The Plant Pathology Laboratory, Harpenden

Nature ◽  
1960 ◽  
Vol 187 (4731) ◽  
pp. 21-23
Author(s):  
W. C. MOORE
Keyword(s):  
Plant Pathology ◽  
Pathology Laboratory

A New Black Raspberry Aphid

1954 ◽  
Vol 86 (5) ◽  
pp. 235-236 ◽  
Author(s):  
George F. Knowlton
Keyword(s):  
Plant Pathology ◽  
Black Raspberry ◽  
Pathology Laboratory ◽  
Rubus Occidentalis ◽  
Leaf Symptoms

An apparently undescribed Amphorophora was received from Richard Stace-Smith of the Canada Agriculture Plant Pathology Laboratory, Vancouver, B.C., Canada. This species produced leaf symptoms on Munger black raspberry, Rubus occidentalis, which differed from anything associated with the feeding of Amphorophora rubi (Kaltenbach). An examination was made of the material by Professor M. A. Palmer, Dr. F. C. Hottes and the writer. This failed to place this blackberry aphid as a described species. Therefore, it is here described as new.

scholarly journals William Pollock Fraser (1867-1943) : Canadian pioneer plant pathologist-mycologist

2005 ◽  
Vol 73 (2) ◽  
pp. 53-59
Author(s):  
R.H. Estey
Keyword(s):  
Plant Pathology ◽  
Nova Scotia ◽  
Rust Fungi ◽  
Western Canada ◽  
Forest Pathology ◽  
Pathology Laboratory ◽  
Pioneer Plant ◽  
Mcgill University ◽  
The University ◽  
Wheat Rust

William P. Fraser, the first Canadian-born plant pathologist-mycologist to be internationally recognized as such, began as an amateur collector of fungi, with emphasis on the plant rusts, while teaching school in his home province, Nova Scotia. He then became a widely acclaimed authority on the rusts and a professional plant pathologist-mycologist. He taught plant pathology and mycology, first at McGill University and then, after an interval as head of the first plant pathology laboratory in Western Canada, at the University of Saskatchewan. Fraser was a Canadian pioneer in research on physiological races of wheat rust; in the culture of heteroecious rust fungi, in forest pathology, and in the study of root and smut diseases of grasses in Western Canada.

Virulence analysis of Pyricularia oryzae isolates causing wheat blast in Bangladesh

2021 ◽  
Vol 30 (2) ◽  
pp. 151-157
Author(s):  
Md Abdullah Al Noman ◽  
Shamim Shamsi
Keyword(s):  
Plant Pathology ◽  
Plant Pathogen ◽  
Pyricularia Oryzae ◽  
Causal Agent ◽  
Pathology Laboratory ◽  
Wheat Varieties ◽  
Pathogenic Potential ◽  
Wheat Blast ◽  
Virulence Analysis ◽  
High Virulence

Mycology and Plant Pathology Laboratory, Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh Pyricularia oryzae pathotype Triticum, causal agent of wheat blast, has emerged in Bangladesh as a serious threat for wheat production. Virulence analysis of plant pathogen can reveal the pathogenic nature of that pathogen. In the present study, twenty-four monoconidial isolates of P. oryzae from Chuadanga, Meherpur, Kustia and Jhenaidaha districts of Bangladesh were analyzed to observe their pathogenic potential. Based on the disease reactions, all the isolates were grouped into 3 pathotypes. Present investigation revealed that the isolates with high virulence were prevalent in the studied P. oryzae population. Again, Pathotype 1 that was identified as the most virulent can be used as reference for screening resistant wheat varieties. Dhaka Univ. J. Biol. Sci. 30(2): 151-157, 2021 (July)

scholarly journals First Report of Leaf and Stem Rust Caused by Puccinia sherardiana on Sphaeralcea grossulariaefolia in North America and S. munroana in Wyoming

Plant Disease ◽  
1998 ◽  
Vol 82 (7) ◽  
pp. 831-831
Author(s):  
S. C. Briere ◽  
G. D. Franc
Keyword(s):  
United States ◽  
Plant Pathology ◽  
Relative Humidity ◽  
Plant Material ◽  
The United States ◽  
Diseased Plant ◽  
Pathology Laboratory ◽  
Natural Lighting ◽  
Foliar Symptoms ◽  
Plastic Bags

Diseased samples of globe mallow, Sphaeralcea grossulariaefolia and S. munroana, were submitted by an ornamental seed producer in Wyoming to our Extension Plant Pathology Laboratory in July 1997. Dark brown, amphigenous telia surrounded by chlorotic halos were present on both foliage and stems. Mean teliospore dimensions observed were 30.8 × 44.8 μm. The teliospores germinated readily on water agar at 20°C and formed basidiospores within 24 h. Aecia and uredinia were not found. Based on characteristics mentioned above, this fungus was identified as Puccinia sherardiana Körn (1). This microcyclic rust was previously described on 12 other Sphaeralcea spp. plus other plant species in the Malvaceae family (1,2). Stem and foliar symptoms were reproduced in a greenhouse on 8-week-old plants of S. grossulariaefolia and S. munroana. These plants were inoculated with teliospores removed from the original diseased plant material. Immediately after inoculation, plants were misted and placed in plastic bags and incubated for 36 h at 100% relative humidity and 20°C. Plants continued growth with natural lighting and with day and night temperatures of 20 and 15°C, respectively. Symptoms developed within 12 days with initial telia rupturing the host epidermis 13 days after inoculation. Telia were examined microscopically to complete Koch's postulates. References: (1) J. C. Arthur. Manual of Plant Rusts in United States and Canada. Hafner Pub., 1962. (2) D. F. Farr et al. Fungi on Plants and Plant Products in the United States. American Phytopatholical Society, St. Paul, MN, 1989.

scholarly journals Progress and Prospect of Training on the Health and Quality of Seeds in Bangladesh

2013 ◽  
Vol 5 (2) ◽  
pp. 307-313
Author(s):  
AQMB Rashid ◽  
P Dey ◽  
A Sultana
Keyword(s):  
Plant Pathology ◽  
Pathology Laboratory ◽  
Knowledge And Skills ◽  
Seed Technology ◽  
Seed Pathology ◽  
Seed Health ◽  
Training Courses ◽  
Training Programmes ◽  
Graduate Certificate

Training on seed health was first initiated at the Seed Pathology Laboratory in the Department of Plant Pathology, BAU in 1880s. Farmers Block Supervisors and Subject Matter Specialists of DAE, Scientific Officers from SCA and Seed Wing Officers of BADC received the training. A total of 51 training programmes were conducted during the year 1988-2012 where 1003 trainees have been trained. The durations of the training courses ranged from one day to three months depending on the category of trainees. From 2006 to 2010 SPC organized training of six batches for the Post Graduate Certificate courses based on Seed Technology integrated with Seed Pathology. Through training programmes the knowledge and skills of the trainees were evaluated and found eventually changing their attitudes as regards to the health and quality of crop seeds.DOI: http://dx.doi.org/10.3329/jesnr.v5i2.14835 J. Environ. Sci. & Natural Resources, 5(2): 307-313 2012

A New Species of Aphid From Rubus parviflorus Nutt.

1958 ◽  
Vol 90 (11) ◽  
pp. 672-674 ◽  
Author(s):  
Alex R. Hill
Keyword(s):  
British Columbia ◽  
Plant Pathology ◽  
New Species ◽  
Department Of Agriculture ◽  
Pathology Laboratory ◽  
Canada Department ◽  
Morphological Differences ◽  
A New Species

Through the kindness of Dr. R. Stace-Smith of the Canada Department of Agriculture, Plant Pathology Laboratory, Vancouver, B.C., I have been able to collect and examine specimens of a species of Amphorophora occurring on Thimbleberry (Rubus parviflorus) in British Columbia. This species, as well as showing morphological differences which separate it from all described species, differs also from them ecologically and in its ability to transmit certain Rubus viruses. (Stace-Smith, in press). Professors M. A. Palmer and George F. Knowlton have both seen some of this material and have given it as their opinion that it cannot be placed among the known species of Amphorophora. It is therefore described here as a new species.

Technical notes on routine TEM procedures

1987 ◽  
Vol 45 ◽  
pp. 630-631
Author(s):  
K. Chien ◽  
R.L. Van de Velde ◽  
R.C. Heusser
Keyword(s):  
Epoxy Resins ◽  
Pathology Laboratory ◽  
Silicone Fluid ◽  
Image Position

Sectioning quality of epoxy resins can be improved by the addition of a 1% silicone 200 fluid (Dow Corning), however this produces a softer block. To compensate, a harder plastic has been used for embedding various tissues encountered in our pathology laboratory. Exact amounts of the plastic mixture can be directly made up for embedding as shown: The chart reveals a Poly/Bed 812 (WPE 145) to anhydride ratio of 1:0.7 and a NMA to DDSA ratio of 7:3. 1% silicone fluid is added to above mixtures.Due to impurities within the DDSA and NMA, the polymerized epoxy blocks vary in darkness and appear to affect sectioning quality. After discussing this problem with Polysciences Inc., they have agreed to purify their anhydrides in an effort to standardize the consistency of the plastic.

Plant Pathology Diagnosed by X-Ray Microanalysis

1987 ◽  
Vol 45 ◽  
pp. 974-975
Author(s):  
J. H. Resau ◽  
N. Howell ◽  
S. H. Chang
Keyword(s):  
Electron Microscopy ◽  
Plant Pathology ◽  
Biochemical Characterization ◽  
Nutrient Deficiency ◽  
Green Leaf ◽  
Parasitic Infestation ◽  
X Ray

Spinach grown in Texas developed “yellow spotting” on the peripheral portions of the leaves. The exact cause of the discoloration could not be determined as there was no evidence of viral or parasitic infestation of the plants and biochemical characterization of the plants did not indicate any significant differences between the yellow and green leaf portions of the spinach. The present study was undertaken using electron microscopy (EM) to determine if a micro-nutrient deficiency was the cause for the discoloration.Green leaf spinach was collected from the field and sent by express mail to the EM laboratory. The yellow and equivalent green portions of the leaves were isolated and dried in a Denton evaporator at 10-5 Torr for 24 hrs. The leaf specimens were then examined using a JEOL 100 CX analytical microscope. TEM specimens were prepared according to the methods of Trump et al.

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