i 
__ “EXPLANATION OF PLATES. 
PLate I. Black rot of grape. Shows the result of treatments with Bordeaux mixture 
full strength, applied early. Figs. 1 and 3 clusters from treated plats from 
which rotten berries were removed. Figs. 2 and 4 clusters from adjacent un- 
treated plats with rotten berries removed. Collected July 10. Redrawn from 
photographs. : 
PuaTe II. Black rot of grape. Shows the result of treatments with Bordeaux mix- 
ture, half strength, applied early. Figs. 5 and 7 treated; 6 and 8 untreated. 
Prepared same as Plate I. ; 
PLaTE III. Apple scab. Shows graphically in percentages the result of experiments 
at Madison, Wis., in the treatment of the disease. The fruit when harvested 
was graded into Ist, 2d and 3d qualities. The averages from two trees are repre- 
sented by white for Ist quality, lines for second quality, and black for 3d quality. 
Figs. 1, 2, 3,4, and 5 explain themselves. Fig. 6 is made up from the same data 
as 1,2,3, and 4, but represents averages of eight treated trees instead of two. 
Pirate IV. Pear leaf-blight. Shows condition of treated and untreated stock 
August 24, at Mullikin, Md., as regards leaf-blight. Figs. land II represent 
Japan stock, III, IV, V and VI French stock. Each perpendicular line repre- 
sents a single stock, and the horizontal line to which it reaches indicates its 
condition as regards leaf-blight. Thus, for instance,the first stock in Row I was 
graded as 4th quality, the second as 3d, and soon. The treatment which each 
stock received is printed below the section in which it is contained. Sections 
are separated by a short line extending below the base line. Grading of stock 
done by Messrs. Dorsett, Swingle and Fairchild. 
Prate V. Pear and cherry leaf-blight. Shows condition of treated and untreated 
stock in the experimental block at Geneva, N. Y., as regards leaf-blight, Sep- 
tember 21. Composition of Plate is the same as that of Platerv. Grading of 
stock by Fairchild. 
Pirate VI. Plum leaf-blight in nursery rows. Shows result of treatment with weak 
Bordeaux mixture, Geneva, N. Y., from photographs taken September 19, 1892. 
Representive sections from treated and untreated rows. 
PLATE VII. The percentage of fruit free from spot is shown by the black portion of 
the bars; that slightly spotted or of second quality, by lines slanting to the 
left; and that badly spotted, as black. Each -); of an inch represents 1 per cent 
of fruit. The last bar of each series represents the percentages derived from 
the average of eighteen untreated trees. 
PLATE VIII. Shows the actual number of fruits borne on each tree in the experi- 
ment and the condition of such fruit as regards spot. The classification, as 
regards condition, isthe same asin Plate vil. Each ; of an inch in length repre- 
sents a single fruit. 
