116 PEACH LEAF CURL". ITS NATUEE AND TREATMENT. 



It has been possible in the manner just outlined to calculate the 

 total comparative value of all fruit set by the trees of each row, as 

 determined by the actual cash value of fruit of equal quality when 

 matured. By dividing this sum by the number of trees in the row 

 the average comparative value per tree of all fruit set is shown, both 

 for sprayed and unsprayed rows. While these average values do not 

 represent the money actually obtained, as in the case of the preceding 

 table, they accurately show the average values for comparison of all 

 fruit set by the trees, as determined b}^ the market price of that fruit 

 which the trees were able to bring to maturity. For these reasons 

 the figures for the different rows may be rightly compared, and the}^ 

 fairly determine the comparative values of the 35 sprays tested in the 

 block, so far as those values relate to the quantity and quality of the 

 fruit. 



To further facilitate the comparison of the values of the spraj^s in 

 increasing the quantity and quality of fruit, as determined by the cash 

 value of such fruit when matured, the results have been reduced to 

 average net gain per cent of the sprayed trees of each treated row over 

 those of the adjoining unsprayed row. For illustration, it may be seen 

 that in row 30. sprayed, the average calculated value of all fruit set 

 per tree would have been when matured ^12.62; in row 31, unsprayed, 

 $3.13. Deducting the calculated average value of the fruit set on the 

 trees of row 31 from that set on the trees of row 30, there is shown an 

 excess of $9.19 in favor of the trees of the sprayed row, and by divid- 

 ing this excess by $3.13, the calculated average value of fruit set by 

 the trees of the unspraj^ed row, there is shown to be a net gain of 268 

 per cent resulting from the use of the spray applied to the trees of 

 row 30. The gain per cent has in this manner been calculated for 

 every spray tested in the block, and it ma}' be seen that on row 21 the 

 spray gave a net gain of 1,028 per cent. 



