890 



Spraying Experiments. 



[fee. 



gooseberry bushes of the "Yellow Rough" variety received 

 a fairly heavy application of the wash. After a few days 

 the injurious effect of the wash was very marked— the bushes 

 being nearly defoliated, all the leaves having dropped off 

 from the young shoots. 



(3) On June 21st several bushes of Whin ham's Industry, 

 growing in the College plantation, were sprayed with the 

 "full-strength" or with the "half-strength" lime-sulphur 

 wash. Some "scorching " occurred in both cases, and a con- 

 siderable number of leaves fell off. 



(4) On June 21st a plot of 39 gooseberry bushes of the 

 varieties Berry's Early, Whinham's Industry, and Lanca- 

 shire Lad (growing in the College plantation) were thoroughly 

 sp rayed with the lime-sulphur wash of two strengths — sp. 

 gr. 1 '005 and sp. gr. 1*003. The plot was divided into two 

 parts; one part contained 13 bushes, which were sprayed with 

 the wash of sp. gr. roo5 ; the other part contained 26 bushes, 

 which were sprayed with the wash of sp. gr. 1*003. Both 

 parts of the plot contained bushes of the three varieties. 

 The bushes of Lancashire Lad sprayed with the 1*005 wash, 

 as well as those sprayed with the 1*003 wash, were seriously 

 injured, and after a few days lost practically all their leaves ; 

 in neither part of the plot was any injury done to the Berry's 

 Early or to the Whinham's Industry. At the time of spray- 

 ing the American Gooseberry-mildew (in the summer stage) 

 was infesting the bushes and spreading rapidly ; the lime- 

 sulphur wash appeared efficacious in stopping the spread of 

 the mildew. 



Mr. H. J. Small, of Evesham, Worcestershire, following 

 instructions sent to him from Wye College, has experimented 

 with the lime-sulphur wash prepared in concentrated form 

 and diluted (using the hydrometer) to a specific gravity of 

 1 '01. Trees of Cox's Orange Pippin which were badly 

 affected with Apple-mildew (Podosphaera leucotricha) were 

 sprayed during May. Mr. Small reports that no "scorching" 

 of the foliage occurred, and that the wash seemed to have a 

 beneficial effect in checking the spread of the mildew by 

 preserving the healthy foliage from becoming infected.* In 

 this instance — where no "scorching" occurred — rain fell 



* Hop leaves are similarly protected by the same wash from attacks of the hop 

 mildew or " mould " (see this Journal for June, 1910, p. 184). 



