Effects of stubble-borne fungal inoculum on incidence of leaf diseases and yields of barley in Western Australia

1988 ◽  
Vol 28 (4) ◽  
pp. 529 ◽  
Author(s):  
TN Khan
Keyword(s):  
Powdery Mildew ◽  
Yield Loss ◽  
Rhynchosporium Secalis ◽  
Net Blotch ◽  
Yield Losses ◽  
Hordeum Vulgare L ◽  
Leaf Disease ◽  
Drechslera Teres ◽  
Barley Crop ◽  
Number Of Seeds

Effect of stubble residues on leaf diseases and yield of barley (Hordeum vulgare L. cv. Dampier) were studied by adding small quantities of infested stubble to test plots grown on land where a non-barley crop or pasture had been grown in the previous year. Experiments conducted at 5 locations in 198 1 and 1982 showed that stubble residues increased leaf disease. The severity of leaf disease varied with location and year. High levels of scald (Rhynchosporium secalis) were recorded at all locations, but substantial levels of net blotch (Drechslera teres) occurred only at northern locations. Halo spot (Selenophoma donacis) and a leaf spot caused by Drechslera verticillata were either absent or occurred in minor proportions. The incidence of powdery mildew (Erysiphe graminis f.sp. hordei) at Mt Barker in 1982 was not related to the presence of stubble residues. Grain yield losses of 9 and 28% occurred in the stubble amended plots in 1981 and 1982, respectively. Reductions in number of heads and number of seeds per plot appeared to be the major components of yield loss.

COMPARISON OF THE EFFECTS OF NET BLOTCH AND LEAF REMOVAL ON YIELD IN BARLEY

1969 ◽  
Vol 49 (6) ◽  
pp. 731-735 ◽  
Author(s):  
L. Piening ◽  
M. L. Kaufmann
Keyword(s):  
Leaf Tissue ◽  
Causal Agent ◽  
Low Fertility ◽  
Leaf Removal ◽  
Net Blotch ◽  
Yield Losses ◽  
Leaf Clipping ◽  
Drechslera Teres ◽  
Time Required

Experiments were conducted in a growth cabinet to compare yield losses in barley caused by partial defoliation and foliar infection by Drechslera teres, the causal agent of net blotch. When Gateway barley was grown under a low fertilizer regime, infection of lower leaves caused greater yield reductions than the removal of comparable leaves. In contrast, infection or removal of upper leaves reduced yields to about the same extent. Under a higher fertilizer regime, yield reductions from infection or defoliation were about equal (14%). These losses were considerably lower than those from plants on the low fertility regime and were similar to those caused by net blotch in the field.In leaf clipping experiments, root weights and yields were reduced proportionately to the amount of leaf tissue removed. The time required to head was also increased with increasing amounts of leaf clipping.

JOHNSTON BARLEY

1980 ◽  
Vol 60 (4) ◽  
pp. 1431-1433
Author(s):  
ROBERT I. WOLFE
Keyword(s):  
Hordeum Vulgare ◽  
Spring Barley ◽  
Yield Potential ◽  
High Yield ◽  
Rhynchosporium Secalis ◽  
Research Station ◽  
Hordeum Vulgare L ◽  
Canadian Prairies ◽  
Leaf Disease ◽  
High Yield Potential

Johnston, a six-rowed feed spring barley (Hordeum vulgare L.) was developed at the Agriculture Canada Research Station, Brandon, Manitoba from a cross involving Klondike, Bonanza and Nord. It has high yield potential across the Canadian prairies, particularly in parts of Alberta, resistance to scald (Rhynchosporium secalis), and excellent field leaf disease ratings.

THE EFFECT OF HAIL DAMAGE ON BARLEY

1979 ◽  
Vol 59 (4) ◽  
pp. 1147-1152 ◽  
Author(s):  
K. M. GILBERTSON ◽  
E. A. HOCKETT
Keyword(s):  
Hordeum Vulgare ◽  
Grain Yield ◽  
Yield Loss ◽  
Heading Date ◽  
Yield Losses ◽  
Heading Time ◽  
Hordeum Vulgare L ◽  
Positive Correlation ◽  
Hail Damage ◽  
Final Yield

After a severe hailstorm at Fort Ellis, Montana, an experienced hail insurance adjuster estimated 90–100% damage in replicated yield plots of barley (Hordeum vulgare L.). After harvest, grain yield losses for all 66 entries in the nursery were found to range from 26 to 84%. A group of 11 cultivars selected for further study averaged 55% less than normal yield with a range of 29–82%. Yield and heading date were significantly (P < 0.05) correlated for all cultivars (r = 0.39*, n = 42), within six-rowed cultivars (r = 0.79*, n = 7), and for the 11 selected cultivars (r = 0.62*, n = 11). Although there was no significant correlation between yield and heading date within two-rowed cultivars, a group of two-rowed early isogenics was significantly reduced in grain yield compared to their late counterparts. The number of days between heading and time of hail damage was a better indicator of final yield loss than number of culms remaining (the criterion used for hail-adjuster estimates of damage). Regrowth is more likely to occur in barley if the hail damage is near or before heading time rather than 5–15 days after heading. Therefore, the positive correlation in this test between late heading date and yield is because the later entries had just headed out when the hail came, while the low yielding entries headed 10–15 days before the hailstorm.

MASSEY BARLEY

1980 ◽  
Vol 60 (1) ◽  
pp. 277-278 ◽  
Author(s):  
GEORGE FEDAK ◽  
ROLAND LOISELLE ◽  
S. O. FEJER
Keyword(s):  
Powdery Mildew ◽  
Spring Barley ◽  
High Yield ◽  
Puccinia Hordei ◽  
Rhynchosporium Secalis ◽  
Research Station ◽  
Loose Smut ◽  
Hordeum Vulgare L ◽  
Breeder Seed ◽  
Growing Conditions

Massey is a new six-rowed spring barley (Hordeum vulgare L.) with high yield and resistance to powdery mildew (Erysiphe graminis), scald (Rhynchosporium secalis), leaf rust (Puccinia hordei) and it has the Jet genes for resistance to loose smut (Ustilago nuda). It is a nonmalting, mid-season cultivar well adapted to Ontario growing conditions. It was licensed in November 1978. Breeder seed of Massey will be maintained by Ottawa Research Station, Agriculture Canada.

ELLICE BARLEY

1987 ◽  
Vol 67 (3) ◽  
pp. 823-826 ◽  
Author(s):  
D. R. METCALFE
Keyword(s):  
Hordeum Vulgare ◽  
Powdery Mildew ◽  
Black Soil ◽  
Yield Potential ◽  
Malting Quality ◽  
Research Station ◽  
Malting Barley ◽  
Net Blotch ◽  
Hordeum Vulgare L ◽  
Soil Zone

Ellice is a two-rowed malting barley (Hordeum vulgare L.) developed at the Agriculture Canada Research Station, Winnipeg, Manitoba from a cross involving CI5791, Parkland, Betzes, Piroline, Akka, Centennial, Klages, Cambrinus and Tern. This cultivar (registration no. 2715) is earlier and has better straw strength and malting quality than Klages. It has demonstrated yield potential equal to Klages and Harrington throughout the prairie provinces. It is resistant to stem rust and powdery mildew and tolerant to net blotch and the surface borne smuts. It is best adapted to the Black Soil Zone of Manitoba and eastern Saskatchewan.Key words: Malting barley, barley, Hordeum vulgare

Effect of spot-type net blotch (Drechslera teres (Sacc.) Shoem) infection on barley yield in short season environment of northern cereal belt of Western Australia

1989 ◽  
Vol 40 (4) ◽  
pp. 745 ◽  
Author(s):  
TN Khan
Keyword(s):  
Western Australia ◽  
Field Experiments ◽  
Yield Loss ◽  
Yield Response ◽  
Net Blotch ◽  
Drechslera Teres ◽  
Percentage Yield ◽  
Negative Effect ◽  
Short Season ◽  
Spot Type

The effect of spot-type net blotch (Drechslera teres (Sacc.) Shoem.) on yield was studied in fourteen field experiments located at two sites over seven years in the area where the disease occurs; the northern cereal belt of south-west Western Australia. An overall reduction of 26% in grain yield occurred associated with spot-type net blotch infection. The yield losses varied depending upon season, date of sowing and cultivar. Disease was found to reduce 100 grain weight and number of ears/m2, but number of grains/ear were not affected. Regression analysis supported the above negative effect of disease on yield in general, but in a few cases disease and yield were positively correlated. The Area Under Curve (AUC) model was considered most appropriate and percentage yield loss (L) was estimated as L = 0.0233 AUC. Using this relationship, potential losses in yields of cvv. Beeeher and O'Connor were estimated to be 34% and 29%, respectively. The application of this relationship is suggested to be limited to short season environments similar to the northern cereal belt of Western Australia. A need to understand factors which modify the yield response to this disease is highlighted.

Effect on scald (Rhynchosporium secalis (Oud.) J. Davis) infection on yield response of Stirling barley to various sowing rates

1988 ◽  
Vol 28 (2) ◽  
pp. 263 ◽  
Author(s):  
TN Khan
Keyword(s):  
Yield Loss ◽  
Plant Density ◽  
Grain Weight ◽  
Yield Response ◽  
Rhynchosporium Secalis ◽  
Yield Losses ◽  
Significant Yield

The effect of a range of sowing rates on scald infection and yield in barley cv. Stirling was studied to investigate if increased plant density will lead to more ears/m2 and therefore compensate for yield losses due to scald. Increased sowing rate (50 v. 100 kg/ha) did not compensate for yield loss due to scald. However, significant yield increases (3.0 v. 4.0 t/ha) with increased sowing rates (25 v. 125 kg/ha) occurred when scald was controlled. Such yield in creases were accompanied by increases in the number of ears/m2 and number of grains/ha, but decreases in number of grains/ear and 100-grain weight. The severity of scald infection was not affected by sowing rates.

scholarly journals Field efficacy of different fungicide mixtures in control of net blotch on barley

2016 ◽  
Vol 31 (1-2) ◽  
pp. 51-57 ◽  
Author(s):  
Milos Stepanovic ◽  
Emil Rekanovic ◽  
Svetlana Milijasevic-Marcic ◽  
Ivana Potocnik ◽  
Biljana Todorovic ◽  
...  
Keyword(s):  
Disease Control ◽  
Effective Treatment ◽  
Net Blotch ◽  
Yield Losses ◽  
Yield Increase ◽  
Growing Seasons ◽  
Drechslera Teres ◽  
Field Efficacy ◽  
Fungicide Mixtures

Seven fungicide mixtures (epoxiconazol + metconazole, boscalid + epoxiconazole, pyraclostrobin + epoxiconazole, prothioconazole + tebuconazole, picoxistrobin + cyproconazole, azoxystrobin + cyproconazole and spiroxamine + tebuconazole + triadimenol) were evaluated for control of net blotch of barley caused by Drechslera teres, as well as yield losses, over the 2010 and 2011 growing seasons. Two applications of the fungicide combination pyraclostrobin + epoxiconazole at the rate of 1.0 l ha-1 were the most effective treatment in controlling the disease and improving yield in both experimental years. Treatments with the fungicide mixtures epoxiconazol + metconazole and spiroxamine + tebuconazole + triadimenol showed the least effectiveness in disease control, as well as yield increase.

Relationship between net blotch (Drechslera teres) and losses in grain yield of barley in Western Australia

1987 ◽  
Vol 38 (4) ◽  
pp. 671 ◽  
Author(s):  
TN Khan
Keyword(s):  
Critical Point ◽  
Western Australia ◽  
Yield Loss ◽  
Yield Reduction ◽  
Multiple Point ◽  
Net Blotch ◽  
Drechslera Teres ◽  
Percentage Yield ◽  
The Relationship ◽  
Common Equation

Losses in the yield of cv. Dampier due to net blotch (Drechslera teres (Sacc.) Shoem.) were examined in six environments in Western Australia. Based on comparison between least diseased and most diseased treatments, there was an overall yield reduction of 21% (P < 0.05). Three models (Critical Point, Area Under Curve and Multiple Point) were used to study the relationship between net blotch infection and percentage yield loss. All models gave similar results. Because of its simplicity, the Critical Point Model based on mean net blotch infection on the top three leaves at GS 75 was chosen. The percentage yield loss in cv. Dampier was defined to be 37% of the mean diseased area on leaves 1 (flag), 2 and 3 at GS 75. This relationship is very similar to that developed earlier for scald, and a common equation for both scald and net blotch was suggested.

Effects of fungicide seed dressings and fungicide-treated fertiliser on the severity of leaf diseases and yield of barley in Western Australia

1989 ◽  
Vol 29 (4) ◽  
pp. 565 ◽  
Author(s):  
TN Khan ◽  
KJ Young
Keyword(s):  
Hordeum Vulgare ◽  
Powdery Mildew ◽  
Disease Control ◽  
Western Australia ◽  
Erysiphe Graminis ◽  
Great Promise ◽  
Rhynchosporium Secalis ◽  
Hordeum Vulgare L ◽  
Foliar Diseases ◽  
Duration Of Disease

Standard and increased rates of seed dressings with triadimenol, flutriafol and experimental formulations of flutriafol, and triadimefon and flutriafol coated on double superphosphate and drilled at sowing were assessed for control of leaf diseases of barley (Hordeum vulgare L. cv. Stirling). Scald, (Rhynchosporium secalis (Oud.) Davis), powdery mildew (Erysiphe graminis f. sp. hordei March.) and Drechslera verticillata (O'Gara) Shoem. appeared in various experiments. Fungicide-coated fertilisers provided the most disease control for the longest duration, triadimefon coated fertiliser increasing yield by up to 30%. Fungicide-treated fertilisers therefore show great promise in increasing the level and duration of disease control as well as the yield of barley where foliar diseases are known to be a problem.

Sign in / Sign up

Export Citation Format

Share Document