184 Mortier F. Barrus 



year in favor of the unsprayed, and in both cases being well within the 

 range of experimental error. The company has since discontinued spraying 

 beans. 



During the eight years since 1908 a few rows of beans have been 

 thoroughly sprayed with bordeaux, and a few with lime-sulfur, a 

 hand machine being used. From four to six thorough applications were 

 made throughout the season, beginning soon after the plants appeared 

 and continuing until the pods were about two-thirds grown. The first year 

 neither anthracnose nor blight appeared to any appreciable extent, even 

 on the check rows. In 1909 no anthracnose was present, but the blight 

 appeared to be controlled somewhat by the application of the spray. 

 With one variety, Refugee Green Pod, there was no blight on the sprayed 

 rows while in the unsprayed rows 3 per cent of the pods were spotted 

 with blight. On the Red Marrows that were sprayed 2 per cent of the 

 pods were spotted with blight, while the unsprayed rows had 11 per cent 

 of spotted pods. 



In 1910 both anthracnose and blight were again negligible. In 1911, 

 one-third of each of six rows was planted on June 22 to seed of several 

 varieties mixed together, all badly spotted with anthracnose. Mixed 

 varieties were used because it was not possible to obtain a sufficient 

 quantity of affected seed of one variety. The remaining two-thirds of 

 the six rows were planted at the same time to seed selected from clean 

 pods, three rows to Red Marrow and three to Navy Pea. The first and 

 fourth rows were sprayed with bordeaux, the second and fifth rows were 

 not sprayed, and the third and sixth rows were sprayed with lime-sulfur. 

 Powdered arsenate of lead at the rate of 2 pounds to 50 gallons was added 

 to both the bordeaux and the lime-sulfur, in the hope of killing insects 

 that might be instrumental in carrying the blight organism. Five appli- 

 cations were made during the season, on June 13, July 1, 14, and 25, and 

 August 9. One-half of the plants in that part of the plot farthest from 

 the end planted to spotted seed were inoculated with a suspension of 

 spores of two strains of C olletotrichum lindemuthianum which had proved 

 virulent on the two varieties. This left one-half of the plants from clean 

 seed as a middle third of each row uninoculated with the fungus in any 

 way except with spores that might be carried to them. Two inoculations 

 were made, one on July 17 when one-half of the plants set aside for this 

 purpose were inoculated, and the other on August 22, when the remainder 



