70 MAINE AGRICUIvTURAIv EXPERIMENT STATION. I91I. 



sue at the end of the apple had dried and separated from the 

 normal portion and fallen aw9,y, leaving the seeds exposed at the 

 bottom of circular cup-like depressions. Some apples less seri- 

 ously burned showed deeply depressed calyx basins."* Nearly 

 one-fourth of the picked fruit from these trees treated with 

 Paris green were reduced from first class, and many to cull 

 grade from this cause. Trees treated with arsenate of lead de- 

 veloped one per cent of apples blackened at the blossom end. 

 Rainy weather was held accountable for the intensity of the 

 damage inflicted. 



Paddock** also reports an attempt to control an alternaria rot 

 on apples described by Longyear,*** which affected the fruit 

 at the calyx end. Paddock concluded that much of said alter- 

 naria injury was really due to spraying with improperly pre- 

 pared arsenicals, and emphasizes the necessity when using ar- 

 senite of lime on Ben Davis and Gano of spraying during fair 

 weather only. 



Scott and Quaintancef noted injury to leaves, and fruit of 

 the peach produced by lead arsenate in their 1908 experiments. 

 Mr. J. P. Stewart of the Pennsylvania Station has observed a 

 similar burning of peaches following the use of bordeaux and 

 lead arsenate. 



Cordley has indicated the differences in chemical reaction be- 

 tween lime-sulphur and the two kinds of lead arsenates, netural 

 and acid, showing that the amount of soluble arsenic in mixtures 

 of the fungicide with the acid arsenate is 4 to 7 times greater 

 than when the neutral kind is used.:!: 



-These facts are significant in view of the aforementioned in- 

 juries of this season. It is unreasonable to ascribe to a com- 

 mon cause injuries so much alike as the russeting from lime- 



* Taylor, E. P. "Spraying Apples for Curculio and Codling Moth". 

 Missouri State Fruit Sta. Bull. 21 (1909). p. 69. 



** Paddock, W. Rept. of Field Horticulturist. Colo. Agric. Expt. Sta. 

 Press Bull. 43 (1907). 



*** Longyear, B. O. "A New Apple Rot". Colo. Agric. Expt. Sta. 

 Bull. 105 (1905). 



t Scott, W. M. and Quaintance, A. L. "Control of the Brown-Rot 

 and Plum Curculio on Peaches." U. S. D. A. Bureau of Ent. Circ. 120 

 (1910). 



t Cordley, A. B. "The Linie-Sulphur-Arsenate of Lead Mixture." 

 Better Fruit, May, 1910, pp. 37-41. 



