- 3 - 



ffi-ch. Tree Fruit Virus Diseases,— -Stone Fruit Viruses Diseases, — 



Pome Fruit Virus Diseases , To (1) learn virus content and 

 extent in stone-fruit stock by further survey and indexing; (2) 

 learn new or undiscovered viruses by indexing trees with unusual 

 symptoms; (3) learn more accurately, host ranges of several 

 important viruses; (A) investigate possibility of new and more 

 effective control measures; (5) investigate viruses of rootstocks; 

 and develop disease-free root stock sources; (6) develop and 

 maintain disease-free sources of varieties of stone fniits; (?) 

 investigate stony- pit virus of pears; and (8) learn host range of 

 viruses on Hyslop crabapple, 



Bot, & PI, Path. 36 Coop, ARS 



Minn. Fruit Diseases . 2, Identification, Occurrence, Distribution 

 and Severity of Viruses, 3. >fi.scellaneous Diseases of Fruit, 

 5. Diseases of Small Fruits and Methods of Control. 12 Diseases of 

 Tree Fruits and Methods of Control. 

 PI. Path. & Bot. 2206 



Minn. Fruit Diseases. — 2. Identification, Occurrence, Distribution 



and Severity of Viruses . To determine the identification, occurrence, 

 distribution and severity of viruses of fruit and investigate the 

 host range and factors responsible for their multiplication and 

 production. 



PI. Path. & Hot., Hort. 2206-2 



Minn . Fruit Diseases. — 3« Miscellaneous Diseases of Fruit . To 



study miscellaneous fruit diseases in detail so as to determine 

 their effect upon the fruit industry. 

 PI. Path. & Bot., Hort. 2206-3 



Minn. Fruit Diseases. — 12. Diseases of Tree Fruits and Methods 



of Control . To determine (1) resistance of pear varieties and 

 seedlings to fire blight; and (2) fimgi causing wood decay in 

 apples in Minnesota and the conditions which favor the develop- 

 ment of decay. 



PI. Path. & Bot. 2206-12 



MLnn. Epidemiology of Leaf Spots and Other Foliage Diseases of 



Crop Plants. — 5» Tree Fruits and Small Fruits . To gain infor- 

 mation on prevalence, etiology, epidemiology, physiologic 

 specialization and methods of control of tree and small fruit 

 diseases. 



PI. Path. & Bot, 2219-5 



Jfi.nn. Cause and Control of Biological and Chemical Deterioration 

 of Agricultural Products in Storage, — 4» Fruits , To determine: 



(1) microorganisms or factors responsible for fruit deterioration; 



(2) main factors governing development of deterioration and nature 

 of deterioration; and (3) chemicals or control methods, 



PI, Path, & Bot, 2220-A 



