88 PEACH LEAF CURL: ITS NATURE AND TREATMENT. 



The results obtained by the use of eau celeste and modified eau 

 celeste were very satisfactory, but in no case was as high a percentage 

 of foliage saved by them as in the better tests with Bordeaux mixture. 

 The exceptionally high percentage of foliage saved on row 30 with but 

 2 pounds of copper sulphate may be in part due to the fact that the 

 row was an exterior one of the block and next to a driveway, where 

 the trees may have been better nourished than those of interior rows. 

 By comparing the formula used on row 27 with that used on row 35 

 (each containing i pounds of copper sulphate) it will be seen that the 

 saving of foliage was about equal with eau celeste and modified eau. 

 celeste. Comparison of these results with those shown by row 22, 

 which was sprayed with Bordeaux mixture containing the same amount 

 of copper, will show that the latter saved the highest percentage of 

 foliage. 



Ammoniacal coppei carbonate gave less satisfactory results than the 

 preceding sprays, probably owing to insufficient copper. The various 

 results given by the other sprays tabulated require no special comment. 



Another fact is made evident ))y the preceding table. Of two 

 formuhe of the same class, as the Bordeaux mixtures, one containing 

 more of the fungicide than the other, the percentage of foliage saved 

 for each pound of fungicide will be the greater in the weaker spray. 

 Each of the Bordeaux mixtures used in spraying rows 21, 22, 25, and 

 28 contained 5 pounds of lime, but the amounts of copper sulphate 

 used were 5, 4, 3, and 2 pounds, respectively. The total net amount 

 of foliage saved bv these sprays and the net saving per pound of copper 

 sulphate each contained may be thus shown. 



Row 21: 5-pound formula, 634 per cent saved; per pound of copper sulphate, 127 

 per cent. 



Row 22: 4-pound formula, 624 per cent saved; per pound of copper sulphate, 156 

 per cent. 



Row 25: 3-pound formula, 588 per cent saved; per pound of copper sulphate, 196 

 per cent. 



Row 28: 2-pound formula, 584 per cent saved; per pound of copper sulphate, 292 

 per cent. 



These figures shoAV a gradual decrease of the total per cent of foliage 

 saved as the amount of the fungicide is decreased, but a decided incx'ease 

 in the percentage of foliage saved per pound of fungicide. 



COMPARISONS OF WEIGHT AND COLOR OF FOLIAGE FROM SPRAYED AND 



UNSPRAYED TREES. 



Besides the direct loss of leaves through infection by Exoascus defor- 

 mans^ there is an indirect loss through the retarding of growth of such 

 foliage as has not been directly infected by the fungus. A limited 

 examination of this matter was made May 17 and 18, 1895. Two 

 typical trees were selected in adjoining rows, one of which had been 



