12 MAINE AGRICULTURAL EXPERIMENT STATION. igi2. 



The humidity records, owing to inaccuracies in the self- 

 recording hygrograph, are omitted. The precipitation and tem- 

 perature tables given above, when considered in relation to the 

 dates of spray application, will show that atmospheric humid- 

 ity may be considered a negligible factor. 



No dew formed in the night following the extremely hot 

 days above recorded, so no consideration of lens action of in- 

 tense light through drops of water need be included in a later 

 discussion of fruit injury. 



Re;sui,ts. 



Effect on Foliage. 



No injury whatever was noted on any of the trees in plots 

 A to E, inclusive. The foliage, despite the unusually hot sum- 

 mer, coupled with insufficient rain, was most thrifty in all 

 respects. Especially noticeable was the growth not only of the 

 foliage as a mass, but of the size of the individual leaves. 

 Evidently neither the strength of spray applied nor the existing 

 conditions at time of application affected the foliage of these 

 plots in any perceptible way. 



In this connection it may be said that three or four trees in 

 a row of about 20 Baldwins on the farm showed a moderate 

 amount of leaf scorch. These trees were sprayed with the 

 same solution and at the same strength as block C in the ex- 

 periment, — i. e. in dilution table proportions. The injury was 

 mostly marginal, scattered and in no way serious. The re- 

 mainder of this variety in this row showed no evidence of hav- 

 ing been affected. Considering that the Baldwin is regarded 

 as less susceptible to foliage spray injury than the Ben Davis 

 of the experimental plot, and that stronger applications did 

 not affect the foliage of the latter variety in any way, the injury 

 to the few Baldwins in question may be accounted for on the 

 ground of individual susceptibility. 



In plot F distinctly different results appeared. No spots 

 that could be reasonably ascribed to bordeaux injury were in 

 evidence up to the end of the second week in June. At that 

 time the characteristic circular dead areas began to become 

 noticeable * and increased very gradually throughout the sea- 



* See Fig. 47, Me. Agr. Exp. Sta. Bui. 189. 



