Computer decision aids can help integrate and apply diverse sources of information and expertise to problems of integrated pest management (IPM) in agriculture and forestry. AppleMgr combines a rule-based expert system with databases and spreadsheets in a prototype decision aid intended to be expanded and modified for use by extension...
Several plant hormones, including ethylene and jasmonates, are known to mediate responses against biotic and abiotic stress. The first and second objectives of this thesis were (i) to elucidate the role of ethylene in defense responses against Botrytis cinerea and specifically (ii) to determine the potential contribution of ethylene response...
Recent investigations indicate that several latent viruses of
apples exist in common commercial apple stocks, but these viruses
and their relationships are incompletely understood. This thesis
describes investigations of crab apples as indicators of latent viruses
of apples.
Eighty-eight varieties and species of crab apples were tested
as indicators of...
The ecological interrelationships of mites occurring in
and near the Hood River Valley, Oregon, pome fruit orchards
were investigated to determine the possibility of an integrated
control program using the species already present.
Survey sampling methods were used to study mites on wild
hosts (Crataegus douglasii Lindl., Crataegus columbiana Howell,...
The biology and behavior of the codling moth, Cydia pomonella (L.), was studied to
determine factors responsible for differences in susceptibility to moth damage among apple
and pear cultivars.
In release experiments, codling moth adults were intercepted in significantly greater
numbers in host (apple, pear) than in non-host (maple) trees,...
A pest management program for variegated cutworm (VC), Peridroma
saucia (Hubner), in Oregon peppermint was developed based on studies
of pheromone trapping, sampling methods, and economic thresholds.
Pheromone traps effectively trapped VC males and were used to
reflect development and oviposition trends. Trap height was linearly
correlated to moth catch...
Basamid^R (3,5-dimethy1-1,3,5,2H-tetrahydrothiadiazine-
2-thione) is a crystalline powder used as a soil sterilant.
This fumigant acts in soil by decomposing to methylisothiocyanate
(MITC), the primary active ingredient, as well as
hydrogen sulfide, methylamine, and formaldehyde. In wood,
Basamid decomposes too slowly to be efficacious against
decay fungi unless amended with various...
Crown gall disease is an agricultural problem caused by the soil-borne bacterium, Agrobacterium tumefaciens. A. tumefaciens oncogenes cause transformed plant cells to overproduce the hormones, auxin and cytokinin. High hormone levels cause unorganized plant cell growth resulting in a gall. Control of crown gall disease is difficult because after plant...
The objective of this dissertation is to introduce low-cost processing methods for the fabrication of ZnO transparent thin-film transistors (TTFTs). A novel method for depositing ZnO body layers via spin-coating of a zinc nitrate-based spin solution is presented. The processing conditions of spin-coated ZnO are optimized to produce continuous and...