458 STATO] BOARD OF AGRICULTURE. 



For the late application no poison was used so the mixture contained: 

 85 per cent dusting sulphur, 15 per cent hydrated lime. 



The use of hydrated lime in dusting materials for use on peaches has been 

 generally recommended to prevent any possible injury by lead arsenate, but 

 its greatest value probably is in improving the physical condition of the 

 mixture so that it will spread evenly and cover more trees than a mixture 

 containing no hydrated lime. 



Applications. Two applications were made in this orchard. They were 

 made at the periods and with the material here indicated. 



1st. Just after last of "shucks" had dropped. The 75-15-10 mixture was 

 used. 



2nd. August 16. On Salway only. No lead arsenate was used. The 

 trees were dusted from two directions and the work was done early in the 

 morning when atmospheric conditions were favorable. 



Weather Conditions. The entire season, until September, was very dry 

 and unfavorable for the development of brown rot or peach scab; but after 

 September 1st there was considerable rainy and "muggy" weather which was 

 very favorable for the development of both diseases. 



RESULTS. 



Effect upon foliage and color of fruit. There was no indication of foliage 

 injury at any time. The color of the fruit on dusted trees of Salway was 

 apparently higher than on untreated trees. 



Controlof brown rot and peach scab. The results with Elberta were not 

 conclusive as no appreciable amount of rot or scab developed even on the 

 ciieck trees. The quality of the Elbertas was excellent on both dusted and 

 clieck trees. 



With the Salways, the difference between dusted and check trees was very 

 marked and the results of counts made when the fruit was picked is given in 

 an accompanj'ing table. The fruit from three representative dusted trees 

 and three representative check trees was sorted into lots of sound, scabby 

 and rotten fruit, and counts made of each lot. 



These figures show that sulphur dust gave almost complete control of 

 peach scab on Salways and favorable results in controlling brown rot while 

 the fruit was still on the trees. The effect of the dust upon the keeping or 

 holding quality of the fruit is discussed in the next paragraph. 



Control of brown rot after harvest. Average samples of fruit from both 

 dusted and check plots were taj5;en an4 held for several d^ys with the 

 results showij in table 10. 



