Introduction of American serpentine leaf miner, Liriomyza trifolii, into England and Wales and its eradication from commercial nurseries, 1977–81     

P. W. BARTLETT  D. F. POWELL 《Plant pathology》1981,30(4):185-193

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Incidence of lameness requiring veterinary treatment in dairy cattle in Queensland   总被引：2，自引：0，他引：2  

MW McLENNAN 《Australian veterinary journal》1988,65(5):144-147

A survey of the incidence of lesions causing lameness in dairy cattle was conducted by veterinarians in 9 practices in Queensland between November 1984 and July 1985. One hundred and eighty five cases were treated in 83 dairy herds. The average incidence of lameness which required treatment by veterinarians was 2.7 cases per 100 cows per 9 months, with a range of 1.4 to 5.5% in the 9 practices. Foot lesions constituted 83.2% of all lesions; the most common being interdigital necrobacillosis (15%), deep sepsis (8.9%), white line disease (8.4 per cent), axial groove fissure (8.4%), bruised sole (5.6%) and foreign body in the sole/heel (5.6%). Sixty-five per cent of foot lesions occurred in the hind feet and 63% of these lesions occurred in the lateral claw, while 37% of foot lesions occurred in abnormally shaped claws. Limb lesions accounted for the remaining 16.8% of lesions, and 50% of these lesions occurred in the hip and stifle, while trauma was the main cause of limb lesions.  相似文献   

The eradication campaign against American serpentine leaf miner, Liriomyza trifolii, at Efford Experimental Horticulture Station   总被引：1，自引：1，他引：0  

D. F. POWELL 《Plant pathology》1981,30(4):195-204

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Major lymph nodes of the head of the fallow deer (Dama dama) and lymphatic drainage of antlers     

GK BARRELL  MW SIMPSON-MORGAN 《Australian veterinary journal》1990,67(11):406-407

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Morphological study of tracheal shape in donkeys with and without tracheal obstruction     

R. J. POWELL  N. Du TOIT  F. A. BURDEN  P. M. DIXON 《Equine veterinary journal》2010,42(2):136-141

Reason for performing study: There is limited information on the gross tracheal morphology of donkeys with or without tracheal abnormalities. Objectives: To: 1) examine the morphology of tracheas of donkeys with and without clinical and/or post mortem evidence of tracheal obstruction; 2) record the cross‐sectional dimensions and shapes of tracheal rings at fixed sites; and 3) document prevalence, sites and characteristics of detected tracheal abnormalities. Methods: The tracheas of 75, predominantly aged (median age 30 years, range 7–48 years) donkeys that died or were subjected to euthanasia on humane grounds were examined. Five had severe dyspnoea due to tracheal obstruction (with intercurrent lung disease in 3), while 7 had post mortem evidence of severe tracheal airway obstruction. Every 5th tracheal ring was dissected free and the inner and outer vertical and transverse dimensions and cross sectional areas were measured. Each dissected ring was photographed and the shape of the trachea was classified as normal or, in one of 6 abnormal grades, according to the type and degree of structural abnormality present. Results: The tracheas had a mean of 43 (range 34–50) tracheal rings that tended to be more oval in shape in the distal cervical region. Only 31.2% of rings examined had a circular to oval shape. Dorso‐ventral flattening was present in 0.9% of tracheal rings, dorsal ligament separation in 24.4%, slight cartilage deformity in 26.0%, moderate cartilage deformity in 10.4%, marked cartilage deformity in 1.9% and miscellaneous other abnormalities in 4.9% of tracheal rings. The 12 donkeys with ante or post mortem evidence of tracheal obstruction had significantly increased tracheal abnormality grade in comparison to the remaining donkeys. Conclusions and potential relevance: Structural tracheal abnormalities are present in most old donkeys, but generally do not cause clinical problems in these sedentary animals unless intercurrent pulmonary disease is present.  相似文献   

Biodiversity assessment and conservation strategies   总被引：2，自引：0，他引：2  

van Jaarsveld AS  S Freitag  SL Chown  C Muller  S Koch  H Hull  C Bellamy  M Kruger  S Endrody-Younga  MW Mansell  CH Scholtz 《Science (New York, N.Y.)》1998,279(5359):2106-2108

The efficient representation of all species in conservation planning is problematic. Often, species distribution is assessed by dividing the land into a grid; complementary sets of grids, in which each taxon is represented at least once, are then sought. To determine if this approach provides useful surrogate information, species and higher taxon data for South African plants and animals were analyzed. Complementary species sets did not coincide and overlapped little with higher taxon sets. Survey extent and taxonomic knowledge did not affect this overlap. Thus, the assumptions of surrogacy, on which so much conservation planning is based, are not supported.  相似文献   

Comparison of Whole Ovary Cryotreatments for Fertility Preservation          下载免费PDF全文

L Lotz  T Hauenstein  SM Nichols‐Burns  P Strissel  I Hoffmann  S Findeklee  R Dittrich  MW Beckmann  PG Oppelt 《Reproduction in domestic animals》2015,50(6):958-964

The goal of this study was to compare a traditional slow‐freeze method (TF) with an open unidirectional slow freeze cooling system (UF) for whole ovary cryopreservation. Therefore, whole pig ovaries were randomly assigned to (A) fresh control, (B) traditional slow freeze (TF) or (C) unidirectional slow freeze (UF). Ovaries were perfused with 10% DMSO in Krebs‐Ringer. For TF, whole ovaries were placed in specimen jars containing 10% DMSO and placed into a specialized container for freezing filled with propan‐2‐ol. For UF, whole ovaries were placed within a specially designed container containing 10% DMSO and transferred to a specialized freezing machine (CTE 920). Histological evaluation demonstrated intact morphology of follicles in all groups; however, an overall decrease of follicle numbers in TF (46%) and UF (50%) compared to fresh control. Live/dead assay indicated significantly lower populations of live cells in both TF (60%) and UF (58%) compared to fresh tissue (74%). TUNEL assay confirmed a difference in percentage of apoptotic follicles between fresh and TF, but there was no significant difference between fresh and UF. To improve the structural and functional integrity of whole ovaries, further investigation, especially into directional freezing, is needed. Whole ovary cryopreservation could provide opportunities for women facing fertility loss due to chemo‐ or radiotherapy treatment.  相似文献   

植物健康的综合管理(二)——合理灌溉     

张学军 《农业工程技术:农产品加工》2006,(8):21-22

大部分植物重量的85％～95％都是由水组成的，这些水几乎都是从土壤或基质中获得，因此合理灌溉是使植物健康生长的基本条件之一。  相似文献   

A critique of studies evaluating glyphosate effects on diseases associated with Fusarium spp.   总被引：1，自引：0，他引：1  

J R POWELL  & C J SWANTON† 《Weed Research》2008,48(4):307-318

With the large-scale adoption of glyphosate-resistant crops in North America, there are concerns that non-target microbial populations might be affected by increased frequency of glyphosate use. Stimulation of fungal species associated with crop diseases, including Fusarium spp., has been observed in laboratory and glasshouse experiments. Although field surveys in Saskatchewan detected positive associations between the incidence of Fusarium head blight and application of glyphosate formulations, few field experiments have been successful at demonstrating a stimulatory effect of glyphosate on crop diseases, including diseases associated with Fusarium spp. Taken at face value, there is little evidence from experimental field trials to support a causative link between glyphosate and crop diseases associated with Fusarium spp. However, we are concerned that the experimental field trials investigating links between glyphosate and Fusarium spp. are not representative of interactions that occur under actual farming conditions. In addition, inadequate consideration may have been given to microbial ecology during the design and maintenance of these experimental field trials. At this time, there is insufficient evidence to prove or disprove a link between glyphosate and crop diseases associated with Fusarium spp. and this area should receive high research priority, given the rapid and widespread increase in glyphosate use.  相似文献   

Fumigation as a Means of Eradicating Colorado Beetle in Imports of Potatoes, Grain and Timber     

D.F. POWELL  K.A. MILLS 《EPPO Bulletin》1981,11(3):371-376

Colorado beetle is not indigenous to the United Kingdom, but is often found in imported produce and is a serious pest of potato crops. The efficacy at 10°C of five fumigants was tested against diapausing beetles in the laboratory. Phosphine was the most effective giving 100 % kill in tests with a concentration time product of 6.7 g.h/m³; 100 % kill was also achieved in tests with: methyl bromide at 166 g.h/m³; carbon tetrachloride at 4000 g.h/m3; ethylene dichloride at 6240 g.h/m³; and 1,1,1-trichloroethane at 11600 g.h/m³. A set of practical dosage schedules is given.  相似文献