1911.1 rUBLlC DOCUMENT — No. oi. IGi 



PEACH AND PLUM TROUBLES. 



L!V lIAVilOND DKAN WHITMAh'.SJI, K.S. 



]\rany diseases of the pliiin and peach have Leon known and 

 (iescribed for years. Standing probably first among the most 

 serious of the fungi are " brown or fruit rot," or Monilia {Scle- 

 rotinla fructigena (Pers.) Schroet.), and scab (Cladosporiuvi 

 carpopTiyllum, Thiimen). These fungous troubles have been 

 very noticeable in the peach and plum orchards at the college 

 during the past year or two. 



The writer began investigations early in January, 1900, 

 mainly to determine the cause of so much gum flow on the 

 l)each, almost every tree being affected to a greater or less ex- 

 tent. In connection with this study nearly every phase of the 

 above diseases as they are described by various writers was 

 noted, and a brief resume of their characteristics and methods 

 of treatment is given here, with observations on '' gummosis " 

 of the peach. 



This paper has been prepared under the supervision of Dr. 

 G. E. Stone of the Massachusetts Agricultural College, and to 

 him I wish to express my heartiest thanks for his many sugges- 

 tions, criticism of manuscript and verification of observations. 



Browx Eot or Fruit TtOT, ^Ioxilia {Sclerotinia frucUgena 

 (Pers.) Schroet.). 

 Distrihufion and Host Plants. — This disease is reported In- 

 Saccardo as being found in Germany, France, Austria, Italy. 

 Belgium, Great Britain and the Ignited States, where it is 

 known as Monilia fructigena, one of the " imj^erfect fungi." 

 Tubeuf and Smith speak of the disease as being very common 

 in the United States and Great Britain. It was first described 

 in the United States bv Dr. C. H. Peck in 1S81 ; since that time 



