ORCHARD SPRAYING EXPERIMENTS. d'J 



year widespread throughout the countr}^, as shown by reports 

 of injury to sprayed and unsprayed fruit. 



We cannot, however, concur with the view taken by some 

 workers in this field, who, on the basis of their results, do not 

 credit lime-sulphur sprays with ability to produce fruit injury. 

 We incline to the belief that positive results such as ours are 

 more significant than those of a negative nature. The fact that 

 spraying trees with lime-sulphur has resulted in no injury to 

 fruit may mean no more than the absence of conditions neces- 

 sary for producing it with the spray in question, or that in some 

 cases it has been used on varieties not especially susceptible to 

 spray injury. 



A comparison of the injured apples from the check plots (Fig. 

 55) and those from the lime-sulphur plots (Fig. 51) brings out 

 the point at issue. The unsprayed fruit shows a good amount 

 of russeting and remarkable deformity. But laying the fact of 

 deformity aside, we do not find on the unsprayed plots the very 

 evident pustulation or "pimpling" of the russeted surfaces so 

 clearly evident on fruit from the lime-sulphur plots. This, be 

 it noted (Fig. 51), is practically identical in appearance with a 

 moderately severe case of bordeaux injury. 



Injury from lime-sulphur has moreover been reported in other 

 states. Parrott and Schoene* recognize the russeting of apples 

 sprayed this season with lime-sulphur. Two of the coopera- 

 tive experimenters report severe russeting, although less severe 

 than where bordeaux was used. Others report such injury to 

 lesser degrees, and in general always less than the damage 

 caused by bordeaux mixture. 



Prof. Cordley reports fruit injury of a nature similar to our 

 experience. In experiments conducted by him in the Willa- 

 mette Valley no injury could be obtained on fruit "without 

 using the spray at a strength sufficient to seriously injure the 

 foliage. * * * In the Hood River Valley, where we con- 

 ducted certain experiments, entirely different results were ob- 

 tained. No injury whatever to the fruit was produced by the 

 application, which was made at the time the blossom buds were 

 opening, nor by the second application which was made after 

 the petals fell ; but serious injury to the foliage and fruit did 



* Parrott, P. J. and Schoene, W. J. loc. cit. 



