EXPERIMENTAL SPRAYING AT HIGHMOOR FARM. 91 



summer sprays, the amount of scab appearing on the leaves the 

 following summer was materially decreased.* Lowe and Par- 

 rott working with the control of San Jose scale by means of 

 the lime-sulphur-salt wash in 1902 in New York recorded a 

 reduction in the amount of scab following a single late appli- 

 cation of this spray.t The, Baldwin variety of apples was used. 

 No mention is made of limb infection by scab, but the following 

 significant statement is made with regard to the control of the 

 disease on the fruit during the season following. "Of special 

 interest in this connection also is the fact that although the 

 trees received no treatment except with the lime-sulphur-sait 

 wash, the fruit from the treated trees was practically free from 

 scab, while that of the checks was badly infested." The single 

 spray application was made late in April and was very thor- 

 oughly done. "In many cases the buds had already burst and 

 in some cases the leaves were well out, while in others only 

 the tips of the young leaves were beginning to appear." It 

 may be mentioned also that many of these young leaves were 

 badly burned by the treatment. These injurious effects were 

 temporary, simply tending to delay the appearance of the foli- 

 age somewhat. In a short time it "was as abundant and vigor- 

 ous as in any of the neighboring orchards." 



No cases of limb infection with apple scab have been ob- 

 served on the Ben Davis at Highmoor but the question is fre- 

 quently raised by orchardists as to whether it is safe or advisa- 

 ble to apply a dormant spray of lime-sulphur after the leaf 

 buds have begun to unfold and the flower buds are swelling. 

 To secure data upon this point and upon the question of scab 

 control, a single plot received a late application of dormant, 

 strength lime-sulphur, in addition to the regular spraying with 

 the summer dilution of the same material combined with the 

 usual amount of arsenate of lead. 



*Morse, W. J. and Darrow, W. H. Is apple scab on young shoots a 

 source of spring infection? Phytopahtology 3:265-269. Oct., 1913. 

 Morse, W. J. Spraying experiments and apple diseases in 1913. Bui. 

 Me. Agr. Exp. Sta. 223 120-23, Jan., 1914. 



tLowe, V. H., and Parrott, P. J. San Jose scale investigations. IV. 

 Bui. N. Y. Agr. Exp. Sta. 228:295-297. 1902. (Reprinted in 21st 

 Annual Report of the N. Y. Agr. Exp. Sta. with the same paging, 1903). 



