PEACH SCAB AND ITS CONTROL. 53 



These results show (1) that the sulphur paste and self -boiled lime- 

 sulphur, respectively, controlled scab in a highly satisfactory manner 

 and with remarkably similar results (plats 9, 14, and 15) ; (2) that the 

 omission of the first application materially increased the amount of 

 insect injury and diminished the amount of merchantable fruit (plats 

 11 and 12) ; (3) that the second application was, as indicated by pre- 

 vious field experiments and subsequent laboratory studies, primarily 

 responsible for scab control (plats 9, 10, 13, 14, and 15) ; (4) that in 

 northern Georgia three applications of spray are necessary for the 

 satisfactory commercial control of scab, rot, and the curculio upon the 

 Elberta and similar midseason varieties; (5) that the sulphur paste 

 at the rate of 5 pounds in 50 gallons was in sufficiently strong dosage, 

 giving apparently as good results as 8 pounds in 50 gallons used 

 comparatively (plats 9 and 9B) ; and (6) that the timing of applica- 

 tions on plats 9 and 14 was satisfactory. 



Plats 16-22: Belle. 



The summarized results from the more important Belle plats are 

 given in Table X. Certain data which can not be incorporated in the 

 table are as follows: 



Supplementary notes. — Plats 16 and 18 when carefully noted at harvest time were 

 indistinguishable in their results from plats 20 and 21, respectively, except for the 

 prevalence of a considerable amount of superficial insec:t injury. Owing to the 

 unusually light attack of the curculio, the omission of the first application was thus 

 attended by very little loss. This condition, however, appears to be quite unusual 

 for the section, and these results do not justify the risk of omitting this treatment in 

 commercial orchards. 



The results of plats 17 and 19 were so similar at harvest time that counts were made 

 from plat 17 only. A like similarity occurred in the cases of plats 20, 20A, and 21, 

 results being taken fxom 21 only. 



These results show (1) that the sulphur paste and seH-boiled lime- 

 sulphur, respectively, controlled scab in a highly ef&cient degree and 

 with remarkably similar results (plats 20 and 21) ; (2) that the omission 

 of any one of these three applications would have been unwise (plats 

 16, 17, 18, and 19) ; (3) that the second application was primarily 

 responsible for scab control (plats 17, 19, 20, 21, and 22) ; (4) that in 

 northern Georgia three applications of spray are necessary for satis- 

 factory commercial results on the Belle and similar midseason varie- 

 ties; and (5) that the substitution of the sulphur paste for seK-boiled 

 lime-sulphur in the third treatment on plat 20A in nowise lessened 

 the efficiency of the schedule, the substitution having the advantage 

 of precluding the possibility of spray-stained fruit at harvest time. 



The Spray Schedule. 



While this discussion is concerned primarily with peach-scab con- 

 trol, it must consider incidentally the control of brown-rot and the 



