263 



The treatments were begun in 1801 about three weeks after planting, when the 

 first leaves were nearly three-fourths grown. The dates upon which the applications 

 were made were May 21, June 3, June 24, July 9, July 24, August 8, and August 28. 

 As indicated above in the plan, half of each section was treated three times. Those 

 treated three times were sprayed on the first three dates mentioned. 



In 1892 the treatments were begun on May 26, when the leaves had attained full 

 size, and the first appearance of the disease was observed. The dates of treatment 

 are May 26-27, June 15-16, June 23, July 6-7, July 21, and August 5. In order to 

 apply the mixture more thoroughly the spray was passed rapidly over the plants 

 and, the operation repeated after the first spraying had dried.* This method insured 

 as near a complete coating of the fungicide as possible, and it was found that- the 

 Bordeaux mixture of this weak strength adhered with remarkable tenacity, being 

 plainly visible twelve weeks after application. t Care was taken to spray the under 

 side of the leaves on the cherry and plum stocks, but pear, quince, and apple 

 stocks were sprayed from above. 



The treatments *bf 1892 were not continued so late in the season as those of 1891, 

 and the different sections received respectively five and six sprayings, instead of three 

 and six as in 1891. Those receiving five sprayings were treated on the first five dates 

 mentioned above. The actual amount of the fungicides used will^be of little value in 

 estimating the quantities that will be necessary in treatments on a large scale, but 

 for the convenience of other experimenters it may be roughly estimated to equal 3 

 to 4| gallons of solution per 1,000 one-year-old stocks and proportionately more 

 for budded stocks. By one-year-old stocks is meant stocks previous to budding. 



The spraying was done with a W. & B. Douglass " Perfection" knapsack sprayer, 

 which proved moderately satisfactory, although a hand-wheel machine would un- 

 doubtedly have been better. 



DESCRIPTION OF PLATES.* 



PLATE XXI. French pear stocks, planted in 1891 and treated 7 times with Bor- 

 deaux mixture, full strength; left unbudded in the fall and 

 treated 6 times with Bordeaux, one-third strength, in 1892. 

 These could properly be called 3-year-old seedlings. Situation 

 of stocks, Row VIII, east end. 



XXII. French pear stocks, similar to those in Plate xxi, but without 

 treatment either in 1891 or 1892. Situation of stocks, Row VI, 

 east end. Showing defoliation caused by Entomosporium. 



XXIII. French pear stocks, similar to those in Plate xxi, but treated 7 



times in 1891 and 6 times in 1892 with ammoniacal solution. 

 . Situation of stocks, Row VIII, near center. 



XXIV. Angers quince stocks, planted as cuttings in 1891 and treated 7 



times with Bordeaux full strength the first season, left un- 

 budded in the fall, and treated 6 times with Bordeaux one-third 

 strength in 1892. These could properly be called 3-year-old 

 cuttings. Situation, Row V, near east end. 



XXV. Angers quince stocks, similar to those in Plate xxiv, but without 

 treatment either in 1891 or 1892. Situation, Row V, east end, 

 one rod east of those in Plate xxiv. Showing defoliation by 

 Entomosporium. 



* Suggested first by N. A. Cobb, Dialogue concerning the manner in which a poison- 

 ous sfmiy does its work in preventing or checking blight. ^Agricultural Gazette 

 N. S. Wales, Vol. n, pp. 779-786. 



t These double sprayings were made on the first, fourth, fifth, and sixth treatments 

 only. 



t All plates are reproduced from photographs taken 8 feet from the stocks on Sep- 

 tember 29 and October 11. 



