Oreg. 
Oreg. 
Orege 
Texas 
W. Vae 
= 99 = 
Virous and Similar Diseases of Orchard Trees. To determine 
identity and distribution of virous and virous-like diseases of 
orchard trees including insect vectors. 
Ent., Pl. Path. 44 
Determination of Insect Vectors of Peach Spot and 
Associated Viruses. To (1) determine the Seal responsible 
for transmission of peach ring spot and associated viruses; and 
(2) use the vector(s) when found, to isolate components of the 
complex and maintain these cultures for use by various cooperating 
plant pathologists and entomologists of the Western Region. 
Ent., Pl. Path. 344 (W-22) 
Studies on the Relationship of the Mite Pediculopsis Graminum 
Reut. To Silver Top Disease in Oregon Grasses. (1) Study biology 
of Pediculopsis graminum Reut. and its relation to Fusarium poae. 
(2) Learn how other arthropods may be involved in mite-disease 
complex. (3) Test various miticides and insecticides for control 
of P._graminum. 
Ent., Bot. and Pl., Path. 291 
The Cause and Control of "Pimples" A Serious Defect of Water 
melons. To (1) establish cause of defect of maturing watermelons 
known as "pimples", "sand bumps", or "water bumps"; (2) determine 
how it spreads, and in what form and where inciting agent exists 
in winter; (3) learn what other plants, harbor causal agent or 
show related condition; and (4) develop control measures. 
Pl. Physiol. and Path., Ent., Hort. 904 
The Symbiotic Relationships Between Microorganisms and Insect 
Vectors of Plant Diseases. To investigate insect transmission of 
plant diseases as a distinct biological phenomenon fundamental to 
general sciences of plant pathology and entomology, especially to 
determine for cucumber beetles; (1) how cucumber wilt bacterium 
survives in the insect body, (2) if symbiosis is involved, (3) 
if bacteria are transmitted thru eggs to larvae, (4) if bacteria 
survive pupal period, and (5) if physiological condition or physi- 
cal environment of beetles influence interrelations of vector and 
bacterium. 
Pie batho 
Virus Diseases of Sour Cherry and Other Stone Fruits.--(1-3) 
To learn (1) rate of spread of cherry virus diseases, (2) method 
of spread of stone fruit viruses in general with reference to 
possible insect vectors of cherry yellows and ringspot, (3) effect 
on yield and tree growth caused by viruses of sour cherry. (4) 
Attempt to locate virus-free sources of Mazzard cherry seed for 
commercial propagation. 
Pl. Path. 89 (NE-14) 
