ORCHARD SPRAVIXG EXPERTMKNTS IN Ujl2. &■} 



warrant its use in commercial spraying. However this is a 

 matter which requires more confirmatory evidence. 



The "one-fourth weaker" dilution on plot D proved to be 

 entirely inefficient in scab control and doubtless what gains there 

 were did not pay the cost of spraying.' While it is very likely 

 that much better results would have been obtained if another 

 application of this spray had been made earlier it is not felt that 

 the results are sufficiently encouraging to warrant following it 

 farther another year. 



Lime-sulplnir vs. bordeaux mixture. The percentage of per- 

 fect apples obtained from the plot sprayed with bordeaux mix- 

 ture exceeded that produced on those plots sprayed with lime- 

 sulphur the same number of times with the exception of plot B 

 where the strongest lime-sulphur spray was used. Here again, 

 however, the figures do not tell the whole story. Strange as it 

 may seem, practically all of the scabbed apples on the bordeaux 

 sprayed plot were also among the russeted. However, very 

 few of the apples on this plot were very badly affected with 

 scab. On the other hand the scabbed apples on the lime-sulphur 

 sprayed plots were, as a rule, somewhat more seriously affected. 

 While the slightly scabbed apples on the bordeaux plot would 

 doubtless keep in storage better than the slightly more severely 

 attacked fruit on the lime sulphur plots the latter fruit on ac- 

 count of its freedom from spray injury or russeting would 

 bring a higher market price. 



Arsenate of lead as a fimgicide. Another very striking fact 

 in connection with results obtained was the apparent effective- 

 ness of heavy applications of arsenate of lead in the control of 

 apple scab as is shown by a comparison of the per cent of scabby 

 apples recorded from plots A and E. In one case where 4 

 pounds of arsenate of lead to 50 gallons of water was used with 

 no other material added as a fungicide only a little over 25 per 

 cent of the fruit was scabbed while in the other case where only 

 half as much arsenate of lead was applied over 80 per cent of 

 the apples were scabby. Moreover it will be seen on reference 

 to the table that where the 4 pounds of arsenate of lead was used 

 alone the percentage of perfect apples obtained was greater than 

 on all other plots wdiich received the same number of applica- 

 tions except B, where the stronger dilution of lime-sulphur was 

 used. 



