650 Report oF THE HORTICULTURIST OF THE 
the scab in pear orchards and at what time in the season ought 
the treatment to be made? 
2. To what extent is late spraying liable to cause russeting or 
roughness of the fruit? 
3. To what extent will the benefits of spraying one season 
influence the crop of the next season ? 
It should be noted that this discussion of the treatment of pear 
scab applies simply to orchards. The methods of treatment 
which have proved successful in orchards are not wholly appli- 
cable to the treatment of pear seedlings or pear nursery stock. 
INVESTIGATIONS OF 1893. 
The experiments of 1894 were a continuation of similar work 
by the Horticulturist in 1893, and the questions above proposed 
for investigation suggested themselves in considering the results 
of that work.” | 
Two questions were selected for investigation in 1893. The 
first was whether the pear scab could be practically prevented by 
_ the use of Bordeaux mixture diluted to the 1 to 11 formula?” 
The second was whether three treatments before the blossoms 
open are preferable to two treatments before the blossoms open. 
As a result of these investigations it was demonstrated that this 
dilute Bordeaux mixture, when thoroughly applied, is a practical 
preventive of pear scab. But little difference was observed in the 
per cent. of first-class fruit obtained from the sections sprayed 
three times before blossoming and that obtained from the sections 
sprayed twice before blossoming, so that 1t was considered doubt- 
ful whether enough benefit was derived from the extra treatment 
to justify its expense. Three treatments were made after blos- 
soming, making the total number of treatments for the season six 
in one set of experiments and five in the other. When it was 
shown that this treatment was effectual in preventing the scab 
the question then arose whether or not this was the least number 
of applications of Bordeaux mixture of this strength necessary to 
do the work satisfactorily. ; 
10 The results of the experiments of 1893 were published in Bulletin 64 of this Station and also 
in the Annual Report for 1893, pp. 694 to 717. 
11 See note, page 649. 
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