l88 MAINE AGRICULTURAL EXPERIMENT STATION, I916. 



by scattered trees on high, well-drained soil, and was not found 

 elsewhere under similar conditions. 



Dried specimens showing the more common characteristics 

 of the affected leaves were sent to three recognized experts in 

 plant pathology in other states, asking if they had previously 

 seen the trouble and if they could give any information as to 

 its cause. 



Dr. G. P. Clinton of Connecticut replied as follows : "On 

 page 360 of my 1914 report on chlorosis of plants, I mentioned 

 a chlorosis trouble of apples that I have occasionally seen. This 

 trouble is not quite like the one sent in that I have only rarely 

 seen it attacking the leaves of small branches, and the chlorosis 

 areas on the leaves are more elongated and whiter than those 

 you sent." 



Had Doctor Clinton seen the two leaves shown at the left of 

 Figure 27 it is possible that he might have wished to qualify 

 this statement. However, the writer is convinced that he is 

 correct in this opinion that the trouble found in Maine is dis- 

 tinct from the one observed by him in Connecticut. 



Prof. F. C. Stewart of New York made these comments : "In 

 our bulletin 328, page 318 you wil find a brief account of the 

 apple mosaic or variegation which you mention. From your 

 description and the specimen sent I am confident that the two 

 ar identical. I kno nothing about the cause of the trouble and 

 hav made no other observations on the effect of spraying 

 such leaves." 



In the publication mentioned* Professor Stewart records 

 under the heading of "Variegated Foliage" the occurrence of 

 this trouble on apple trees in four different parts of the state 

 of New York at various times from 1896 to 1910. In the 

 earliest observed case one tree had practically all the foliage 

 affected for two successive seasons. An adjacent tree which 

 showed the variegation the first year on one of its branches 

 was entirely free from it the second. One apple tree is men- 

 tioned on which certain branches show variegated leaves year 

 after year. 



The third lot of diseased leaves was sent to Dr. L. R. Jones 

 of Wisconsin. The reply came from Dr. G. W. Keitt who 



♦Stewart, F. C. Notes on New York Plant Diseases I. Bui. N. Y. 

 Agr. Exp. Sta. 328:318, 1910. 



