PAPERS ON BIOLOGY AND AGRICULTURE 253 



Hoodville, Hamilton county. A crop reduction of 1 per 

 cent probably occurred. 



Leaf curl (Exoascus deformans (Berk.) Fckl.) was 

 slightly more abundant than usual and occurred through- 

 out the state. It is estimated to have had an injurious 

 effect equivalent to a 2.5 per cent crop reduction. 



Scab (Cladosporium carpophilum Thuein.) was re- 

 sponsible for a slight injury to the crop. Our first report 

 came from Jefferson county where it was found June 22. 



Pear: Black rot (Physalospora cydoniae Arn.) was 

 found only in Randolph and Jackson counties. The first 

 report came from DeSoto, August 19. 



Fire blight (Bacillus amylovorus (Burr.) Trev.) was 

 somewhat less severe than usual. A reduction of 5 per 

 cent in the yield of the state is estimated. 



Leaf blight (Fabraea maculata (Lev.) Atk.) was severe 

 locally but did not materially affect the crop. Our first 

 report came from near McLeansboro in Hamilton county 

 June 26. It was reported as far north as Morrison in 

 Whiteside county. 



Leaf spot (Mycosphaerella sentina (Fr.) Sehr.) was 

 not commonly found. The first report was from Coles 

 county, August 29. 



Scab (Venturia pyrina Aderh.) was found in Jackson, 

 Coles and Edgar counties. The earliest collection was 

 made near Makanda, July 19. 



Plum: Bacterial shot-hole (Pseudomonas pruni E. 

 F. S.) appeared throughout the state and resulted in a 

 slight crop reduction. 



Black knot (Plowrightia morbosa (Sehw.) Sacc.) ap- 

 pears to be common only in the eastern and southern part 

 of the state. 



Brown rot (Sclerotinia cinerea (Bon.) Schroet.) was 

 rather less severe than usual. It probably caused a crop 

 reduction of 5 per cent. 



Leaf blight (Coccomyces prunophorae Higg.) ap- 

 peared to be slightly more abundant than usual through- 

 out the state, although no appreciable damage can be 

 attributed to it. 



Leaf curl (Exoascus mirabilis atk.) was more abund- 

 ant than last year, especially southward. The continual 



