208 Report of the Botanist of the 



leaf curl. 

 (Exoascus deformans (Berk.) Fcld.) 



Leaf curl has given very little trouble. Over the greater part 

 of the district it is reported as occurring only to a slight extent. 

 Correspondents at Stockport, Columbia Co., and Annandale, 

 Ulster Co., report it severe ; but it is possible that in these cases 

 the fungous leaf curl may have been confused with the work of 

 plant lice.^° 



It appears that the weather conditions in early spring exert a 

 a marked influence ujDon leaf curl. In 1898 it was very destruc- 

 tive. 



YELLOWS. 



This disease is common throughout the Hudson Valley and in 

 some localities very destructive. From year to year it fluctuates 

 somewhat in virulence, but may be depended upon to appear to a 

 considerable extent every season. It is one of the most trouble- 

 some peach diseases in this section. 



FRUIT ROT. 



(Monilia fructigena P.) 



Usually this disease is common, but in 1899 it was scarce 

 because there was little fruit to rot. It has been reported from 

 Tarrytown, Milton, Client^ Middle Hope and Washingtonville. 



LEAF TIP-BURN. 



In a small orchard of young trees at Monsey, Rockland Co.^ 

 a leaf trouble was observed which may be called tip-burn. The 

 tips and margins of the leaves on the new wood appeared water- 

 soaked^^ and transparent. Upon drying, the diseased portions 

 became yellowish white. The trees were of the variety Red Cheek 



29 Some fluit growers know the Exoascus disease by the name " red blister,"' 

 and the work of aphides by the name " leaf curl." This tends to confusion. 



30 The water-soaked condition may not be a character of the disease, but 

 due to a rain Avhich occurred a short time before the observations were made 



