624 



Bulletin 8o. 



but I am inclined to think that this woolly covering — which is a 

 living growth from the surface of the fruit — was killed by the 

 Bordeaux mixture. The young fruits, it will be remembered, 

 were much discolored by the Bordeaux, but the absence of any 

 roughness or discoloration upon the ripe fruit apparently shows 



that the injury did not extend 

 deeper than the fuzz. These 

 sprayed fruits were not only 

 larger, yellower and smoother 

 than the others, but they were 

 almost wholly free from spots 

 or cracks of the spot fungus, 

 although none of the fruits 

 in the orchard were seriously 

 attacked. Another marked 

 result of these two sprayings 

 was the complete destruction 

 of the "moss" which had 

 o\ergrown many of the trees. 

 Fig. 9 shows on the left a 

 branch from a sprayed tree. 

 This was completely covered 

 with the moss when the ex- 

 periment began, but this moss 

 was killed by the sprays and 

 nearly all of it had fallen oflf 

 when the trees were examined 

 in September. The branch 

 upon the right shows the 

 moss upon the unsprayed 

 trees.* 



The results of these two tardy 

 spayings, then, were exceeding 

 ly satisfactory. In fact, the out- 



come was more marked than is 



*This " moss" is really a lichen. Two species are growing upon the right 

 hand branch. The most abundant light-colored one is Physcia stellaris ; 

 the dark patches are Theloschistes concolor. These were determined by 

 Miss Clara E. Cunimings, of Wellesley College. 



9. Sprayed liuib ( on the left ) ivith 

 ' ' moss ' ' or lichen destroyed ; un- 

 sprayed limb on the right. 



