V.\MM11— A ( in KU\ 1)1S1..\S1-.. \);, 



The '^ INiwdcrv Mildew,"" l^iDlosjiJiura oxijai-a iil}m\ has hccii 

 \ ('r\- (lest i-iict i\ (■ to in.iiiv ol' tin- sccdliiius and the l('a\('s()l' 

 ihc yoiiiii;- IcDiiiiial -hoots nl' nearly every variety <»f <-idti- 

 \ated cherry on ihe i^ioiind siili'ered liadly. lint iar more 

 troublesome than t!ie '• I'owdeiy Mildew,"* is the " imperfect 

 I'lin^ns,"* ('ijluiihn,-<] (II /iiHi I <i(h' Karst. I/dxc the pear dis- 

 ease the leaves lal! preniat iirely, which must very materially 

 lessiMi t!ie amoimt of starch stored away for fntnre growth 

 :ui 1 ({■■velopmeul au;l a diminis'ied crop of i'mil may Ir,' e\- 

 pe: ted. I cannot here liive a list of the nnmei'ous varieties 

 which sulVer froin it and those which do not. It will he snf- 

 li •lent to state that a larj^c numher of varieties on the i:-)-onnd> 

 lost theii- tolia,£ri' l>v the middh' of Anirnst, while others lost 

 oidy a small proportion. Scarcely a variety is wholly exempt. 

 The mahalel) had tlie hest foliaoc, hein^- attacked only to a 

 slight deiii'ee and nsmdiy only on th(> lower lea\-es hy this 

 funiiais, while it was entirely free fr<tni Po'lospha-ra oj-i/a- 

 iuuitluv. The disease is very wide s[)iead in this country, 

 while in Europe it ajjjx'ars to cau.so little trouble judirinL'^ 

 from the meaiicr account found in European works. I'rof. 

 Hudd informs me he has iieen familiar with it for many years 

 and has noticed it especially trouhlesouie on the Early Rich- 

 mond, Mr. r.each found it on ihe mahalel) at Atlantic, while 

 -Mr. J. S. Harris reports it from La ("rescout, Minn. Mr. 

 Ellis' has di>tri!uited it from New Jersey. Prof. Arthur^ 

 foimd it very trouhlesome in New York and in his report has 

 iriven quite a full account of it. Kellerman'' has distrihnted it 

 from Kentucky. Mr. T. T. Eyon" finds it occurs on the follow- 

 ing host.s : Pruntts (hnncstica, P. padiift, P. cfva.sus, P. amevi- 

 cana, P. avmoniaca, P. pn-sica, P. serod'na. At Anie.s it 

 has heen found most commoidy on the eultivated cherry. .Mr. 

 Morris, a special stucUuit at the lal)oratory, found it on the 



4 — Xonli American Fungi, Series II, Cent. XXIll. No. 2>8i. 



5— New Vork .Aurituluiral hxperimcnt Scation, i836, p. 293. and 1887, pp 547, 3i" 



i> — North American Fungi, No. 1151. 



7— Michi;,'an MortlcuUiir .st. VoK 1, i836, p. 134. 



