PEACH SCAB AND ITS CONTROL. 51 



injury resulted from the arsenate of lead. Inasmuch as the second 

 appUcation, being the primarily important scab treatment, was quite 

 heavy, this result is not surprising. The fact that no such deleterious 

 results attended the use of arsenate of lead in combination with the 

 seK-boiled Hme-sulphur indicates strongly that the addition of hme, 

 as in the first apphcation, would have prevented or minimized the 

 injury. If the lime is necessary as a precautionary measure in the 

 first apphcation it would seem equally so in connection with the sul- 

 phur paste in the second. 



Though, unfortunately, no plats in which lime was added to the 

 arsenate of lead and sulphur paste in the second apphcation were 

 included in these experiments, the practicabihty of its satisfactory 

 addition was shown clearly in an adjoining orchard. At the writer's 

 suggestion, the addition of lime, at the rate of 2 pounds to 50 gallons, 

 was made in the second apphcation on the 30,000-tree orchard of 

 the Habersham Orchard Co. In all other respects this orchard was 

 treated similarly to plat 9. The fohage went through the season in 

 excellent condition and the control of diseases was eminently satis- 

 factory. However, the work was, of course, not experimental. 



These observations on foHage injury are presented merely as field 

 notes upon what appeared to be a clear case of arsenical injury. 

 They are not set forth as warranting generalizations, but merely as a 

 further warning that, as would be expected, very considerable injury 

 may result xmder certain conditions from heavy apphcations of 

 arsenate of lead (diplumbic) with sulphur paste. It should be clearly 

 borne in mind, however, that there was no evidence to indicate that 

 the injury was any greater than it would have been had the arsenate 

 of lead been appHed alone. 



RESULTS ON FRUIT. 

 Plats 1-6: Caeman. 



Results were taken at harvest time in the manner previously 

 described, upon representative trees of plats 1, 2, and 6. In all cases 

 the count trees were selected as typical of the plats which they 

 represent. As it reached the proper stage for shipping, the fruit was 

 gathered in successive pickings by the regular orchard employees, 

 being thus harvested in the same manner and at as nearly as possible 

 the same stage as the rest of the fruit of the commercial orchards. 

 The fruit from each tree was picked separately and promptly turned 

 over to the writer for examination. The records for each tree at 

 each picking were thus kept separately throughout. The summarized 

 results of this count work appear in Table X, while certain facts 

 which can not be shown in tabular form are stated as follows : 



Supplementary notes. — ^Under the conditions of these experiments, inasmuch a:^ the 

 plum curculio {Conotracheltis nenuphar Herbst.) injury, scab, and rot were considerably 



