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Ge, Control of Peach Diseases , (l) Test materials and 



methods for obtaining better disease control combined with 

 good color and finish on peaches; (2) cooperate with various 

 agencies in this State and nearby States in the annual revisions 

 of the peach spray schedule, 

 PI. Path, 115 



Idaho Behavior and Effects of the Virus Complexes Latent in 



Stone Fruit Varieties and Rootstocks . A, Prevalence — To (l) 

 survey the State of Idaho for all types of abnormal conditions 

 of plums and prunes that are not now understood; (2) map 

 individual orchards for closer observation of field beha\dor 

 of disorders found there; (3) conduct transmission studies for 

 separation of these disorders that are virus in nature from 

 those that fail to transmit to other hosts whether the hosts be 

 the same or different varieties; and (U) determine what viruses 

 are responsible for transmissible diseases found and to investigate 

 correlation between these and the sour cherry j'ellows, ring spot 

 and prune dwarf diseases; B, Effects — To determine effects of 

 the viruses singly and in combination in the plum group and other 

 stone fruit varieties, when the disease and causal viruses noted 

 have been satisfactorily correlated; and C. Miscellaneous — To (l) 

 continue study of conditions for which a causal factor proves 

 difficult to ascertain; and (2) issue periodical reports for the 

 benefit of the regional effort ;inder project W-22. 

 PI. Path., Ent., Hort, 290 (W-22) Coop, ARS 



111, Inheritance and Breeding of Commercially Important 



Characters in the Teach l To (1) originate and introduce 

 varieties with fruit bud hardiness maturing at closely spaced 

 intervals throughout the season; and (2) study manner of 

 transmission of characters from parents to offspring, 

 Hort. 65-324 



111. Stone Fruit Virus Diseases and Their Control; Illinois . 



(l) Purify and characterize peach X-disease virus and cherry 

 necrotic ring-spot virus; (2; diagnose stone fruit virus 

 diseases by serological, physical, or chemical methods; (3) 

 learn insect vectors of peach X-disease virus; (A) ascertain 

 rate of spread of cherry necrotic ring-spot virus under 

 orchard conditions and evaluate effect of ring-spot disease 

 on fruit quality and yield on tree growth; (5) detect 

 presence and learn severity of stone fruit virus diseases 

 in nurseries or orchards and their environs. 

 Hort., Pl.Path. 68-372 (NC-IA) 



