94 



PEACH LEAF CURL*. ITS NATURE AND TREATMENT. 



chapter, and it will here be sufficient to state that the growth on the 

 sprayed and unspra3^ed trees could be fairly compared. The sprayed 

 trees were treated with the sulphur, lime, and salt spray in the winter of 

 1892-93. Leaf curl developed seriously in the orchard in the spring of 

 1893. The sprayed trees saved their foliage and bore a full crop of fruit 

 in 1893, while the unsprayed trees, everywhere surrounding those that 

 were sprayed, lost the spring foliage and most of the fruit. All trees 

 stood upon moist, deep, rich river bottom land, where growth could 

 continue throughout the season. In the fall of 1893 the unsprayed 

 trees had apparently largelv overtaken the sprayed trees in growth, as 

 the former had carried little crop, while those that were sprayed had 

 matured a full crop. That the unsprayed trees were not, however, 

 fully abreast of the sprayed trees when growth ceased in 1893, is 

 shown by the measurements recorded in February, 1891: (table 11). 

 These measurements were made on various sides of each tree, and on 

 lower and upper limbs, and as a week was devoted to the work, the 

 measurements are believed to be sufficiently extensive to give reliable 

 results. 



Table 10. — Gain in number of lateral shoots and spurs from old wood on sprayed trees. 



The above table shows that 13 per cent more buds had pushed into 

 shoots and spurs on the sprayed trees, in the summer of 1893, than on 

 the unsprayed trees. All represented new growth from old wood. 



The following table shows that the length of the new growth for the 

 entire season of 1893 on the spraj^ed trees was 6.4 per cent more than 

 that produced on the unsprayed trees. This was in spite of the facts 

 that the unsprayed trees were so situated that growth could continue 

 until frost and that they had not carried a crop of fruit as had the 

 sprayed trees: 



Table 11. — Gain in length of new growth in favor of sprayed trees. 



