Spraying Experiments. 



887 



Allington Pippin and King of the Pippins suffered slightly; 

 Beauty of Bath, Worcester Pearmain, and Peasgood's Non- 

 such showed no appreciable injury. 



(3) On June 4th, in sunny weather, eight trees of Duchess' 

 Favourite in the College plantation were thoroughly sprayed 

 with the "full-strength " wash. At the same time eight trees 

 of Duchess' Favourite and 24 trees of Warner's King (in 

 both cases interplanted in the same row as the above) were 

 thoroughly sprayed with home-made Bordeaux mixture (4 lb. 

 copper sulphate, 4 lb. quicklime (in lumps), 50 gallons 

 water*) ; nine trees of Duchess' Favourite (interplanted in 

 the same row) were left unsprayed as controls. The lime- 

 sulphur wash caused only very slight "scorching" on the 

 foliage of the Duchess' Favourite, and no defoliation 

 occurred ; the Bordeaux mixture on the same variety pro- 

 duced no signs of injury at first, but after four weeks, i.e. 

 at the beginning of July, the leaves began to fall; this con- 

 tinued until, by the end of July, these trees were almost 

 completely defoliated. No leaf-injury or leaf-fall occurred 

 on the "control" trees of Duchess' Favourite. There was 

 clear proof that Bordeaux mixture was unsafe to use at that 

 time of year in a wet season, while under the same weather 

 conditions the lime-sulphur wash, at "full strength," caused 

 no appreciable injury. Another interesting feature was the 

 behaviour of the trees of Warner's King sprayed with Bor- 

 deaux mixture. Here, although the spray had been very 

 thoroughly applied to practically every leaf (so. that the trees, 

 when the spray had dried, looked quite blueish), and not- 

 withstanding the fact that the "scab" fungus was already 

 present on many of the leaves at the time of spraying, no 

 injury whatever resulted to the foliage or to the fruit. We 

 see, then, that under weather conditions which will cause 

 Bordeaux mixture to bring about the defoliation of one variety 

 of apple (Duchess' Favourite), the foliage of another variety 

 (Warner's King) will remain unaffected. 



(4) On June 8th 25 trees of Worcester Pearmain and 25 

 trees of King of the Pippins (growing in a plantation at 

 Selling) were thoroughly sprayed in hot, sunny weather with 

 the lime-sulphur wash at "full strength." After about ten 



* See this Journal for January, 1910. 



