W. \. OliTO.N. 



IK liKVKI.dl'MKM (W DISEASK IIKSISTAM VAlilKïlKS (IF l'I.A.NÏS. 



uiiiversal occurrence of (lie perilhccia on llie mois of cowpea and waternielon, 

 and (less commonly) collon planis dead l'roin wiU. Ile sliowed thaï a Fusarhim 

 was tlie conidial slage of lin» .Xeocosmopora, and developed Ihe ascogenous 

 slag-e in pure culluies of Uiis l'"usariuni, He poinledout in liis liullelin lliîd tlie 

 genelic connection of ttie parasitic l'orni witli Neocosmospora had not Ijeen l'idlv 

 established Ijy grewing the ascospores in cultures original ing ironi internai 

 conidia, or by securing infections with cidtures originating from ascosporcs. 

 Subséquent worU' by Buller in India and Higgins in Norili C-arolina lias 



'i. lii'lil c>r I |il;iiiJ collon in Soulli C.iinliii.i ni'urly tlestroyeil «llli will. Compare witli next lifiiiro. 



'1. Champ de coton • 1 |ilaml ■. dans la Caroline du Sud. presque enlièremenl 



délriiil par la iiialadie — Comparer avec la figure suivante. 



tlirown sonic doubt on llie parasilisni oi' Xrncdxuiiixpdra and on ils genetic 

 <:onneclion with the \vilt prodiicing Fusaiia. Tliere can be no doubt whatever 

 as to the causal connection of Ihe latter with the wilt diseascs of cotton, 

 walermelon and cowpea. The infection cxperimenls of Dr. Smith hâve been 

 repeated by the wriler willi positive resnlls, which are confirmcd by hundreds 

 of field observations-. 



llefore \\e discuss in delail llic [iroblcnis of resislance and suscci)liliiiily to 

 Ihcsc diseases, the question présents ilselfof the position occupietl in Ihe scale 

 of parasilism by thèse sirains or species of F>i>:ariuiii, and how we inay 

 inlerprcl llic resislance of Ihe hosl. 'riie (>\idence seems to indicatc lh;d thcy 



1. Iliniii; .K.-.l.;. Ihc Will disease ol Vf^mn |mm and llie l'arasilisni of Xcdiosiiw.yioru vasiiilirlii . 

 — Smiiii. Mcm. Dept. Agr. Iiidiii Ikit. Si-r. '2 (ISMO .No. 0. pp. 04. — IIigcijs (I!.-B.). Is Neornsmosimni 

 rd-iiil'ecla (Alk '. Smith tlie paritliciial <l,-i';i' of Ihe Fiis.iriuiii which causes Cowpea «ill, 3'i ml Ami. 



iijii. nfiiiey. c. r:.i/ii. sia.. \'.mi. 



•1 lliiir» W.-A- . The \\ill ili-ca-r nf Ci.llnii and ils Ciiiilinl. liiil. 27. Ilir. !>,/. l'In/s. ,111,1 l',ilh. 

 V. S. Ilt-iil. Af/ric. 



