REPORT OF THE SOCIETY 43 



the sulphur principally that the solution depends for its fungicidal value. 

 Lead arsenate thus takes away one third of its value. Also on account*of 

 the fact that the agitation of the sludge is more difficult, more arsenate of 

 lead is lost, which should go on to the trees, but stays in the bottom of the 

 tank. 



Arsenate of lime is cheaper in its more convenient form, the powder, 

 than arsenate of lead, though the makers are, in my opinion, asking a pretty 

 high price for the arsenate of lime, which should be much cheaper than it is. 

 Coinparing both prices, I have had what one would call fair quotations of 

 both: arsenate of lead at 23 cents a pound and arsenate of lime at 18 cents 

 a pound, if bought by the carload lot. 



Arsenate of lead, when used alone, is a safe insecticide. We must admit 

 that this is not the case with arsenate of lime. It should never he used alone. 

 When used in combination with sulphur washes it is safer than arsenate of 

 lead especially for the sprayings following the calyx spray, when the small 

 apples are formed. Arsenate of lead zvhen used alone is by far the safest 

 insecticide. 



The second point which I wish to discuss with you is this: Is there any 

 advantage in using Bordeaux mixture to prevent the falling off of apples 

 which some claim is due to lime sulphur injury? 



The conditions may not apply to our province, but let me state that 

 in Nova Scotia there has been this season some complaint that the apples 

 were dropping too much in orchards sprayed with the lime sulphur solution, 

 while in the others sprayed with Bordeaux mixture there was considerably 

 less dropping. 



To investigate the matter fully Mr. Sanders tried out both Bordeaux 

 mixture and lime sulphur to find out at what period the lime and sulphur 

 did the most burning and caused the most dropping of the apples, and also 

 to find out if there was a period at which Bordeaux mixture did less damage 

 than the lime and sulphur. The following are the results: 



L.S. 1.009 s.g. B.M. 4-4-40 



lead arsenate Dry acid \ead 

 1 lb. to 40 gallons. arsenate 



Immediately before the blossoms, 1 1 lb. to 40 gallons. 



spray only 159 327 



Immediately after the blossoms, 1 



spray only 108 204 



Two weeks after the blossoms, 1 



spray only 30 231 



Unsprayed trees averaged 277 apples per pair. 



