FIFTY-FIRST ANNUAL REPORT. HI 



In conclusion, wish to say that through our satisfied customers, we 

 aim to create a demand for Mountain View Brand Fruit, which will 

 absorb our entire production in the future. 



A REPORT OF DUSTING AND SPRAYING EXPERIMENTS AND 

 GENERAL DISCUSSION OF SPRAYING PROBLEMS. 



BY W. C. BUTTON . 



The dusting and spraying experiments carried on by the Horticultural 

 Department in 1921 have been along the lines here indicated: 



(1) Control of brown rot on peaches and plums with particular 

 attention to the holding and shipping quality of the fruit. 



(2) Testing and comparing dusts and spraying materials for the 

 control of leaf spot on cherries and plums. 



(3) Further testing of dusts for the general treatment of apples, 

 pears and peaches. 



(4) The control of pear ps3dla. 



(5) Spraying and dusting grapes for rot and leaf hopper control. 



(6) Anthracnose control on black raspberries with special attention 

 to reducing the number of applications now recommended. 



(7) Developing and testing, new and cheaper forms of dusting ma- 

 terials and the testing of "spicadcrs" in spraying materials. 



(8) Determining if a pie-pink application for the control of scab on 

 apples is necessary or desirable. 



(9) Control of peach tree borer with paradichlorobenzine. 



(10) Testing dusting materials on potatoes for the control of blight, 

 bugs and hoppers. 



(11) Testing dry lime-sulphurs and similar materials for scab and 

 scale control and for the control of peach leaf curl. 



(12) Bud selection work with apples and grapes. 



I shall not attempt to discuss all the lines of work just mentioned but 

 will take up those in which you will probably be most interested. 



PEAR PSYLLA CONTROL. 



Pear psylla has caused serious trouble during the last two seasons 

 and is one of the most difficult of insects to control. The grower has 

 the choice of two methods of control. The first method has been the 

 one generally used here in Michigan and is familiar to most pear growers. 

 It consists of a dormant application either in the fall or spring to kill 

 the hibernating adults. This should be made on clear, bright days in 

 the late fall or early winter after the leaves have dropped and there 

 has been a sharp freeze which will make the insects less active, or it 

 may be done in early spring before the insects become too active. The 

 temperature should be 45° or more so that the insects will be out of 

 their hibernating quarters, but should not be done on days that are too 

 warm as the psylla will be so active that many of them will get away. 

 If this application is made in the fall, use nicotine sulphate (40%) at 

 the rate of ^ pint to 100 gallons water and add about four pounds of 

 soap to this. If the work is done in the spring, use the nicotine sulphate 

 as above or a good miscible oil. The bark on the trunks and main 

 limbs should be thoroughly scraped so as to afford as little protection 

 as possible. This should be done in the fall before the spraying is done. 



