a Gs 
Colo. Insect and Mite Populations and Their Relationship to 
Virus Transmission in Stone Fruits. (1) Learn relationships 
of insect and mite populations to virus disease incidence 
for western Colorado fruit districts. Investigate (2) influence 
of Eriophyes insidiosus K and W, and other related species, in 
transmission of peach mosaic virus and study the possible 
insect or mite vectors of rasp leaf of cherry; (3) influence 
of biological control and cultural practices in reduction of 
virus incidence. (4) Develop selective chemical controls 
which promote populations of beneficial species. (5) Learn 
means of recognizing viruliferous species in overwintering 
condition AG increasing efficiency of eradication procedures. 
Ente 3 
Gae A Study of New Insecticides and Fungicides for the 
Control of Peach Insects and Diseases. To find more 
effective insecticides and fungicides for the control of 
peach insects and diseases. 
Horte,s Pl. Path. 100 
Ohio The Biology and Control of Insect Pests of Stone 
Fruits. To study life history, seasonal and geographic 
distribution of insects and related arthropod pests of 
stone fruits and to develop or improve methods of control; 
with special emphasis on so-called catefacing insects, plum 
curculio, peach leaf miner, and suspected vectors of peach 
and cherry viruses. 
Ent. 18 Coop. ARS 
Pae The Biology and Control of the Fruitflies 
oletis Cingulata Loew and R. Fausta 0.S. in the Great 
Lakes Region. To study the influence of environment on 
populations of the cherry fruitflies, and to evaluate 
several compounds in comparisons with the new recommended 
lead arsenate as control agents. 
ZOOL ey Ent. 1012 
Pae Breedi ng improved Varieties of Raspberries. To 
(1) breed improved raspberries having resistance to 
freezing, disease, and insects, and desirable 
horticultural characteristics, (2) determine types and 
extent of virus infection, (3) identify and study insect 
vectors causing transmission of viruses, and (4) study 
inheritance of certain characteristics. 
Hort., Zool., Ent., Bot. 1094 
