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Mont, Viroses of Sweet and Sour Cherries in Montana , To study 

 the occurrence, symptoms, spread and control of viroses of 

 sweet and sour cherries in Montana, especially little cherry 

 and bud and scion perpetuated diseases, 

 Bot. & Bact, MS 830 



Mont . Iter relation of Lambert Mottle and Latent Virus Complexes 

 in Sweet Cherries , Learn effect, condition, and behavior of 

 trees infected with Lambert mottle as symptom-expressing and 

 as a latent virus on different varieties of sweet cherries; 

 (2) learn possible occurrence of Lambert mottle on various 

 native and cultivated species of Prunus; (3) stirly possible 

 interrelation and combined effect on trees of Lambert mottle 

 with other viruses; ring spot, sour cherry yellows, prune 

 dwarf, mottle leaf, etc; (U) study possible occurrence of 

 strains in Lambert mottle virus; (5) identify vectors .involved 

 in spreading virus, 



Hort,, Bot, & Bact, 3S MS 96? (W-22) 



Nebr, Serolopjical Investigations of the Stone Fruit Viruses , 



Learn more specific means of isolating and identifying stone 

 fruit viruses, 



PI, Path, 539 (NC-IA) 



N, J, Factors Involved in Susceptibility to and Infection of 



Peach by Fusicoccum Amygdali (Canker) and X, Pruni, (Bacterial 

 Spot), and Ways of Controlling These Diseases , CankerT UJ 

 Learn infection sites, and periods during which infection 

 occurs; study (2) conditions which render these sites suitable 

 infection courts, and changes that occur to impart resistance 

 to them; (2) differences between varieties to account for 

 differences in susceptibility; consider (U) ability of fvingus 

 involved to disolve and use various substrates; (5) effect of 

 nutrition and winter injury on susceptibility and disease 

 development; (6) value of fungicides and defoliation as controls; 

 (7) develop suitable test procedures for rating peach seedlings 

 as to susceptibility, 

 PI, Path. 452 



N, T, Virus sjid Jirus-Like Diseases of Tree Fruits , — 1, X-Disease 

 (Cornell) of Stone Fruits", To leam(l) if any transmission of X-disease 



virus occurs from 1 tree to another of the cultivated sorts, and 

 if spread can occur only from choke cherry; (2) effect of root- 

 stocks on symptom expression and on effect of virus on cherry 

 tree; (3) relation of other viruses to X-disease virus, and their 

 influence on expression of symptoms and on effect on tree, 

 PI, Path., Fomol, 134-1 (NE-14) 



