Interaction between timings and doses of quindorac in rice     

J. E. STREET  HOLGER TERESIAK  D. L. BOYKIN†  R. L. ALLEN 《Weed Research》1995,35(2):75-79

Quinclorac (3,7-dichloro-8-quinolinecarboxylic acid) is a new herbicide in United States rice production. Field studies were conducted in 1990 and 1991 in Mississippi to determine the influence of application timings and rates on weed control efficacy and rice yield. Control of Echinochloa crus-galli (L.) Beauv. (barnyard-grass), Sesbania exaltata (Raf.) Rydb. ex A. W. Hill (hemp sesbania) and Ipomoea wrightii Gray (palmleaf morning glory) were greatest with early post-emergence application. Efficacy of pre-emergence application depends strongly on soil moisture, with significantly reduced weed control resulting when applied to dry soil. Weed control with pre-emergence application to moist soil was comparable with early post-emergence application at higher rates of quinclorac. Pre-plant and incorporated quinclorac controlled weeds effectively. Control of E. crus-galli, S. exaltata and I. wrightii ranged from 73 to 99%, 75 to 99%, and 92 to 99% at 28 days after treatment, respectively. Rice yield generally reflected weed control. No rice injury was observed for any treatment. Results indicate that early post-emergence application of quinclorac is the best time for using reduced rates and field conditions at application should be considered with these rates pre-emergence.  相似文献   

Tenosynovitis of the deep digital flexor tendon in horses.          下载免费PDF全文

R W Van Pelt  W F Riley  Jr    P J Tillotson 《The Canadian veterinary journal. La revue veterinaire canadienne》1969,10(9):235-243

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Experimental production of infectious bovine keratoconjunctivitis: comparison of serological and immunological responses using pili fractions of Moraxella bovis.          下载免费PDF全文

G W Pugh  Jr  D E Hughes 《Canadian journal of veterinary research》1976,40(1):60-66

The effect of vaccinating cattle and mice on the development of keratoconjunctivitis was studied. Cattle were vaccinated with whole cells, disrupted cells and pili fractions of three strains of Moraxella bovis. Mice were vaccinated with pili fractions of three strains. The resistance of all vaccinated animals was challenged with virulent cultures of M. bovis. In an attempt to correlate the response seen after vaccination and challenge with a pili fraction of M. bovis, vaccinated cattle and mice were grouped on the basis of signs of disease manifested and compared on the basis of serological responses. Serum samples were tested for antibodies by a gel diffusion precipitin test. A greater number of the sera of resistant cattle had antibodies to the homologous pili antigen than those of vaccinated nonresistant cattle. Cattle vaccinated with disrupted cells were not resistant to infectious bovine kerato-conjuctivitis and their sera lacked antibodies against the pili antigens. Vaccinated mice were more resistant to infectious bovine kerato-conjuctivitis and their sera lacked antibodies against the pili antigens. Vaccinated mice were more resistant to challenge exposure by homologous than heterologous cultures. A greater number of the sera of resistant mice had antibodies to pili antigens than nonresistant mice.  相似文献   

Detection of pregnancy in the bitch: a study of abdominal palpation, A-mode ultrasound and Doppler ultrasound techniques     

W. EDWARD ALLEN  M. J. MEREDITH 《The Journal of small animal practice》1981,22(9):609-622

A total of 474 pregnancy tests (of all three types) were carried out on 82 bitches of a variety of breeds. The practical problems and possible sources of error for each test were studied and their accuracy in predicting whether or not the bitches would whelp was ascertained. Palpation of the abdomen, in the period from 26 to 35 days after mating, was found to be 87% accurate in detecting bitches that would whelp and 73% accurate in detecting bitches that would not whelp. The optimum period for using A-mode ultrasound was found to be from 32 to 62 days after mating. In this period the accuracy of detecting bitiches that would whelp was 90%, and for non-whelping bitches was 83%. Two Doppler ultrasound instruments were used. For the superior instrument, the accuracy of detecting whelping bitches was 85% and 100%, in the periods from 36 to 42 days and 43 days to term, respectively. For detection of non-whelping bitches, the accuracy was 100%.  相似文献   

The effect of pseudorabies (Aujeszky''s) virus infection on young mature boars and boar fertility.   总被引：1，自引：0，他引：1       下载免费PDF全文

L B Hall  Jr  J P Kluge  L E Evans    H T Hill 《Canadian journal of veterinary research》1984,48(2):192-197

This study was designed to determine the effects of experimental inoculation with pseudorabies virus on the reproductive tracts of young adult boars. Pseudorabies virus was inoculated intranasally into 12 boars and intrapreputially into four boars. All animals seroconverted after nasal or preputial inoculation. Semen abnormalities were observed 21 days postinoculation with partial recovery by 50 days postinoculation. Virus was isolated from the preputial sheath of two intrapreputially inoculated boars 12 days postinoculation. It was concluded that pseudorabies virus infection can be established via preputial inoculation and that decreased spermatogenesis and infertility can result.  相似文献   

Correspondence     

Heitor Moreno Jr 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2007,21(6):1165-1165

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Goniodysgenesis associated with primary glaucoma in an adult European Short-haired cat     

Katrin Trost  Robert L. Peiffer Jr  †  Barbara Nell 《Veterinary ophthalmology》2007,10(S1):3-7

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Disease Assessment Concepts and the Advancements Made in Improving the Accuracy and Precision of Plant Disease Data     

Forrest W. Nutter Jr  Paul D. Esker  Rosalee A. Coelho Netto 《European journal of plant pathology / European Foundation for Plant Pathology》2006,115(1):95-103

New concepts in phytopathometry continue to emerge, such as the evolution of the concept of pathogen intensity versus the well-established concept of disease intensity. The concept of pathogen severity, defined as the quantitative measurement of the amount of pathogen per sampling unit has also emerged in response to the now commonplace development of quantitative molecular detection tools. Although the concept of disease severity, i.e., the amount of disease per sampling unit, is a well-established concept, the accuracy and precision of visual estimates of disease severity is often questioned. This article will review disease assessment concepts, as well as the methods and assessment aides currently available to improve the accuracy and precision of visually-based disease severity data. The accuracy and precision of visual disease severity assessments can be improved by quantitatively measuring and comparing the accuracy and precision of rates and/or assessment methods using linear regression, by using computer-based disease assessment training programmes, and by developing and using diagrammatic keys (standard area diagrams).  相似文献   

Amanita muscaria toxicosis in two dogs     

John H. Rossmeisl  Jr.  DVM  MS  DACVIM      Michael A. Higgins  DVM    Dennis J. Blodgett  DVM  PhD  DABVT    Matthew Ellis  DVM    Delbert E. Jones  MS 《Journal of Veterinary Emergency and Critical Care》2006,16(3):208-214

Objective: To report the manifestations, history, and pathophysiologic basis of disease in 2 dogs with Amanita muscaria toxicosis. Case summaries: Two dogs were evaluated for an acute onset of gastroenteritis and seizures. A. muscaria toxicosis was suspected in each dog after confirmation of environmental exposure and visualization of ingested mushrooms in vomitus. The diagnosis was confirmed following identification of toxic Amanita metabolites in the urine and serum of each dog. Administration of supportive and symptomatic therapies resulted in the complete recovery of each animal. Unique information provided: Ingestion of the mushroom, A. muscaria, by dogs can result in acute gastrointestinal distress that precedes a potentially life‐threatening central neurologic syndrome characterized by seizures, tremors, and somnolence. Central nervous system dysfunction results primarily from the actions of ibotenic acid and its decarboxylation product, muscimol, which are analogues of the neurotransmitters glutamate and γ‐aminobutyric acid (GABA), respectively. Identification of these toxins in the urine and serum of affected dogs using high‐performance liquid chromatography (HPLC) provides a definitive diagnosis.  相似文献   

Growth and development of Lilium longiflorum ‘Nellie White’ during bulb production under controlled environments : II. Effects of shifting day/night temperature regimes on scale bulblets     

S.H. Kim  C.E. Niedziela Jr.  P.V. Nelson  A.A. De Hertogh  W.H. Swallow  N.C. Mingis 《Scientia Horticulturae》2007

One-year old scale bulblets of Lilium longiflorum Thunb. ‘Nellie White’ (Easter lily) were grown for 107 days during growth period 1 (GP-1) in six growth chambers under constant day/night temperature regimes of 30/26, 26/22, 22/18, 18/14, 14/10 and 10/6 °C. Subsequently, half of the plants in each temperature regime were transferred to 18/14 °C and the other half continued at the six constant temperature regimes. Both groups of plants were grown for an additional 89 days in growth period 2 (GP-2). Continuous temperatures of 26/22, 26/22–22/18 and 26/22–18/14 °C produced the greatest increase in basal bulb fresh weight (the main planted bulb), basal bulb circumference and stem bulb fresh weight, respectively. However, shifting these optimal temperatures to 18/14 °C during GP-2 resulted in a lower increase in basal bulb fresh weight and circumference. The optimum range for stem bulb production was expanded to 30/26–14/10 °C by shifting to 18/14 °C. The greatest increase for basal root growth occurred at 14/10–10/6 °C and for stem root growth at 14/10 °C. The temperature shift did not affect either root type. Maximum increase for stem length was at 26/22 and 22/18 °C and for stem plus leaf weight at 14/10 °C under constant temperature regimes. Transferring the plants from 10/6 to 18/14 °C resulted in the greatest increase in stem length and from 10/6 and 14/10 to 18/14 °C in the greatest increase in stem plus leaf weight. The greatest increase in the number of leaves occurred at 26/22 and 10/6 °C, but this growth parameter was unaffected by shifting to 18/14 °C, indicating that leaf number was determined in GP-1. Bulbils developed only when bulbs at high GP-1 temperature regimes (30/26 and 26/22 °C) were transferred to 18/14 °C during GP-2. Lower temperatures tended to favor an increase in flower bud production under continuous temperature regimes, while shifting to 18/14 °C increased flower bud production after initially high and low temperatures. Meristem abortion was greatest at 30/26 °C followed by 26/22 °C, but was not affected by temperature shifts in GP- 2. Thus, it is concluded that the abortion was induced or initiated during GP-1.  相似文献