DISEASES OF FRUIT CROPS 



General 



Calif. Insect Vectors and Their Relation to Virus Diseases of 



Deciduous Friiits and Berries of California . (1) Learn vectors 

 of deciduous fruit trees and bush berries; (2) study life history 

 and ecology of vectors; (3) learn host range of viruses by insect 

 vectors; (A) investigate: differential efficiency among vectors 

 and factors affecting efficiency, length of time insect vector 

 must feed on a plant to acquire or transmit the virus; latent 

 period of virus in vector, multiplication or lack of multiplifcation 

 of virus in vector, ability of vectors to carry related and un- 

 related viruses in their bodies simultaneously} (5) control virus 

 diseases by vector control. 

 Qit. & Parasitol. 1365-B 



Calif. The Marketing of Deciduous Tree Fruits and Berries in Both 

 Fresh and Processed Outlets as Influenced by So-Called Transit 

 or Market Disorders, With Special Emphasis on the Physiological 

 Effects of Control Treatments . To learn (l) effect of recom- 

 mended control measures for pathogenic organisms on physiology 

 of said fruits; (2) cause of post- harvest physiological dis- 

 orders; (3) relationship of factors favoring development of 

 disorders; (A) ways of preventing or reducing disorders; (5) 

 ways to cause growers, shippers and processors to institute 

 ways of eliminating disorders. 



Agr. Econ., Pomol., PI. Path. I656 



Idaho The Identity and Control of Cankerous Aerial Disorders in 

 Orchard Trees . To (1) determine the presence and distribution, 

 with respect to host and locality, of various kinds of cankerous 

 aerial disorders in orchards of Idaho deemed serious enough to 

 warrant investigation; (2) determine causes of disorders; (3) 

 determine satisfactory and practical curative or preventive 

 measures for disorders found and deemed serious enough to warrant 

 comnercial control programs; and (U) release of this infonnation 

 through proper channels. 



PI. Path. 250 Coop. ARS 



Ind. Identification and Control of Tree and Snail Fruit Virus 



Diseases in Indiana . (1) Survey by indexing fruit varieties, 

 clonal stocks, and native plants of fruit species for presen<3% 

 of virus disease^ Learn (2) host irange and role of host species 

 and environmental factors in disease syndrome of fruit virus 

 diseases; (3) spread and economic loss occasioned by virus diseases 

 in fruit plants; (A) study control of fruit virus diseases by 

 heat and chemical therapy; (5) maintain virus- free sources of 

 important fruit varieties for small-quantity distribution to 

 propagators within the State. 



Hort., Bot. tt PI. Path. 882 (NC-U) 



