56 PEACH YELLOWS. 



IX. Year 1889. This plate represents a row of peach trees on the Depart- 

 ment grounds. Figs. 1 and 12 are healthy seedling trees, grown from 

 pits, which germinated in the spring of 1888. All the rest are trees 1 

 year older, but very badly dwarfed and diseased by yellows. Time, 26 

 months from date of inoculation. These are the ten trees mentioned 

 in the text, and some of them are the ones which furnished the pho- 

 tographs for Plate VIII. They were carefully transplanted in the 

 autumn of 1888 and suffered no injury. Nos. 2, 3, 7, 10, and 11 were 

 already dead at the time this photograph was made. The difference 

 in size is attributable to the dwarfing effects of the disease produced 

 by the inserted buds. The diseased growths in 4, 6, and 9 are prin- 

 cipally from the inserted buds; those in 5 and 8 are almost altogether' 

 from the seedling stock. Photo. October 21, 1889. 



X. Two trees from same row as Plate IX but enlarged to show certain de- 

 tails of the disease. These are Nos. 8 and 9. Much of the foliage is from 

 winter buds, which unfolded in summer and autumn. 



XI. Year 1890. Contrast of diseased and healthy trees. Same as Plate IX, but 

 13 months later, i. e., 3 years and 3 mouths from inoculation ; 1 and 

 12 are still entirely healthy. They have continued to grow, and have 

 shed their foliage for winter. Nos. 4, 5, 6, and 9 are all that remain 

 of the 10 trees moved and also all that remain of the entire 202 inocu- 

 lated trees ; No. 4 is dead, and 5, 6, and 9 are badly diseased in all 

 parts. All the foliage is from winter buds which developed in autumn, 

 Photographed November 21, 1890. These three trees have proved very 

 resistent and are all alive (August 16, 1891), i. e,, 4 full years from 

 date of inoculation. 



XII. Part of same row as Plate XI, showing three of the inoculated and dis- 

 eased trees more in detail (Nos. 4, 5 and 6), also a few branches of 

 No. I. Photo. November 21, 1890. 



INOCULATION EXPERIMENT NO. 2. 



XIII. Year 1889. Two figures showing seedling trees completely diseased ; x 



indicates the location of the inserted buds which are now dead. Trees, 

 27 months old. Diseased buds inserted August 3, 1887, i. e., 23 mouths 

 prior to date of photograph. Photos. July 1, 1889, Hubbardston, Mich. 



XIV. Year 1889. Same series as XIII. In Fig. 1 the inserted bud was on the op- 



posite side of the camera and was dead. In Fig. 2, x grew from the 

 inserted bud in 1888 but died in 1889. Both trees bore yellowish foliage 

 and were diseased in all parts. The living shoots on the trunks are 

 not from inserted buds. Photos. July 1, 1889, Hubbardston, Mich. 

 XV. Year 1889. Same series as XIII and XIV. All parts of both trees dis- 

 eased. In Fig. 1 the healthy-looking part of the tree is the shoot which 

 grew from the inserted bud. In Fig. 2 the inserted bud was dead. Time, 

 23 months from date of inoculation. Photos. July 1, 1889, Hubbardston, 

 Mich. The trees represented on these three plates were grown by 

 Thos. J. Shallcross, Locust Grove, Md., in 1887. They were budded 

 August 3, 1887 ; were moved in the spring of 1888 to Michigan, and 

 set at Hubbardston on April 24 of that year. They showed no symp- 

 toms of disease until after July, 1888. 



XVI, XVII. Year 1889. Healthy unbudded trees for comparison with those shown 

 on Plates XIII to XV. Trees of same age, i. e., 27 months, from same 

 nursery, removed at same time, and set in same field. Reduction the 

 same. Photos. July 1, 1889, Hubbardston, Mich. 



