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You searched for: Journal name Canadian journal of plant pathology Remove constraint Journal name: Canadian journal of plant pathology Publication year rev 8003-1997 Remove constraint Publication year rev: 8003-1997 Source 1997 v.19 no.2 Remove constraint Source: 1997 v.19 no.2
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1. Colonization of weeds in Phomopsis longicolla

Author:
Roy, K.W.; Ratnayake, S.; McLean, K.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 193-196
ISSN:
0706-0661
Subject:
Glycine max; Xanthium strumarium; Ambrosia trifida; weed hosts; inoculum; pathogenicity; plant pathogenic fungi; Euphorbia maculata; Rumex crispus; colonizing ability; Diaporthe
Abstract:
... Isolates of Phomopsis longicolla were recovered from surface-disinfested leaves and stems of giant ragweed (Ambrosia trifida), cocklebur (Xanthium strumarium), spotted spurge (Euphorbia maculata), and curly dock (Rumex crispus). The highest and average frequencies of isolation of P. longicolla from leaves and stems of weeds ranged from 4% to 24% and 1 to 6%, respectively. Isolates from weeds were ...
DOI:
10.1080/07060669709500553

2. Comparative studies of inhibitory activities of chalcones on tomato ringspot virus (ToRSV)

Author:
Onyilagha, J.C.; Malhotra, B.; Elder, M.; French, C.J.; Towers, G.H.N.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 133-137
ISSN:
0706-0661
Subject:
Tomato ringspot virus; antiviral agents; chalcones; Chenopodium quinoa; induced resistance; disease resistance; pathogenicity; antiviral properties
Abstract:
... Twenty-one chalcones were investigated and compared at a concentration of 5 micrograms mL-1 for activity against tomato ringspot nepovirus (ToRSV) infectivity. Although several individual compounds showed anti-viral activity, it was not possible to identify the best group of chalcones for virus inhibition. The most effective inhibitory compounds were A1 (2',3',4',4-tetrahydroxychalcone) (69% inhib ...
DOI:
10.1080/07060669709500541

3. Effect of necrotic and non-necrotic strains of bean common mosaic and bean yellow mosaic virus on nodulation and root tip necrosis of bean (Phaseolus vulgaris)

Author:
Tu, J.C.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 156-160
ISSN:
0706-0661
Subject:
Phaseolus vulgaris; root tips; necrosis; nodulation; age; Bean common mosaic virus; Bean yellow mosaic virus; strain differences; environmental factors; air temperature
Abstract:
... Nodulation of beans (Phaseolus vulgaris) decreased as a result of infection by bean common mosaic virus (BCMV) and bean yellow mosaic virus (BYMV). Nodulation decreased progressively in infected plants as the plants aged. There was a greater decrease in nodulation in BCMV infected cv. Sanilac plants than in BYMV infected cv. Black Turtle Soup plants. This difference corresponded with symptom sever ...
DOI:
10.1080/07060669709500545

4. Evaluation of mosaic symptom expression as an indirect measure of the incidence of PVY(0) in potato cv. Shepody

Author:
Sturz, A.V.; Diamond, J.F.; Stewart, J.G.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 145-148
ISSN:
0706-0661
Subject:
Solanum tuberosum; enzyme-linked immunosorbent assay; Potato virus Y; incidence; detection; Prince Edward Island
Abstract:
... Mosaic symptom expression in potato (Solanum tuberosum), although caused by several viruses alone or in combination, is often used as an indirect measure of the level of PVY(O) present within specific generations under field conditions. From 1993 to 1995, a program of visual inspection for mosaic symptoms and concurrent enzyme-linked immunosorbent assay (ELISA) testing for PVY(O) was used to deter ...
DOI:
10.1080/07060669709500543

5. Evolution of lentil diseases over 25 years in western Canada

Author:
Morrall, R.A.A.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 197-207
ISSN:
0706-0661
Subject:
history; genetic resistance; Botrytis cinerea; disease prevalence; fungal diseases of plants; Didymella; disease control; crop yield; plant pathogenic fungi; Ascochyta fabae; disease resistance; Ascochyta lentis; Colletotrichum truncatum; Lens culinaris; virulence; Canada
Abstract:
... Lentil was first grown in Canada in 1969 and was relatively disease-free until 1978. By 1996 the crop occupied 300 000 ha annually. It is affected by three major diseases, ascochyta blight, anthracnose, and botrytis stem and pod rot. Ascochyta blight was reported in Saskatchewan in 1978; it causes major yield losses and seed discoloration, which is increased by late maturity and the practice of sw ...
DOI:
10.1080/07060669709500554

6. Fractification of Chondrostereum purpureum on hardwoods inocated for biological control

Author:
Wall, R.E.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 181-184
ISSN:
0706-0661
Subject:
brush control; Acer pensylvanicum; spore dispersal; plant pathogenic fungi; Acer saccharum; biological control agents; risk assessment; mycoherbicides; Alnus rubra; Acer rubrum; Betula alleghaniensis; Fagus grandifolia; adverse effects; Chondrostereum purpureum; inoculum; hardwood; Betula papyrifera; environmental factors; Prunus pensylvanica; Populus tremuloides; New Brunswick; British Columbia
Abstract:
... Cut stump and stem frill treatments of hardwoods with Chondrostereum purpureum in New Brunswick and British Columbia were examined periodically for several years after inoculation for fructifications of the fungus. In New Brunswick, fructifications occurred on all inoculated hardwood species (Acer rubrum, A. pensylvanicum, A. saccharum, Betula alleghaniensis, B. papyrifera, Fagus grandifolia, Popu ...
DOI:
10.1080/07060669709500550

7. Frequency of occurrence of Fusarium pallidoroseum, effects on seeds and seedlings, and associations with other fungi in soybean seeds and pods

Author:
Roy, K.W.; Ratnayake, S.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 188-192
ISSN:
0706-0661
Subject:
seed germination; Glycine max; seeds; seedlings; fungal diseases of plants; Fusarium incarnatum; Diaporthe longicolla; plant pathogenic fungi; seedling emergence; seed quality; disease surveys; incidence; virulence; infection; pods; Mississippi
Abstract:
... Fusarium pallidoroseum (syn. F. semitectum) was isolated from surface-disinfested soybean seeds and pods from fields throughout Mississippi. The mean percentage recovery was higher from pods (16.9%) than from seeds (7.2%), although incidence on seeds exceeded 50% in one field. Colonization of pods was positively correlated with frequency of infection of seeds. The frequency of isolation of F. pall ...
DOI:
10.1080/07060669709500552

8. Inter- and intranational spread of ascochyta pathogens of chickpea, faba bean, and lentil

Author:
Kaiser, W.J.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 215-224
ISSN:
0706-0661
Subject:
Cicer arietinum; Lens culinaris; Vicia faba; Ascochyta fabae; Ascochyta rabiei; Didymella; seeds; geographical distribution; seed-borne fungi; epidemiology; seed pathology; germplasm; fungal diseases of plants; Ascochyta lentis
Abstract:
... Ascochyta blights of chickpea, faba bean, and lentil are caused by Ascochyta rabiei, A. fabae, and A. fabae f. sp. lentis, respectively, all of which are important seedborne pathogens. Infected seed is important in the long-distance spread and survival of these pathogens. In the last 20-25 years, there has been a steady increase in the exchange of germplasm of cool season food legumes between coun ...
DOI:
10.1080/07060669709500556

9. Stem rusts on wheat, barley, and oat in Canada in 1995

Author:
Harder, D.E.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 171-175
ISSN:
0706-0661
Subject:
rust diseases; cultivars; races; Hordeum vulgare; disease prevalence; Puccinia graminis; varietal resistance; crop yield; Triticum aestivum; Avena sativa; disease resistance; genes; disease surveys; incidence; virulence; infection; Canada
Abstract:
... In 1995, stem rusts of wheat and barley [Puccinia graminis f. sp. tritici] and oat [P. graminis f. sp. avenae] were light in eastern Canada, and in western Canada were confined mainly to the Red River Valley of Manitoba. Maximum severities of 20% developed in lines of susceptible wheat in nurseries, and there were no infections in commercial wheat fields. In some late-sown barley fields in Manitob ...
DOI:
10.1080/07060669709500548

10. Antimycotic activity of Xenorhabdus bovienii (Enterobacteriaceae) metabolites against Phytophthora infestans on potato plants

Author:
Ng, K.K.; Webster, J.M.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 125-132
ISSN:
0706-0661
Subject:
Solanum tuberosum; Phytophthora infestans; biological control agents; Xenorhabdus; entomopathogenic bacteria; secondary metabolites; antifungal properties; plant pathogenic fungi; Pythium ultimum; Thanatephorus cucumeris; foliar spraying; phytotoxicity; crop damage; disease control; plant diseases and disorders; application rate
Abstract:
... Soluble organic metabolites produced by phase one of Xenorhabdus bovienii strain A2 were tested for their antimycotic activity against selected plant pathogenic fungi and for their phytotoxicity. The metabolites were extracted with ethyl acetate from the supernatant of 96-h-old X. bovienii cultures in tryptic soy broth. They were fungicidal to Phytophthora infestans at 0.1 mg/mL on rye agar but on ...
DOI:
10.1080/07060669709500540

11. Automatic pipettor for inoculation of maize kernels for evaluation of resistance to Fusarium graminearum

Author:
Reid, L.M.; Hamilton, R.I.; Schaafsma, A.W.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 185-187
ISSN:
0706-0661
Subject:
Fusarium graminearum; Zea mays; seeds; laboratory techniques; seed inoculation; corn; plant pathogenic fungi; disease resistance; screening
Abstract:
... To increase the efficiency of inoculating maize ears with Fusarium graminearum, a Jet-Pipet repetitive dispenser was modified to inject a macroconidial suspension into 3-4 kernels. The method has all of the advantages of a pin-bar technique currently used, in addition to being more rapid, using less conidial suspension, reducing exposure of the user to the suspension, and being easier to adjust fo ...
DOI:
10.1080/07060669709500551

12. Cereal smuts in Manitoba and Saskatchewan, 1989-95

Author:
Thomas, P.L.; Menzies, J.G.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 161-165
ISSN:
0706-0661
Subject:
crop yield; fungicide resistance; plant pathogenic fungi; genes; Ustilago segetum var. nuda; Hordeum vulgare; fungal diseases of plants; disease severity; disease resistance; Ustilago segetum var. avenae; incidence; virulence; cultivars; varietal resistance; grains; Avena sativa; disease surveys; Triticum; Saskatchewan; Manitoba
Abstract:
... Grain yield losses due to the smuts are currently controlled by the application of fungicides to seed and by the use of resistant cultivars. It is important to monitor the natural populations of the six species of cereal smut that affect barley, oat, and wheat to ensure early detection of resistance to fungicides and potentially threatening changes in virulence. Surveys were conducted in farm fiel ...
DOI:
10.1080/07060669709500546

13. Coat protein and 5' nontranslated region of a variant of potato virus Y

Author:
McDonald, J.G.; Wong, E.; Henning, D.; Tao, T.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 138-144
ISSN:
0706-0661
Subject:
coat proteins; sequence alignment; phylogeny; amino acid sequences; nucleotide sequences; Potato virus Y; strains; sequence homology
Abstract:
... A monoclonal antibody was produced that reacted specifically with two isolates, I-136 and I-L56, of PVY that share properties with members of both the PVY(N) and PVY(O) strain groups. There was negligible reaction of this antibody with a diverse collection of 17 other PVY isolates. The nucleotide sequence of the coat protein coding region of the I-136 isolate was determined and the amino acid sequ ...
DOI:
10.1080/07060669709500542

14. Effects of rain on splash dispersal of fungal pathogens

Author:
Madden, L.V.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 225-230
ISSN:
0706-0661
Subject:
Fragaria ananassa; plant pathogenic fungi; Phytophthora cactorum; Colletotrichum acutatum; epidemiology; rain; inoculum; spore dispersal; fungal spores; fungal diseases of plants
Abstract:
... Dispersal of fungal plant pathogens by rain splash or wind is the critical component in epidemic development of many diseases. Yet, splash dispersal has been infrequently studied compared to wind dispersal, until recently. Over the past 12 years, we have studied the splash dispersal of Phytophthora cactorum and Colletotrichum acutatum at three hierarchical levels: splash from single water-drop imp ...
DOI:
10.1080/07060669709500557

15. Incidence and virulence of Puccinia coronata f.sp. avenae in Canada in 1995

Author:
Chong, J.; Seaman, W.L.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 176-180
ISSN:
0706-0661
Subject:
rust diseases; Avena fatua; cultivars; Puccinia coronata; phenotype; disease prevalence; varietal resistance; genes; Avena sativa; disease resistance; disease surveys; incidence; virulence; infection; Manitoba; Ontario; Saskatchewan
Abstract:
... In 1995, traces of crown rust [Puccinia coronata f. sp. avenae] infections were first observed in a commercial oat (Avena sativa) field in southern Manitoba during the last week of June. Subsequent hot, dry weather slowed development of the fungus and kept infections light in oat fields in the Red River Valley throughout the growing season. Using 18 oat differential lines, each with a different ge ...
DOI:
10.1080/07060669709500549

16. Legume virus research in Canada: a retrospective and a view of the future

Author:
Hamilton, R.I.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 208-214
ISSN:
0706-0661
Subject:
plant viruses; Melilotus; history; Glycine max; agricultural research; Medicago sativa; Phaseolus vulgaris; Pisum sativum; Canada
Abstract:
... Since 1970, approximately 100 research papers have been published in refereed scientific journals on viruses infecting legumes (primarily alfalfa, bean, pea, soybean, and sweetclover) in Canada. Seventy-three percent of this research was done in university laboratories (Alberta, British Columbia, Manitoba, McGill, Toronto, and Western Ontario) and the remainder was done by the Research Branch of A ...
DOI:
10.1080/07060669709500555

17. Physiologic specialization of Puccinia recondita f.sp. tritici in Canada in 1995

Author:
Kolmer, J.A.; Liu, J.Q.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 166-170
ISSN:
0706-0661
Subject:
phenotype; disease prevalence; Puccinia recondita; environmental factors; varietal resistance; Triticum aestivum; disease resistance; genes; disease surveys; incidence; virulence; infection; Manitoba; Saskatchewan
Abstract:
... In 1995 leaf rust of wheat (Triticum aestivum L.) caused by Puccinia recondita f. sp. tritici was first observed on June 16 in winter wheat fields in southern Manitoba. Warm summer temperatures with frequent dew periods favoured spread of the disease in spring wheat fields throughout southern Manitoba in 1995. High levels of infection were found on wheat cultivars that had only resistance gene Lr1 ...
DOI:
10.1080/07060669709500547

18. Potato virus Y detection: sensitivity of RT-PCR depends on the size of fragment amplified

Author:
Singh, M.; Singh, R.P.
Source:
Canadian journal of plant pathology 1997 v.19 no.2 pp. 149-155
ISSN:
0706-0661
Subject:
Potato virus Y; detection; reverse transcription; polymerase chain reaction; RNA; nucleotide sequences
Abstract:
... The sensitivity with which reverse-transcription polymerase chain reaction (RT-PCR) detects the sequences of different sizes from the genome of the common strain of potato virus Y (PVY(O)) was investigated. Products of 1040, 690, 412, and 217 bp encoding sequences from the 5'-end and products of 1016, 704, 388, and 249 bp encoding sequences from the 3'-end of the PVY(O) genome were amplified. With ...
DOI:
10.1080/07060669709500544