SPRAYING EXPERIMENTS IN 1894 



BY H. H. LAMSON 



The experiments recorded in tliis bulletin are a continuation 

 of similar ones carried on in 1892 and '93, directed chiefly to 

 the treatment of the fungous diseases of the apple, pear, and 

 potato. 



Numerous varieties of apples aud pears are affected with the 

 disease known as the scab, which is caused by the growth of a 

 minute parasitic or fungous plant. Frequently very serious 

 injury is done, both to the foliage and fruit, aud some varieties 

 are almost a complete failure on account of it. The scab 

 grows on the surface of the leaves and fruit. On the leaves 

 it grows in dark green or smoky spots and patches, frequently 

 causing them to become much wrinkled ; on the fruit the scab 

 produces characteristic dark green or black spots, rounded in 

 outline with sharply defined margins. When attacked early, 

 the fruit is liable to be one-sided, and in many cases it is badly 

 cracked. 



PEARS 



About two-thirds of a Flemish Beauty pear tree was sprayed 

 and the other third left unsprayed. The spraying was done 

 on April 30, May 22, June 1.5 and 30. 1 to 12 Bordeaux mix- 

 ture (1 pound blue vitriol to 12 gallons of water; see under 

 heading Bordeaux mixture) was used. The pears, when gath- 

 ered, showed the following result : 



An increase of 47 per cent, apparently due to spraying. 



