888 



Spraying Experiments. 



[FEB., 



days the foliage of the King of the Pippins was noticeably 

 scorched, and some defoliation occurred ; similar, but 

 slighter, injury occurred on the Worcester Pearmains. 



(5) On June 15th four large standard trees of Blenheim 

 Orange and one large tree of Besspool (Tower of Glamis), 

 in an orchard near Marden, Kent, were thoroughly sprayed 

 in sunny weather with the "full-strength" wash — 25 gallons 

 being sprayed on to the trees. A considerable amount of 

 "scorching" was caused, and defoliation occurred to a slight 

 extent. 



(6) On June 21st 26 trees (Cox's Orange Pippin, six 

 trees Worcester Pearmain, 12 trees; Bismarck, eight trees) 

 growing in the College plantation, were thoroughly 

 sprayed with the lime-sulphur wash at two strengths — "full- 

 strength " (sp. gr. roi) and "half-strength" (sp. gr. 1*005). 

 At the same time 12 trees of Worcester Pearmain were 

 thoroughly sprayed with Bordeaux mixture (made on the 

 formula 4 14 150). "Control " trees of each variety were left 

 unsp rayed. The sprayed trees were closely examined after- 

 wards each day for ten days. No injury was apparent on 

 the sprayed foliage of any variety until the third day, when 

 the leaves on the Cox's Orange Pippin trees which had been 

 sprayed with the "full-strength " wash showed some "scorch- 

 ing." On the fourth day the "scorching" had increased on 

 these trees; and by the fifth day these trees showed severe 

 "scorching" on a large percentage of the leaves, some of 

 which had begun to curl. By this time (the fifth day after 

 spraying) the trees of Cox's Orange Pippin which had been 

 sprayed with the "half-strength" wash showed slight 

 "scorching" on a few leaves, but not to any serious extent. 

 By the seventh day the trees of Cox's Orange Pippin which 

 had been sprayed with the "full-strength" wash had begun 

 to drop the "scorched " leaves; by the eighth day the defolia- 

 tion was more marked. On the Cox's sprayed with the 

 "half-strength" wash no further injury was visible, and no 

 leaves had fallen by this date. On the tenth day the appear- 

 ance of the Cox's which had been sprayed with the "full- 

 strength" wash showed clearly that considerable injury had 

 been done to the trees— defoliation had occurred to a serious 

 extent, quite half the leaves having fallen off. The trees of 



