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Ohio Stone Fruit Virus Diseases and Their Control , To (l) 



devise methods for detecting different virus diseases of stone 

 fruits; (2) determine distribution and importance of various 

 stone fruit virus diseases in Ohio; and (3) develop economical 

 and effective measures for control of stone fruit virus diseases, 

 Bot. 85 (NC-IA) 



Or eg. Virus and Similar Diseases of Orchard Trees , To determine 



identity and distribution of virus and virus-like diseases of 

 orchard trees. 



Ent., PI. Path. kU 



Greg. Non- Virus j3is eases Attacking Cherries and Other Stone Fruits , 



(l) Learn occurrence, cause, and possible control of diseases of 

 sweet cherries known as "dead bud"; (2) study life cycle and control 

 of bacterial canker as incited by Pseudomonas syringae ; (3) 

 initiate studies on non-virus decline, early fall coloration, and 

 leaf roll of Montmorency cherry; (4) study effect and control of 

 silver leaf incited by Stereum purpureum on fruit trees; (5) 

 learn possibility of controlling Armillaria root rot of cherries 

 under Oregon conditions; (6) study other orchard disease problems 

 api^arently not incited by viruses. 

 Bot., PI. Path. 92 



Pa. Virus Diseases of Stone Fruits . (l) Identify specific virus 



entities associated with yellows disease of sour cherry, and X 

 yellows diseases of peach; (2) learn effects on host of each virus 

 alone or in combination; (3) formulate feasible methods of disease 

 control, 



Bot. & PI. Path. 1122 (NE-U) 



S, C. Importance of Xanthomonas Pruni Cankers on Peach Trees as a 



Source of Infection , To learn (1) time of formation and develop- 

 ment of bacterial cankers on peach trees; (2) dissemination of 

 bacteria from cankers following spring and environmental conditions 

 which favor their spread. 



PI. Path. 28 Coop. ABC 



S. C. Identification and Control of Parasitic Nematodes Affecting 



Peach~I^ee3 in South Carolina , (l) By orchard survey, learn species 

 of nematodes present and responsible for fruit decline; (2) learn 

 relation between peach root stocks and parasitic nematodes; (3) 

 compare relative effectiveness of several nematocides as preplant 

 fumigants; (4) compare relative effectiveness of several nemato- 

 cides as post-plant fumigants on established trees and learn most 

 effective way of using. 



Bot.& Bact. 342 (S-19) 



