EXPERIMENT STATION BULLETINS. 397 



Prepared in either of the above ways this solution is a clear blue liquid. It 

 is especially suited to spraying plants which are maturing their fruit as it leaves 

 no conspicuous stain. Besides it possesses high value as a fungicide. 



This solution is not suitable for combining with Paris green and other arsenites 

 without the addition of lime in amounts two or three times that of the poison. 



Note. — Neither iron, nor tin vessels should &e used in preparing solutions con- 

 taining salts of copper. 



POTASSIUM SULPHIDE SOLUTION. 



Sulphide of Potassium (Liver of sulphur) 1 ounce 



Water 3 gallons 



The sulphide dissolves readily and forms a clear solution suitable for com- 

 bating the powdery mildews especially on the gooseberry. The solution should 

 be freshly prepared before using as it does not keep well. 



GENERAL SPRAYING RECOMMENDATIONS. 



While treatment has been suggested in connection with the description of 

 each disease mentioned in this bulletin, some general suggestions for spraying are 

 here given in such form as to enable the grower to determine more readily when 

 and blow often to spray. These recommendations are intended to cover the needs of 

 the plant in case of attack by any or all of the diseases most common to it but 

 the grower's judgment should at all times be exercised in the matter. Thus in 

 some cases the number of sprayings may be fewer than those here given depend- 

 ing upon the prevalence of the different diseases. In some cases it may be 

 advisable to repeat a spraying at once as in the event of a heavy rain that washes 

 the fungicide from the plant. On the other hand, if the plant is already well 

 coated with an effective fungicide there will be nothing gained by adding more. 



Fungicides and insecticides can usually be combined and applied at one opera- 

 tion thus reducing the labor and expense in combating both enemies. See Michi- 

 gan Experiment Station Special Bulletin No. 24.) 



APPLE. 



1. Before buds open use copper sulphate solution A. 



2. Just before blossoming use Bordeaux (with an insecticide). 



3. About a week after blossoms fall, with same preparation as No. 2. 



4. Ten days or two weeks later, repeat 3. (Sometimes omitted.) 



5. About August 1 for late varieties, repeat No. 2. 



PEAR. 



Spraying recommendations for the apple may be followed; use copper sulphate 

 solution B for last application, if necessary. Cut and burn all branches affected 

 with twig blight as soon as it appears, cutting 6-10 inches below the diseased 

 portion. Repeat this in autumn before leaves drop. 



QUIXCE. 



Follow the general directions for pear, omitting, perhaps the No. 5 application. 



PEACH AND APRICOT. 



1. Before April 1st, copper sulphate solution A. 



2. After fruit sets, Bordeaux mixture, two-thirds strength (with an insecti- 

 cide). 



3. Ten days or two weeks later, repeat No. 2. 



4. In case of brown rot, use copper sulphate solution C. 



5. Repeat No. 4 about once a week if rot continues. 



6. Watch for "yellows" and "little peach," digging out and burning as soon 

 as recognized. 



PLUir. 



1. Cut off and burn all black knot. Before buds open, use copper sulphate 

 solution A. 



2. When fruit has set, use Bordeaux mixture (with an insecticide). 



3. About two weeks later repeat No. 2. 



4. At intervals of two or three weeks, repeat No. 2, if necessary. 



5. When fruit is about three-quarters grown use copper sulphate solution B. 



