- 16 - 



Mass. Properties and Importance of Some Fungous and Virus Diseases 



of Carnations and Their Control Measures , To (1) determine 

 fxmgous and bacterial pathogens in commercial propagating stock, 

 including determination of (a) prevalence of pathogens in com- 

 mercial propagating stock, (b) actual value of a culturing tech- 

 nique as a means of detecting and eliminating infection and (c) 

 whether method and effort involved in culturing can be shown to 

 represent an improvement over current cultural patterns as may 

 be shown in measurable differences in disease and yield of 

 flowers; (2) determine effectiveness of various chemicals upon 

 control of Fusarium dianthi , determining action both as therapeu- 

 tants and as soil treatments; (3) determine effect of carnation 

 virus disease upon quantity and quality of flowers produced; {k) 

 determine properties of carnation mosaic virus as follows: (a) 

 effect of H-ion concentration on stability of carnation mosaic 

 virus, (b) optimal pH for inoculation by carborundum technique, 



(c) concentration of carnation mosaic virus in diseased plants, 



(d) effect of aging upon infectivity of carnation virus, and (e) 

 thennal inactivation time of carnation mosaic virus; and (5) 

 evaluate diagnostic tests for detection of virus infected plants, 



Bot, 23 



Mich, Insect Vectors of Crop Plant Diseases , To (l) determine 



insect vectors of aster yellows on potatoes, lettuce, carrots, 

 gladiolus, etc; (2) study bionomics of species concerned; 

 including life history, migration, food plants, ecology, and 

 control; (3) study mechanics of disease transmission by species 

 under study; (4) make inoculation experiments with various 

 virus diseases, using accurately determined species or races 

 of insects; and (5) by mass transfers of infected insects to 

 non-infected plants of the same and of different species, 

 Ent, 78 



Minn. Diseases of Ornamental Crops 



PI, Path,, Bot. 2205 



Mss, Studies on Diseases of Ornamental Plants in Mississippi . 



To (l) ascertain and define major disease problems of importance 

 to ornamental culture and study inciting agents concerned; and (2) 

 determine practical measures for control of these diseases, the 

 type depending on natiire of the disease; including determination 

 of phytotoxicity and compatibility of various fungicides on orna- 

 mentals, evaluation of various fungicides for control of more 

 prevalent diseases, development of disease resistant varieties, etc, 

 Hort, , PI, Path, HK-5, HL-7 



Mont, Diseases of Selected Ornamental Plants in Montana . To give 



special attention to the diseases of economic crops such as sweet 

 peas, asters, gladiolus, geraniums, stocks and carnations, includ- 

 ing (l) nature of the disease; (2) predisposing factors of sus- 

 ceptibility of the hosts, and (3) control of diseases. 



M.S, 904, B&B 36, Hort, 6l 



