378 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



sprayings, and ■ Valentine's Seedling ' and ' Yellow Rough ' were badly 

 damaged even by the early sprayings. Our results confirm these and 

 were obtained in a very different season. Thus it appears unsafe to 

 spray many varieties of gooseberries with either lime-sulphur or liver 

 of sulphur, and neither spray proved effective in combating the disease 

 under the conditions of the work at Wisley, although both checked 

 it for a time. The defoliation is not only a source of loss of food- 

 making power in the plants but it also excites the lateral buds into 

 growth, thus further tending to weaken the bushes. Probably lime- 

 sulphur would protect bushes from infection where it can be safely 

 applied. 



It is a pleasant duty to acknowledge the assistance of the Wisley 

 students, especially of Messrs. J. O. Pritchard. C. C. Titchmarsh, 

 and A. N. Rawes, in carrying out the spraying and in making the 

 observations here recorded. 



The weather conditions during the spraying and after are set out 

 in Table IV. 



Table IV. — Weather Conditions at Wisley during Spraying 

 Operations, 1913. 



Date. 



Temperature. 



Hours 



of 

 Bright 

 Sun- 

 shine. 



Rainfall 

 in inches. 



Date. - 



Temperature, j 



Hours 



of 

 Bright 

 Sun- 

 shine. 



Rainfall 

 in inches. 



Max. 



Mill. 



Max. 



1 



Min. 



May 



7 



55-2 



34'9 



4*9 



•08 



June 25 



66-4 



48-9 i 



4-5 





* 



•8 



527 



46-8 





•II 



„ 26 



68 8 



49-9 j 



8*2 





* 



9 



5 6l 



477 



•2 



•OI 



n 27 



657 



507 



9-8 







10 



60-3 



46-1 



122 





„ 28 



76*2 



43'3 



9'5 







11 



62-2 



390 



7'5 



•OI 



» 29 



78-2 



521 



142 







12 



581 



43'2 





•05 



» 30 



73'o 



49 "o 



5 2 







13 



677 



51-0 



7-0 





July 1 



70*2 



49*3 



88 







14 



652 



42-0 



59 





» 2 



71-2 



530 



67 



12 





15 



59-1 



450 



69 





„ 3 



66-8 



55'4 



4-8 





>» 



16 



64-2 



43-o 



8-8 





4 



68-9 



510 



IX 



trace 



M 



17 



69-6 



38-2 



IX'I 





11 5 



65-6 



5*'9 



10 



•07 





18 



58-5 



41-1 



128 





,1 6 



62 0 



50-2 



10 



•07 





19 



57'2 



37-8 



io-i 



•05 



„ 7 



62-8 



4 8-6 



47 





>» 



20 



62-2 



39-5 



32 



trace 



8 



637 



42-9 



4-8 





>> 



21 



62-7 



46-8 



57 





9 



64-1 



460 



1-5 



•76 















,, 10 



633 



54° 





•03 



■fjune 12 



622 



48-9 



2'2 





M 11 



67*1 



49-8 



57 







13 



63-3 



502 



•6 





,, 12 



73'6 



503 



4-8 





>> 



M 



683 



53*4 



3-8 





H 13 



67-1 



523 



i-4 







15 



769 



52-4 



139 





n M 



72-6 



509 



j 2-4 



72 



>) 



16 



837 



450 



12-8 





„ 15 



611 



51-8 





•25 



») 



17 



82-4 



537 



9-5 





„ 16 



69-2 



537 



37 





>> 



18 



75-2 



49-8 



61 





17 



I 70-1 



52-0 



37 



•26 



>> 



19 



68-8 



539 



116 



trace 



„ 18 



1 68-t 



57*9 



11 



trace 



>> 



20 



64-3 



47-9 



14 



•34 



M 19 



62-1 



518 





•09 



>» 



21 



672 



45'9 



4*4 





,, 20 



66-9 



565 



I2'8 





>» 



22 



732 



46-2 



100 





1 „ 21 



633 



1 45H 



'3 



01 



>> 



23 



64-3 



50*7 



29 



•02 



22 



65'9 



54"9 



33 



trace 



>» 



24 



621 



496 



i'5 















* First spraying. 



t Second spraying spread over fortnight as fruit was picked. Done only on 

 dull days. 



