248 PRODUCTIVE FARMING 



Appendix as the 8 8 50 formula, just after the blossom 

 calyx is shed from the young fruits (Fig. 143). Repeat this 

 spray once or twice at intervals of three weeks. 



Peach Leaf Curl. In early spring, when this disease 

 occurs, the leaves become thickened, curled, and distorted 

 (Fig. 144). The diseased leaves turn brown and fall off. 

 The loss of leaves from this cause may be very severe in the 

 worst cases. The spraying for scale insects will usually 

 keep the leaf curl within control. 





Fro. 142. Brown-rot disease of the peach. Fresh fruit above, last year's fruit 

 clinging to twigs. (Experiment Station, N. J.) 



Peach Yellows. The exact cause of this disease is not 

 yet definitely known, although a great deal of study has 

 been given to it. The real cause may be due to some form 

 of bacteria, as the disease is very contagious in the peach 

 orchard. In the earlier stages of the disease the leaves on 

 some shoots are very abundant and small. Fig. 145 shows 

 the appearance in spring. Wiry shoots are sent out from 

 the main branches. The leaves may even become yellowish- 

 green in color, and quite sticky. In advanced stages of 

 yellows the fruit appears ripe much ahead of its time; the 



