MOMI.IA. t'. 1 '.' 



Washing of seems with a solution of hoii sulphate in spring 

 before the buds unfold is suggested, al-o -praying of yoiinu: 

 foliage with dilute Bordeaux mixture. 



Oidium. 



Mycelium epiphytic on living plants. ('onidia unicellular 

 and barrel-shaped, produced in chains on erect conidiophores. 



Many have already been proved to be conidial forms of 

 Erysipheae. 



Oidium erysiphoides Fr. fr-'ipients living leave- of hop, 

 clover, cucumher, etc., and is probably the conidia of <pecies 

 of Jfri/xiji/i'' on these hosts. (Britain and I'.S. America.) 



0. Tuckeri I'.erk. ( n leaves and berries of the vine 

 I '//</', iii/n, p. 176). 



0. leucogonium 1 >c-m. On roses: probably the conidial form 



0. farinosum Cooke. On living leaves of apple-ire. -. 

 < Britain, i 



0. chrysanthemi Uabh. On leaves of cultivated chry-an- 

 themum. ( Britain.) 



0. aceris Kabach. On leaves of Ac* / Pseudoplatanus. It is 

 probably the conidial stage of f r /u-i,infn bicornis. (Britain.) 



0. mespilinum Tluim. On leaves of medlar. (Britain.) 



0. destruens 1'eck. On Aui'lunrl/i,,- canadensis and /'///////> 

 serotina in America. 



0. tabaci Thum. ( )n leaves of tobacco. 



0. monilioides Link, probably the conidial sta-e of AY//s/y</,, 

 'I r<i n< un*, occur- on living grasses over t he \\liole world (see p. I 7" 1 1. 



i. S'lh-.-i,;-/. Macronemeae, 



Botrytis. 



Mycelium grey. ('onidia more or less spherical, and pro- 

 duced in . ttiona on the ends of branched conidioplmic-. 



Many of the species are aaprophytes, other- are para-nic ,,\\ 



plant- 01 insects, and other- torm sderotia: the latter ha\.- 

 already been enn-idered under >^i-/, i-i'fiiii'i (866 p. 267) The 

 tollowiii'_ r are known to he para-itie on plant-: 



Botrytis Cinerea I'd-. Tin- enemy of many plant- ha- already 

 been noticed as ,sV/, /-,,//,//,/ /'////. .//'///' ] 30 also /' /' ' ' I'ubeiif. 



