formula here given. 



