1G(3 EXPERIMENT STATION. [Jan. 



mistakes in fertilizing, since no fungi are associated with it; 

 and the only difference between the cultivation of this partic- 

 ular croj^ in which the trouble occurred and other surrounding 

 ones, some of which had been planted from the same seed beds, 

 consisted in the methods of fertilizing. 



MoNiLiA ox Peach Stem. 



Eor a number of years we have received peach twigs in this 

 department which have been conspicuously spotted. The spots 

 appear on one-year-old wood, and are of an ash or greyish 

 color in the center, with a more highly colored, generally 

 purple margin. Examination of these spots has invariably 

 revealed the presence of a sjiecies of Monilia which extends 

 scarcely below the epidermis. Occasionally the spores of 

 Cladosporium are to be found, but by no means frequently. 

 Some years the spotting appears to be much more common 

 than others, and there is generally little difficulty in finding 

 it in orchards during such periods. Cultures from the spots 

 have always produced Monilia. Mr. F. A, Bartlett, now of 

 Hampton Institute, Hampton, Va., and formerly a senior in 

 our laboratory, during the year 1905 made many isolations 

 and cultures of this fungus. lie was not able to complete his 

 studies of the fungus, but from his observations it would 

 appear that a species of Monilia was the sole cause of this 

 spotting. ]\lr. Bartlett thus verified observations which had 

 been previously made by my former assistant, Prof. R. E. 

 Smith, and myself. From Mr. Bartlett's various cultures it 

 would api^ear that the spores of Monilia causing this spotting 

 to peach twigs are not the same as those occurring on the fruit 

 (Oidium fnictigenurn)^ but is a different species, possessing 

 smaller spores, and otherwise differing from the species attack- 

 ing the fruit of the j)each, etc. 



There are various Monilia and Cladosporium troubles 

 which affect the peach described in experiment station publi- 

 cations and foreign pathological journals, all of which appear 

 to differ from this one in its effect upon twigs. 



We hope to make further investigations of this trouble, and 

 in the meanwhile it may be mentioned that where the lime 



1 Oidium frnc.tigennm, Kze. & Schm. 



