1911.1 PUBLIC DOCUMENT — No. '61. IGl 



PEACH AND PLUM TKOUBLES. 



BY KAYMONL) DblAN WHITMARSH, B.S. 



^lany diseases uf the plum and peach have been known and 

 described for years. Standing probal)ly first among the most 

 serious of the fungi are '' l)rown or fruit rot," or Monilia (Scle- 

 rotliiia frucligena (Pers. ) Sehroet.), and scab {(Jladosporiu7tL 

 carpopliylhim, Thilmen). These fungous troubles have been 

 Aery noticeabk^ in the peach and j)lum orchards at the college 

 during the past year or two. 



The writer began investigations early in January, 1909, 

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

 peach, 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 lieen 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. 



Beown Rot ok Fruit Ivot, ]\[onilia (Sclerutinla frucUgena 

 (Pers.) Schroet.). 

 Distrihiifioii ojid Hod Plants. — This disease is reported by 

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

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

 known as Monilia frucUgena, one of the " imperfect 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 by Dr. C. H. Peck in 1881 ; since that time 



