The hop cyst nematode, Heterodera humuli Filipjev, 1934 was
first reported from Europe in 1894, however, very little is known
with respect to the biology and economic importance of this pest.
Abundant material from Oregon hop yards provided an excellent
opportunity to add additional details concerning the bionomics of this...
Populations of mites and.nematodes were monitored on Watershed 10, H. J.
Andrews Forest. A minimum of 50 families and 60 genera of mites are
present, the majority being Cryptostgmata. Population estimates vary
from 5000-350,000 per square meter. Nine categories of nematodes are
present, most belonging to the saprozoic, dorylaimoid, aquatic...
Published January 1958. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
The treatment of waste water from a corn freezing process by
activated sludge with the aid of alum coagulation was investigated.
Both high and low energy level systems were observed with good
flocculation occurring at the low energy level. Because poor flocculation
occurs at high energy level conditions, alum was...
PART I. The concentration of nickel in some soils may be
insufficient to meet the requirements of enzymes such as
urease in soybeans and hydrogenase in Rhizobium. Nickel
availability in soils was examined by measuring microbial
urease activity in soils which were treated with glucose
and urea. Supplemental nickel was...