Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
Phenology Of The Western Cherry Fruit Fly (Diptera: Tephritidae) In Utah And Washington, Vincent P. Jones, Diane G. Alston, Jay F. Brunner, Donald W. Davis, Mark D. Shelton
Phenology Of The Western Cherry Fruit Fly (Diptera: Tephritidae) In Utah And Washington, Vincent P. Jones, Diane G. Alston, Jay F. Brunner, Donald W. Davis, Mark D. Shelton
Office of the Dean (CAFES) Scholarship
The flight period of the western cherry fruit fly, Rhagoletis indifferens Curran, was investigated in Utah tart cherry, Prunus cerasus L., orchards from 1983 to 1989 and in Washington sweet cherry, Prunus avium L., orchards between 1982 and 1988. In Utah, flies were first detected on 31 May 1989, but the average time of first detection was 9 June across nine site-years. In Washington, the first fly was detected on 23 May 1988, with an average first detection time of 1 June in the three site-years. On a degree-day (DD) scale (lower threshold of 5°C and no upper threshold), detection …
Soil Tests For Aluminum Toxicity In The Presence Of Organic Matter: Laboratory Development And Assessment, M. G. Whitten, G. S.P. Ritchie
Soil Tests For Aluminum Toxicity In The Presence Of Organic Matter: Laboratory Development And Assessment, M. G. Whitten, G. S.P. Ritchie
Food Science and Nutrition
Al toxicity in plants is related to the activity of Al3+ and Al-hydroxy monomers in the soil solution, whereas Al complexed with ligands such as fluoride (F), sulphate (SO42-), and oxalate is not toxic. Estimation of toxic Al relies on measurement of “labile”; Al after short contact times with colorimetric reagents or cation-exchange resins. However, shifts in equilibrium may result in non-toxic forms of Al reacting with the complexing agent or resin.
A series of laboratory experiments tested the degree to which labile Al is related to Al3+ in simplified media and compared methods of …
Life History And Descriptions Of Immature Stages Of Tephritis Baccharis (Coquillett) On Baccharis Salicifolia (Ruiz & Pavon) Persoon In Southern California (Diptera: Tephritidae), Richard D. Goeden, David H. Headrick
Life History And Descriptions Of Immature Stages Of Tephritis Baccharis (Coquillett) On Baccharis Salicifolia (Ruiz & Pavon) Persoon In Southern California (Diptera: Tephritidae), Richard D. Goeden, David H. Headrick
Horticulture and Crop Science
Tephritis baccharis (Coquillett) is bivoltine and monophagous on Baccharis salicifolia(Ruiz & Pavon) Persoon in southern California. The egg, the second and third instar larvae, and puparium are described and illustrated. Eggs are inserted singly into terminal buds of main and axillary branches in late winter or early spring. First instar larvae hatch and tunnel into the pith just basad to the apical bud where they initiate gall formation. Gall and larval growth continue slowly into the fall, when pupation occurs. Most F1 flies emerge, mate, and after about one week begin oviposition. Some F1 flies that emerge …
A Soil Test For Aluminium Toxicity In Acidic Subsoils Of Yellow Earths In Western Australia, S. J. Carr, G. S.P. Ritchie, W. M. Porter
A Soil Test For Aluminium Toxicity In Acidic Subsoils Of Yellow Earths In Western Australia, S. J. Carr, G. S.P. Ritchie, W. M. Porter
Food Science and Nutrition
Many of the yellow earths in the Western Australian wheatbelt have naturally acidic subsoils which can reduce the yield of wheat grown on them. Current methods of assessing soil acidity cannot identify which soils have subsoil acidity severe enough to restrict wheat yields.
We conducted 53 field experiments at 34 sites in 5 regions over 3 years to determine the relationship between yield of wheat and several different indices for identifying subsoils with toxic concentrations of aluminium, Al. Initially, we identified that the concentration of aluminium, [Al], in the soil solution and in 1 : 5 0.005 M KCl extracts …
Calcium Chloride Extractable Cadmium As An Estimate Of Cadmium Uptake By Subterranean Clover, M. G. Whitten, G. S.P. Ritchie
Calcium Chloride Extractable Cadmium As An Estimate Of Cadmium Uptake By Subterranean Clover, M. G. Whitten, G. S.P. Ritchie
Food Science and Nutrition
Cadmium (Cd) may accumulate in soils which have been regularly fertilized with phosphate fertilizers which contain Cd originating in rock phosphate. Soil was taken from three sites in the wheatbelt of Western Australia which were estimated to have received different amounts of phosphate fertilizer over the past decade. The pH was adjusted with dilute HCl or CaCO3. No Cd was added experimentally. The concentration of Cd in the whole tops of Trifolium subterraneum cv Mt Barker grown in a glasshouse pot experiment increased from 0.2-0.8 µg g-1 dry wt at pH 6.6-6.9 (1:5 0.01 M CaCl …
A Comparison Of Soil Tests To Predict The Growth And Nodulation Of Subterranean Clover In Aluminium-Toxic Topsoils, M. G. Whitten, G. S.P. Ritchie
A Comparison Of Soil Tests To Predict The Growth And Nodulation Of Subterranean Clover In Aluminium-Toxic Topsoils, M. G. Whitten, G. S.P. Ritchie
Food Science and Nutrition
Total Al concentration or pH in 1∶5 10 mM CaCl2 extracts and exchangeable Al in 100 mM BaCl2 extracts cannot always distinguish between Al-toxic and Al-nontoxic topsoils. Our objectives were to compare the abilities of different measures of Al and pH in various extracts to predict the effects of acidity on growth and nodulation of subterranean clover. In a glasshouse experiment, Trifolium subterraneum L. cv. Mt Barker was grown in acidic soils from 3 sites in the Western Australian wheatbelt with different histories of phosphate fertilizer application. The pH was adjusted to give a range of …
Review Of Pacific Marlins: Anatomy And Physiology, By Peter S. Davie, Harry L. Fierstine
Review Of Pacific Marlins: Anatomy And Physiology, By Peter S. Davie, Harry L. Fierstine
Biological Sciences
No abstract provided.