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La. Studies on Sugar Cane Diseases . To (l) study cause and 



control of diseases of sugar cane with special emphasis on 

 Phytophthora rot, mosaic, red rot and root rot; (2) develop 

 information on resistance of cane varieties to major diseases 

 of sugar cane; and (3) investigate nature of seed cane failures 

 and stubble failures and develop methods of control. 

 PI. Path. 766 



La. The Ratoon Stunting Disease of Sugar Cane . To determine (l) 



presence of ratoon stunting virus or a similar one in Louisiana; 

 (2) role of virus in degeneration of vai;ieties which apparently 

 are senescent; (3) if hot water treatment will permit develop- 

 ment of virus free seed stocks; (4) all modes of spread of the 

 disease to aid control; (5) a means other than inoculation to 

 identify virus in stalks either not obviously stunted or in area 

 where environment is not productive of good growth; (6) inheri- 

 tance of resistance to obtain production of new resistant 

 varieties; and (?) environmental factors responsible for severity 

 of the disease. 

 PI. Path. 773 



La. Fundamental Studies on Sugar Cane Diseases , (l) Learn 



nature of causative agent of ratoon stunting disease of sugar 

 cane; (2) learn specific diagnostic methods for disease. (3) 

 Develop additional control methods for the disease. 

 Bot., Bact., PI. Path. 910 



P. R. Sugar Cane Breeding . To develop by hybridization new and 

 superior varieties of sugar cane resistant to mosaic and other 

 diseases. 



Agron., Hort. 38 



P. R. The Study and Control of Ratoon-Stunting Disease of Sugar 

 Cane in Puerto Rico . (l) Test reaction of varieties available 

 in Puerto Rico to a stunting-disease virus. Learn (2) which 

 is most effective curative heat treatment under Puerto Rican 

 conditions; (3) method of increasing significantly the germina- 

 tion of heat-treated cames. (4) Develop more rapid and 

 accurate methods of diagnosis. Study (5) host range of virus 

 among wild and cultivated grasses and other plant families; 

 (6) properties of causal virus. Explore: (7; possible 

 occurrence of strains of virus and study them if evidence of 

 their presence is found; possible occurrence of insect vectors 

 of virus. 



PI. Path., Agron., Ent. 123, Coop. ARS 



