Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 104 for “"defoliation"”.
-
Effects of defoliation on the cultivated strawberry (Fragaria X ananassa Duch.)
… were conducted to determine the effects of defoliation on photosynthesis, growth and yield of the strawberry. From preliminary photosynthesis experiments it was found that both 'Redchief' and 'Tribute' strawberry leaves reached maximum net photosynthesis (Pn) concurrently with full leaf …
-
Barley growth, physiology, and forage quality as influenced by defoliation and water stress
… the physiological changes that take place after defoliation of barley (Hordeum vulgare L.) after defoliation and their effects on forage-quality characteristics is needed. The objectives of this study were to investigate defoliation and water deficit stress effects on regrowth, physiology and …
-
Soybean transpiration, vegetative morphology, and yield components following simulated and actual insect defoliation
… green cloverworm (Plathypena scabra (F.)) (GCW) defoliation was investigated in several experiments from 1980 to 1983. The primary goals of this research were: (1) to assess the fidelity of simulation methods to actual insect defoliation for one basic physiological process, transpiration; (2) to …
-
Effects of defoliation on regrowth and carbon budgets of three semi-arid Karoo shrubs
… a dwarf evergreen shrub with succulent leaves. Defoliation adversely affected both vegetative growth and reproductive output for periods up to 26 weeks following foliage removal. A gradient of increasing regrowth capacity with decreasing defoliation intensity and frequency was observed in all …
-
Short-term effects of defoliation by gypsy moth larvae on Appalachian headwater streams in Virginia
… investigated the short-term effects of riparian defoliation by gypsy moth larvae on three aspects of headwater stream ecology, water quality, benthic macroinvertebrate community structure, and benthic macroinvertebrate function (expressed as secondary production). The experimental design was to …
-
Effects of Daylength, Temperature and Chemical Defoliants on Senescence, Defoliation and Nitrogen Nutrition of the Apple
Made available in DSpace on 2014-12-14T15:45:31Z (GMT). No. of bitstreams: 1 7709204.pdf: 3002197 bytes, checksum: cc17d4e7b2d18a8852cbe8faccf6bcf1 (MD5) Previous issue date: 1976
-
Effects of European Gypsy Moth Defoliation in Mixed Pine-Hardwood Stands in the Atlantic Coastal Plain
… studies indicate that the potential exists for defoliation and possible tree mortality in mixed pine-hardwood stands. This dissertation describes a field study that was initiated to determine the susceptibility and vulnerability of pure and mixed stands of loblolly pine, oaks and sweetgum in …
-
Inhibition of Flower Bud Initiation and Development in Apple by Defoliation, Gibberellic Acid and Crop Load Manipulation
… the effect of whole-tree and partial-tree defoliation on suppressing spur and lateral flowering and fruit set. Flowering and fruit set were suppressed with defoliation in most cases. Defoliation in early July caused the least amount of flowering the following year and in some cases it was …
-
Quantification and use of pheromone-baited milk-carton traps to monitor gypsy moth populations
… that influence moth capture in pheromone traps. Defoliation, the most obvious expression of high density gypsy moth populations, may have a significant influence on gypsy moth population dynamics. This research focused on the use of defoliation and defoliation related processes to study moth …
-
Modeling the impact of gypsy moth defoliation in individual tree mortality and basal area growth of northern hardwoods of central Pennsylvania
… 1978 and 1985 include estimates of percent defoliation on individual trees. Logistic regression using maximum likelihood estimation was employed to model individual-tree mortality of 15 species in central Pennsylvania that had been defoliated by the gypsy moth. Defoliation was estimated to …
-
Regrowth of Festuca hallii (Vasey Piper) and Stipa curtiseta [(A.S. Hitch.) Barkworth] following defoliation on a hummocky landscape in Central Saskatchewan
… be maintained by providing rest periods between defoliation events based on the number of growing season months for F. hallii to recover production.
-
Effects of Prior Defoliation on the Timing of Life Cycle Events and Susceptibility to Natural Enemies of a Host Specific Gall-Former
… These shifts in conjunction with past and recent defoliation of live oaks by oak leaf rollers (which alter the timing of tissue formation coinciding with B. treatae oviposition) motivated a defoliation experiment inducing variation in the timing of leaf flush, thus altering the timing of …
-
SURVIVAL IN THE FOREST UNDERSTORY: RESILIENCE AND RESISTANCE TO DAMAGE IN NATIVE AND INVASIVE WOODY PLANTS
… and survival responses to varying levels of defoliation in two pairs of native and invasive tree species in the field. Over three growing seasons, I subjected saplings of each species to each of the following treatments: no defoliation control, half defoliation over three years, full …
-
Response of black bears to gypsy moth infestation in Shenandoah National Park, Virginia
… years (1982 - 1986) and years with extensive defoliation (1987 - 1991). Gypsy moth defoliation (> 60% canopy loss) increased from 546 ha in 1986 (1 % of the study area), to 2,304 ha in 1987 (4%), 6,227 ha in 1988 (12%), and 17,736 ha in 1989 (34%). Chestnut oak and red oak habitat types …
-
Männyn neulaskadon arviointi laserkeilauksella
… airborne laser scanning in estimating Scots pine defoliation caused by the common pine sawfly (Diprion pini L.). The study area is situated in Ilomantsi district, eastern Finland. Study materials included high-pulse airborne laser scannings from July and October 2008. Reference data consisted of …
-
The influence of temperature and defoliation on growth and carbohydrates of crownvetch (Coronilla varia L.) and some temperature responses of grass and legume seedlings
… varia</i> L.) to study the influence of various defoliations and three night-day temperature regimes (50-60, 70-80, 90-100 F) in controlled environmental chambers. Top and root growth and acid soluble carbohydrates in rhizomes and tops were studied. Night-day temperatures of 70-80 F produced …
-
Effects of gypsy moth defoliation on acorn production and viability, litterfall, and litter layer depth and biomass in north-central Virginia and western Maryland
The effects of gypsy moth defoliation on acorn production (the seed source for oak regeneration), and the forest floor regeneration environment were investigated. Parameters measured included: acorn quantity, weight, development, and viability; litterfall; and forest floor depth and biomass. …
Page 1 of 6