Partial resistance to Mycosphaerella pinodes in field pea

2001 ◽  
Vol 81 (3) ◽  
pp. 535-540 ◽  
Author(s):  
A. G. Xue ◽  
T. D. Warkentin
Keyword(s):  
Pisum Sativum ◽  
Key Words ◽  
Partial Resistance ◽  
Field Pea ◽  
Mycosphaerella Pinodes ◽  
Seed Infection ◽  
Low Area ◽  
Stem Infection ◽  
Progress Curve ◽  
Field Plots

The responses of 335 field pea lines originating from more than 30 countries to mycosphaerella blight caused by Mycosphaerella pinodes were evaluated in inoculated field plots in 1994 and 1995. Seven lines (Baccara, Carneval, Danto, Majoret, Miko, PI273605, and Yellowhead) with low area under the disease progress curve (AUDPC) scores were identified. These seven lines, along with the resistant check, Radley, and the susceptible check, 89–195, were further examined for components of partial resistance to the disease in 1996 and 1998. Components evaluated were leaf area with symptoms (LAS), stem area with symptoms (SAS), pod area with symptoms (PAS), and percent seed infection (SI). Differences among pea lines were found in all components. Compared with the susceptible check, Carneval had significantly lower LAS, PAS, and SI in both years and was considered partially resistant to leaf, pod, and seed infection; Danto had significantly lower LAS, SAS, and PAS and was partially resistant to leaf, stem, and pod infection; Yellowhead had significantly lower SAS, PAS, and SI and was partially resistant to stem, pod, and seed infection; Majoret had significantly lower LAS and SAS and was partially resistant to leaf and stem infection; Miko had significantly lower SAS and PAS and was partially resistant to stem and pod infection; PI273605 had significantly lower PAS and SI and was partially resistant to pod and seed infection; and Baccara and Radley had significantly lower SAS and were partially resistant to stem infection only. Plots of Baccara and Yellowhead inoculated with M. pinodes-infected stubble had 10 and 17% reduction in yield, respectively, compared with non-inoculated and fungicide-treated plots and, thus, were considered tolerant to the disease. The remaining lines had yield reductions of 30 to 49%. Key words: Mycosphaerella blight, Mycosphaerella pinodes, Pisum sativum, field pea, partial resistance, disease tolerance

Response of field pea cultivars to chlorothalonil in the control of mycosphaerella blight

2003 ◽  
Vol 83 (2) ◽  
pp. 313-318 ◽  
Author(s):  
A. G. Xue ◽  
J. Charest ◽  
C. G. Davidson ◽  
D. W. McAndrew ◽  
D. J. Bing ◽  
...  
Keyword(s):  
Pisum Sativum ◽  
Key Words ◽  
Disease Severity ◽  
Seed Weight ◽  
Field Pea ◽  
Yield Potential ◽  
Mycosphaerella Pinodes ◽  
Seed Infection ◽  
Fungicide Treatment ◽  
Disease Pressure

The efficacy of chlorothalonil in controlling mycosphaerella blight in field pea was evaluated from 1998 to 2000 using 10 cultivars representing different leaf types, market classes, seed sizes, plant heights, and maturities. Significant differences ( P < 0.05) were observed among cultivars in disease severity, yield, 1000-seed weight (TSW), and seed infection each year. Cultivar × fungicide treatment interactions for these parameters were not significant in any of the 3 yr. Under both chlorothalonil treated and untreated conditions, Radley was the most resistant, while Carrera and Keoma were equally the most susceptible cultivars. A higher efficacy of chlorothalonil treatments was observed in 1999 when disease severity was greater than in 1998 or 2000. On average, chlorothalonil treatments reduced disease severity significantly in 1999 and 2000, but not in 1998. Overall, the fungicide increased yield by 6.4%, and TSW by 0.9–5.1%, which were significant in 1998 and 1999, but not in 2000. Based on 2-yr assessments of seed infection by Mycosphaerella pinodes, chlorothalonil reduced seed infection by 19.2%, which was significant in 1999, but not in 2000. Chlorothalonil treatments provide a greater benefit in years when disease pressure and yield potential are high. Key words: Field pea, Pisum sativum, mycosphaerella blight, Mycosphaerella pinodes, chlorothalonil

Fungicidal control of ascochyta blight of field pea

1996 ◽  
Vol 76 (1) ◽  
pp. 67-71 ◽  
Author(s):  
T. D. Warkentin ◽  
K. Y. Rashid ◽  
A. G. Xue
Keyword(s):  
Pisum Sativum ◽  
Key Words ◽  
Untreated Control ◽  
Seed Weight ◽  
Ascochyta Blight ◽  
Field Pea ◽  
Mycosphaerella Pinodes ◽  
Yield Increase ◽  
Pisum Sativum L

The use of fungicides for the control of ascochyta blight in field pea was investigated. Four fungicides were applied to the cultivars AC Tamor and Radley at two locations in Manitoba in 1993 and 1994. Fungicides were applied either once, twice, or three times at 10-d intervals, beginning at the initiation of flowering. Chlorothalonil and benomyl were effective m reducing the severity of ascochyta blight and increasing the yield and seed weight of field pea. The triple application of chlorothalonil resulted in a mean yield increase of 33% over that of the untreated control. Iprodione and propiconazole were relatively ineffective in controlling ascochyta blight. The percentage of seedborne ascochyta was not significantly affected by fungicide treatments. The severity of ascochyta blight was greater in 1993 that in 1994, resulting in greater benefits of chlorothalonil and benomyl applications in 1993. Key words: Field pea, Pisum sativum L., ascochyta blight, Mycosphaerella pinodes, fungicide

Effects of timings of inoculation with Mycosphaerella pinodes on yield and seed infection of field pea

1997 ◽  
Vol 77 (4) ◽  
pp. 685-689 ◽  
Author(s):  
A. G. Xue ◽  
T. D. Warkentin ◽  
E. O. Kenaschuk
Keyword(s):  
Pisum Sativum ◽  
Seed Weight ◽  
Field Experiments ◽  
Control Program ◽  
Seed Transmission ◽  
Field Pea ◽  
Mycosphaerella Pinodes ◽  
Yield Reduction ◽  
Seed Infection ◽  
Flowering Stage

Inoculated field experiments were carried out in 1994 and 1995 to study the effect of the timing of inoculation with Mycosphaerella pinodes (Berk. & Bloxam) Vestergren on disease development, yield reduction and seed infection, in three field pea (Pisum sativum L.) cv. Bohatyr, cv. Scorpio and cv. Triumph. The greatest impact of inoculation on all disease and yield parameters was at the 8–10 node stage in 1994, and at the mid-flowering stage in 1995. The lowest impact of inoculation was at the pod swell stage for both years. When inoculated at 8–10 nodes, mid-flowering and pod swell stages, M. pinodes reduced yield by 31, 24 and 19%, respectively, in 1994 and 33, 43 and 30%, respectively, in 1995. The 1000-seed weight was not affected by the timing of inoculation; however, all inoculations reduced seed weight in both years. Plant-to-seed transmission of M. pinodes was affected by the timing of inoculation in 1994, but not in 1995. Results of this study suggest that prevention of early infection by M. pinodes will provide the best economic return in a mycosphaerella blight control program on field pea. Key words: Mycosphaerella blight, Mycosphaerella pinodes, field pea, Pisum sativum, yield reduction

Influence of agronomic traits on the expression of tissuespecific resistance to mycosphaerella blight in field pea

2007 ◽  
Vol 87 (1) ◽  
pp. 157-165 ◽  
Author(s):  
R. L. Conner ◽  
S. -F. Hwang ◽  
S. M. Woods ◽  
K. F. Chang ◽  
D. J. Bing ◽  
...  
Keyword(s):  
Pisum Sativum ◽  
Disease Severity ◽  
Agronomic Traits ◽  
Field Pea ◽  
Mycosphaerella Pinodes ◽  
Disease Development ◽  
Progress Curve ◽  
Late Maturity ◽  
Selection For ◽  
Crop Maturity

Mycosphaerella blight, caused by Mycosphaerella pinodes, is the most destructive disease of field pea (Pisum sativum L.) in western Canada. A 3-yr field study conducted at two field locations examined the effect of differences in lodging, growth stage and maturity on disease development among field pea cultivars that possess different forms of partial resistance. Significant differences in disease development, measured as area under the disease progress curve (AUDPC), and as disease severity on the leaves, stems and pods were observed among the field pea cultivars. These measurements of disease development were only influenced by differences in crop maturity in 2005. Only cultivars that were either intermediate or late maturing had low disease severity ratings or AUDPC values. Differences in the degree of lodging had a small inconsistent effect on the mycosphaerella blight ratings. These results suggest that differences in maturity should be considered in order to avoid inadvertent selection for late maturity while evaluating field pea lines or cultivars for mycosphaerella blight resistance. Key words: Mycosphaerella pinodes, field pea, Pisum sativum, maturity, lodging.

Proximate and mineral composition of field peas

1997 ◽  
Vol 77 (1) ◽  
pp. 101-103 ◽  
Author(s):  
T. D. Warkentin ◽  
A. G. Sloan ◽  
S. T. Ali-Khan
Keyword(s):  
Pisum Sativum ◽  
Key Words ◽  
Mineral Composition ◽  
Seed Yield ◽  
Total Protein ◽  
Field Pea ◽  
Pisum Sativum L ◽  
Field Peas ◽  
Pea Seeds ◽  
Proximate And Mineral Composition

Field pea seeds from 10 cultivars grown at two locations in Manitoba in 1986 and 1987 were analyzed for proximate and mineral profiles. Cultivars differed significantly in their level of total protein, crude fat, ADF, and all minerals tested. However, differences were not extremely large and were comparable to European reports. Location-year also had a significant effect on the levels of total protein, ADF, and all minerals tested. In most cases, the warmest location-year produced relatively higher levels of minerals, ash, and total protein, and lower seed yield than the coolest location-year. Key words: Field pea, Pisum sativum L., mineral

Field assessment of partial resistance to mycosphaerella blight in Pisum subspecies accessions

2012 ◽  
Vol 92 (2) ◽  
pp. 289-296 ◽  
Author(s):  
R. L. Conner ◽  
B. D. Gossen ◽  
S. F. Hwang ◽  
K. F. Chang ◽  
K. B. McRae ◽  
...  
Keyword(s):  
Partial Resistance ◽  
Field Trials ◽  
Field Pea ◽  
Mycosphaerella Pinodes ◽  
Detached Leaf ◽  
High Severity ◽  
Field Assessment ◽  
Ascochyta Pinodes ◽  
The Mean ◽  
Production Areas

Conner, R. L., Gossen, B. D., Hwang, S. F., Chang, K. F., McRae, K. B. and Penner, W. C. 2012. Field assessment of partial resistance to mycosphaerella blight in Pisum subspecies accessions. Can. J. Plant Sci. 92: 289–296. Mycosphaerella blight, caused by Mycosphaerella pinodes (Berk. & Bloxam) Vestergr., the teleomorph of Ascochyta pinodes Jones, is an important foliar disease of field pea in the major production areas of the world. Partial resistance to mycosphaerella blight has been reported in some field pea cultivars, but, at best, they are only moderately susceptible. A 3-yr field study was conducted to evaluate the mycosphaerella blight reactions of 28 accessions from a number of subspecies of Pisum sativum L. and one accession of P. fulvum Sibth. A few of the accessions carried mutations for the genes af, tl, and st that affect the morphology of the leaflets, stipules and tendrils. Reactions to mycosphaerella blight were characterized based on the mean of the severity ratings taken on the two final assessment dates before the crop matured and also on the change in mycosphaerella blight severity between these two dates. In many of the accessions, severity ratings were similar to that of the moderately susceptible check cultivar, CDC Peko, while a few had high severity ratings similar to those of the susceptible check cultivars. The accession PI 512079, which has small stipules, branched petioles with many leaflets but no tendrils, had the lowest ratings for mycosphaerella blight severity. Four other accessions exhibited the smallest change in mycosphaerella blight severity at the end of the growing season. Differences in leaf morphology likely influenced the change in disease severity, since all the semi-leafless and leafless accessions had smaller changes in mycosphaerella blight severity than the susceptible check cultivars. In a detached leaf assay with two isolates of Mycosphaerella pinodes (Berk. & Bloxam) Vestergr., the smallest lesions formed on PI 512079, but otherwise the results failed to show a relationship with the observed severity values in the field trials.

Importance of seed-borne inoculum in the etiology of the Ascochyta blight complex of field peas (Pisum sativum L.) grown in Victoria

1995 ◽  
Vol 35 (4) ◽  
pp. 525 ◽  
Author(s):  
TW Bretag ◽  
TV Price ◽  
PJ Keane
Keyword(s):  
Pisum Sativum ◽  
Ascochyta Blight ◽  
Mycosphaerella Pinodes ◽  
Seed Infection ◽  
Seeding Rate ◽  
Pisum Sativum L ◽  
Field Peas ◽  
Ascochyta Pisi ◽  
Growing Region ◽  
Seed Infestation

Fungi associated with the ascochyta blight complex of field peas were isolated from 436 of 691 seedlots tested. Of the fungi detected, 94.8% of isolates were Mycosphaerella pinodes, 4.2% Phoma medicaginis, and 1.0% Ascochyta pisi. The levels of infestation of seed varied considerably from year to year and between seedlots, depending on the amount of rainfall between flowering and maturity. Within a particular pea-growing region, the level of seed-borne infection was often highest in seed from crops harvested latest. In addition, crops sown early were usually more severely affected by disease than late-sown crops, and this resulted in higher levels of seed infection. There was no correlation between the level of seed infestation by M. pinodes and the severity of ascochyta blight; however, where the level of seed infection was high (>11%) there was a significant reduction in emergence, which caused a reduction in grain yield. It may therefore be possible to use seed with high levels of seed-borne ascochyta blight fungi, provided the seeding rate is increased to compensate for poor emergence.

AAC Asher field pea

2020 ◽  
Author(s):  
Dengjin Bing ◽  
Don Beauchesne ◽  
Debra L. McLaren ◽  
Richard Cuthbert ◽  
Hamid Naeem
Keyword(s):  
Powdery Mildew ◽  
Pisum Sativum ◽  
Seed Weight ◽  
Field Pea ◽  
Mycosphaerella Pinodes ◽  
Western Canada ◽  
Erysiphe Pisi ◽  
Lodging Resistance ◽  
Pisum Sativum L ◽  
Thousand Seed Weight

AAC Asher is a semi-leafless, medium to large seeded yellow cotyledon field pea (Pisum sativum L.) variety developed at Agriculture and Agri-Food Canada, Lacombe Research and Development Centre, Lacombe, Alberta, Canada. It has high yielding potential, early to medium maturity and good lodging resistance. AAC Asher has maturity of 94 days, and one-thousand-seed weight of 257 g. AAC Asher is resistant to powdery mildew (caused by Erysiphe pisi Syd.), moderately tolerant to mycosphaerella blight (caused by Mycosphaerella pinodes) and fusarium wilt (caused by Fusarium oxysporum). AAC Asher is adapted to all field growing regions in western Canada.

Seed hull content in field pea

1993 ◽  
Vol 73 (2) ◽  
pp. 611-613 ◽  
Author(s):  
S. T. Ali-Khan
Keyword(s):  
Pisum Sativum ◽  
Key Words ◽  
Seed Size ◽  
Fiber Content ◽  
Field Pea ◽  
Hull Content ◽  
Seed Hull ◽  
Hull Fiber

Seed hull content in field pea was used as a measure of estimating fiber content. Screening of field pea cultivars and germplasm showed a range of 7.2–12% in seed hull content. There was a significant effect of growing sites and years on hull %. No significant correlation was detected between hull % and yield, maturity or seed size but cultivars containing high hull % produced purée with poor viscosity. Key words: Field pea, Pisum sativum, seed hull, fiber

Agassiz field pea

2006 ◽  
Vol 86 (4) ◽  
pp. 1167-1169 ◽  
Author(s):  
Deng-Jin Bing ◽  
Don Beauchesne ◽  
Al Sloan ◽  
Robert Conner ◽  
Yantai Gan ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Pisum Sativum ◽  
Key Words ◽  
Field Pea ◽  
Western Canada ◽  
Seed Shape ◽  
Lodging Resistance ◽  
Pisum Sativum L ◽  
Cultivar Description ◽  
Round Seed

Agassiz is a semi-leafless and powdery mildew resistant field pea (Pisum sativum L.) cultivar with yellow cotyledons, high seed yielding ability, good lodging resistance, round seed shape and medium seed size. It is adapted to field pea growing regions in western Canada. Key words: Field pea, Pisum sativum, cultivar description, yellow cotyledons

Sign in / Sign up

Export Citation Format

Share Document