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Ind. The Etiology and Control of Virus Diseases of Plants xn 



Indiana . (1) Learn viruses or virus complexes causing loss in 

 economic crop plants; (2) characterize selected viruses of 

 importance in regard to vector relationships, host-virus reactions, 

 and physico-chemical properties; (3) explore effectiveness of 

 chemical therapy and protection in control of virus infection and 

 multiplication. 



Bot., PI. Path. 857 



Kans. Insect Vectors of Plant Diseases . To study (1) nature and 

 extent of injury caused by toxicogenic insects; (2) ecology and 

 habits of known vectors; (3) search for new vectors; (4) study 

 chemical and other control methods of vectors. 

 Ent., Bot. & PI. Path. 475 



Ky. Transmission of Virus Diseases of Field Crops by insects and 



Mites . To learn (1) which insects and mites transmit virus 

 diseases of field crops; (2) entomological factors influencing 

 virus transmission of these diseases; (3) host naturally infected 

 by selected viruses transmitted by insects or mites; (4) find new 

 methods and improve and simplify present methods of achieving 

 above objectives. 



Ent., Bot., Agron. 1010 



Mich. Insect Vectors of Crop Plant Diseases . To (1) learn 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 



Mo. Chemical Inhibition of Plant Virus Diseases . Study physiology 



of virus multiplication. Isolate and identify all biochemical steps 

 involved in synthesis of virus particle. Study multiplication of 

 nucleoproteins in healthy and diseased tissues. Study effects of 

 antimetabolites on synthesis of proteins and nucleic acids. Make 

 serological and purification studies. 

 Hort. 285 Coop. ARS 



Nebr. Fundamental Research on Virus Diseases of Plants and Their 

 Control Under Nebraska Conditions . To study factors governing 

 infection, host range, mode of transmission, movement of viruses 

 within host, mutation of viruses and use of less virulent forms 

 to protect crops from disease, and a survey of virus diseases. 

 PI. Path. 342 



