I.XSKCTS AM) DlSKASKS OK Till-: 



A large amount of defoliation occurred in the vicinity of Olcott, 

 Now York, during July of the season of P.M."). and in some sec- 

 tions of eastern .New York in August. At Olcott nearly a quarter 

 of the foliage was lost in several orchards. Ko spray had been 

 applied to the foliage, but unusual weather conditions prevailed 

 throughout the summer, causing heavy brown-rot infection of 

 fruit. From the symmetry of the spots and their location along 

 -the margins of the tip third of the leaves and along the midribs, it 

 seemed quite possible that the trouble was of fungous origin. No 

 preventive measures are known for the difficulty, but it is sel- 

 dom that the injury is so prevalent as it was during the season 



of n>i;>.* 



This disease (Sclerotinia frwt-igena) is the most serious fungous 

 disease of the peach. The fungus lives over winter in the rotted 

 peaches on the ground, produc- 

 ing little fruiting bodies very 

 curly in spring (Fig. 355), 

 while in peaches that still cling- 

 to the tree, spores are developed 

 (Fig. 354). The dissemination 

 of the spores may cause infec- 

 tion of the husk enveloping the 

 newly formed peach and the 

 poach also. Instances have been 

 noted in Niagara County, when 

 almost the entire set of peaches 

 has been destroyed by rot at this 

 time. In many cases the fun- 

 gus continues down the stem of 

 the peach 'into the branch, later 

 causing large black cankers so 



prevalent on Elberta in that . Mi-BBow^ ROT OF T,,K 



county. Again, the infection of 



fruit occurs during August, especially in the early varieties, such 

 as 'Champion, Carman, Triumph, or Dewey, and almost complete 

 loss results. For the most part susceptible varieties are not very 



* Bui. 328, 1010, N. Y. Agr. Exp. Sta. 



