INFLUENCE OF SPRAYS ON THE VEGETATION OF THE TREES. 91 



GROWTH OK HKANCHES AND LKAF lU'DS ON SI'UAVKI) AND UNSPKAYKD 



TKEEiS. 



Besides knowing the action of the disease and of the sprays upon 

 foliage, it is desirable to ascertain their action on leaf buds and the 

 g-rowth of branches. Two months after orowth started - from Mav 

 10-14, 1S95 — a study was made of the orowth of 20 trees in the experi- 

 ment block, 10 sprayed and 10 uiisprayed. The rows seh'cted for this 

 work were Nos. 20 (unsprayed) and 21 (sprayed). These rows were 

 types of the injurious action of the disease and of the beneficial action 

 of the spray applied, which was 5 pounds of copper sulphate and 5 

 pounds of lime. Much time was given to making measurements of the 

 new growth and recording the results, the time being equally divichnl 

 between the 10 sprayed and tiic 1<» unsprayed trees. Typical limbs 

 were measured upon J)oth the lower and upper portions of the trees, 

 and the length and comparative health of the new growth was recorded. 

 The leniJfth of IS!) 1 growth and that which was older was first ascer- 

 tained, and was followed by careful measurements of all spring growth 

 of 1895 arising from wood of 1894 or from that which was older. The 

 results of this work are shown in the following table: 



Table 9. — Records of vieaaurernenf.'^ of Iwaltln/ ami diseased, wood on unsprayed and 



spraijed trees, taken May 10-14, 1895. 



From the footings in the preceding table it appears that the total 

 length of 1894 wood measured upon the unsprayed trees was nearly 

 twice as great as that measured on the sprayed trees. This arose from 

 the scarcity of new growth on this unsprayed wood, hence an equal 

 time given to taking measurements upon each tree included more old 

 wood upon unsprayed than upon sprayed trees. 



