scholarly journals Comparison Of 4 Varieties Of Spring Wheat For Resistance To Russian Wheat Aphid And Hessian Fly

1997 ◽  
Vol 22 (1) ◽  
pp. 435-435
Author(s):  
D.E Bragg
Keyword(s):  
Spring Wheat ◽  
Russian Wheat Aphid ◽  
Hessian Fly ◽  
Yield Data ◽  
Plant Materials ◽  
Harvest Data ◽  
Western Regional

Abstract Four Varieties of spring wheat (Alpowa, Centennial, ID488, and Wakanz) were seeded in a RCBD of 4 15 X 354 ft replicates per variety at the USDA-ARS Western Regional Plant Materials Introduction Center at Central Ferry, WA, on 6 May. Varieties were evaluated at 65 DAE (Feeks scale 10.5) for heads/ 10 plants, tiller/10 plants, % HF infested tillers, % RWA infested tillers, and % DR parasitized RWA. Harvest data was collected 9 Aug by cutting a 15 ft strip per replicate and weighing the grain on weight pads. Yield data per acre were calculated for each replicate. Data were subjected to ANOVA/LSD at P = 0.05.

scholarly journals Control of Hessian Fly and Russian Wheat Aphid in Spring Wheat, 1996B

1997 ◽  
Vol 22 (1) ◽  
pp. 335-335
Author(s):  
D. E. Bragg
Keyword(s):  
Spring Wheat ◽  
Russian Wheat Aphid ◽  
Hessian Fly ◽  
Seed Treatments ◽  
Untreated Check ◽  
Harvest Data ◽  
Plant Emergence ◽  
Set Up

Abstract Plots were seeded 14 Apr (60 lb/acre) at the Dye Farm near Pomeroy, WA. Two rates of Gaucho 480 (0.5, and 1.0 oz(AI)/cwt) were applied as seed treatments, and an untreated check was set up. Plots were arranged in a RCB design with 4 replicates of 36 X 400 ft each. Numbers of heads and tillers per 10 plants, % HF-infested tillers, and % RWA-infested tillers were recorded at 85 days after plant emergence (DAE) (Feeks scale 10.5). Harvest data were collected on 21 Aug by cutting 24 ft strips per replicate and weighing the grain in a weigh wagon. Yield per acre was calculated for each treatment.

scholarly journals Control of Insect Pests on Fall-Seeded Canola, 1997A

1998 ◽  
Vol 23 (1) ◽  
pp. 184-185
Author(s):  
D. E. Bragg
Keyword(s):  
Seed Treatment ◽  
Insect Pests ◽  
Full Bloom ◽  
Yield Data ◽  
Plant Materials ◽  
Pre Treatment ◽  
Western Regional ◽  
Sweep Net

Abstract Plots were established in a RCBD with 4 replicates of 20 X 30 ft at the USDA-ARS Western Regional Plant Materials Introduction Center at Central Ferry, WA on 10 Oct. Treatments were made at full bloom with a CO2 powered backpack sprayer at 20 gpa at 20 psi on 21 May except for Gaucho 75 ST applied as a seed treatment at planting. All sprayed insecticides were buffered to pH 5.0. Treatments were evaluated for pre-treatment count 215 DAE, 7 DAT (222 DAE), 12 DAT (227 DAE), and 25 DAT (250 DAE) by counting the number of CA colonies per m2 (6.6 linear ft of row) with mean number of CA per colony. CSPW counts were made on evaluation dates with 180° sweeps with a 14-inch sweep net. Counts of CSPW exit holes per 100 pods per replicate were made at harvest, and yield data were collected.

Registration of Russian Wheat Aphid Resistant Hard Red Spring Wheat Germplasm

Crop Science ◽  
1993 ◽  
Vol 33 (6) ◽  
pp. 1420-1420 ◽  
Author(s):  
S. P. Lanning ◽  
L. E. Talbert ◽  
G. D. Johnson
Keyword(s):  
Spring Wheat ◽  
Russian Wheat Aphid ◽  
Hard Red Spring Wheat ◽  
Wheat Germplasm

scholarly journals Variability of Fusarium Crown Rot Tolerances Among Cultivars of Spring and Winter Wheat

Plant Disease ◽  
2009 ◽  
Vol 93 (9) ◽  
pp. 954-961 ◽  
Author(s):  
Richard W. Smiley ◽  
Hui Yan
Keyword(s):  
Winter Wheat ◽  
Spring Wheat ◽  
Wheat Cultivar ◽  
Screening Method ◽  
Crown Rot ◽  
Yield Reduction ◽  
Winter Wheat Cultivar ◽  
Yield Data ◽  
Fusarium Crown Rot ◽  
Tolerance Response

Crown rot caused by Fusarium pseudograminearum reduces the yield of wheat (Triticum aestivum) in Oregon. Observations of crown rot symptoms in traditional breeding and yield testing nurseries have not been useful for describing tolerance ratings of wheat cultivars. Yield data from inoculated experiments were therefore evaluated to determine if differences in cultivar response could be identified. A comparison of yields in inoculated and noninoculated plots was made for one group of spring wheat entries and four groups of winter wheat entries. Significant differences among spring wheat entries were identified and were validated against standards for tolerance and intolerance to F. pseudograminearum in Australia. Locally adapted and Australian standards exhibited a comparable range of yield reduction due to inoculation. Spring wheat tolerance reactions can be accurately described using as few as 24 yield comparisons. However, this screening method will not be practical for winter wheat due to stronger effects of year and location on the phenotypic tolerance response, requiring about 95 yield comparisons to accurately define the crown rot phenotype of a winter wheat cultivar.

Resistance to Hessian fly (Diptera: Cecidomyiidae) in a Canadian spring wheat cultivar

2006 ◽  
Vol 138 (5) ◽  
pp. 638-646 ◽  
Author(s):  
Ian L. Wise ◽  
Robert J. Lamb ◽  
Ronald I.H. McKenzie ◽  
Jay W. Whistlecraft
Keyword(s):  
Spring Wheat ◽  
Partial Resistance ◽  
Yield Loss ◽  
Wheat Cultivar ◽  
Hessian Fly ◽  
Seedling Stage ◽  
Susceptible Cultivar ◽  
Wheat Cultivars ◽  
Yield Losses ◽  
Spring Wheat Cultivar

AbstractThe Canadian spring wheat (Triticum aestivum L.; Poaceae) cultivar ‘Superb’ was less susceptible to damage by Hessian fly, Mayetiola destructor (Say), than the spring wheat cultivars ‘AC Barrie’, ‘AC Foremost’, ‘McKenzie’, ‘AC Domain’, and ‘Glenlea’ in Manitoba. The partial resistance of ‘Superb’ was similar, at the seedling stage, to that of ‘Guard’, which possesses the resistance gene H18. Females laid eggs readily on all cultivars, providing no evidence for antixenosis, but few larvae developed on seedlings of ‘Superb’ and ‘Guard’, showing that antibiosis against larvae is the mechanism of resistance in these seedlings. In the field, where infestation of spring wheat takes place about 4 weeks after the seedling stage, ‘Guard’ continued to show high levels of resistance, but ‘Superb’ was less resistant, although still more resistant than highly susceptible cultivars. Infested stems of ‘Superb’ and ‘Nordic’ were less likely to break than infested stems of other cultivars, showing that these two cultivars are partially tolerant to infestation. Infested stems of ‘Guard’ and other cultivars showed high levels of stem breakage and are intolerant. Yield losses due to infestation by Hessian fly were mostly caused by the breakage and falling over of infested stems, which prevented the seeds on these stems from being harvested. Infested stems of all susceptible cultivars that remained standing at harvest had lower seed masses and fewer seeds per spike than uninfested stems, which contributed to yield loss. ‘Grandin’, a parent of ‘Superb’, is the probable source of resistance in ‘Superb’, but the pedigree of ‘Grandin’ provides no clue as to the gene(s) involved. The partial antibiosis and tolerance expressed by ‘Superb’ is sufficient to reduce losses to Hessian fly by 65% in comparison with a susceptible cultivar such as ‘AC Barrie’. ‘Superb’ is the first Canadian spring wheat cultivar identified to have an agronomically useful level of resistance to Hessian fly.

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