- 26 - 



Ohio Disease and Insect Resistance in the Tomato; A Breeding 



Project * To (l) develop varieties of tomatoes, resistant to 

 Fusarium wilt, leaf mold, mosaic, and Septoria and Alternaria 

 leaf spots by combining genes for resistance in wild species 

 with genes for desirable qualities in domestic species; (2) 

 study fungi causing diseases from standpoint of physiologic 

 races and their distribution; (3) isolate differential 

 accessions for identification of physiologic races of above 

 disease producing organisms; (4) evaluate developed accessions 

 for resistance to insects which attack glass house-and field- 

 grown tomatoes; and (5) study nature of resistance to disease 

 to determine loci on chromosomes of the genes which govern 

 resistance and to conduct embrylogical studies to determine 

 cause, nature and degree of incompatibility in interspecific 

 hybrids within genus Lycopersicon. 

 Bot. 37 



Ohio Cytogenetics and Embryology of the Domestic Tomato . the 



Wild Species of Tomato and Their Hybrid Derivatives in Relation 

 to Disease Resistance, Hybrid Sterility and Self Incompatibility . 

 To study (1) pollen tube growth, fertilization, embryo and 

 endosperm development in tomato, its wild relatives,, and inter- 

 specific hybrids derived from them; (2) chromosome number and 

 behavior in interspecific hybrids of tomato and their derivatives; 

 (3) genetics of self-incompatibility in genus Lycoperisicon. 

 Bot. 37-1 



Ohio Biology of the Tomato Early Blight Organisms with 



Reference to the Existence of Races and Resistance . To (l) 

 determine existence of physiological races of A. solani, 

 A. terms and A. tomato , (2) study parasitism of above named 

 fungi to determine if small necrotic lesions constitute 

 resistance of susceptibility to the parasites; and (3) screen 

 tomato P.I. accessions for resistance to above organism. 

 Bot. & PI. Path. 72-2 A (NC-7) 



Ohio Control of the Mosaic Diseases of Tomatoes . To (l) develop 



a method to control mosaic diseases of tomatoes caused by Marmor 

 tabaci . var. vulgare . and other viruses; and (2) study basic 

 principles of tobacco mosaic virus and other viruses involving 

 isolation and purification of virus, study in vitro , and parasitism 

 of virus. 



Bot. 86 



Pa. Genetics and Cytogenetic Studies in Capsicum Frutescens . — 



The Cultivated Pepper . To determine (1) how available material 

 may be used in breeding new commercial varieties or improving 

 standard varieties; (2) F-, combining ability of pepper varieties 

 and strains; (3) feasibility of using F^ or Fo generations for 

 commercial production; and (4) amount of natural crossing in 

 pepper, and isolation required to obtain true breeding stocks. 

 Hort. 1049 (NE-9) 



