COMMON ROOTROT AND PLANT DEVELOPMENT FOLLOWING TREATMENTS OF WHEAT SEED WITH ALDRIN, GAMMA BHC, AND HEPTACHLOR, WITH AND WITHOUT MERCURY FUNGICIDES

1960 ◽  
Vol 40 (4) ◽  
pp. 672-679 ◽  
Author(s):  
R. H. Burrage ◽  
R. D. Tinline
Keyword(s):  
Grain Yield ◽  
Plant Development ◽  
Field Tests ◽  
Cochliobolus Sativus ◽  
Wheat Seed ◽  
Seed Treatments ◽  
Wheat Seedlings

Common rootrot in Chinook wheat seedlings was more pronounced after seed treatments with gamma BHC at 1 oz. per bu. than after aldrin or heptachlor at the same rate or no insecticide, in soils inoculated with Cochliobolus sativus (Ito and Kurib.) Drechs. ex Dastur in greenhouse and field tests. In one of four tests rootrot was greater after heptachlor than after aldrin seed treatments. Disease increased progressively with an increase in rate of application of gamma BHC, but not of heptachlor, from [Formula: see text] to 1 oz. per bu. Reduced emergence and seedling weight following the higher rates of gamma BHC apparently were caused by phytotoxicity of the seed dressings rather than by the increases in rootrot. In field tests rootrot frequently was greater, and emergence less, without insecticides than with most insecticides, possibly because of damage to the plants by wireworms.The inclusion of a mercury fungicide with the insecticide, except gamma BHC at [Formula: see text] and 1 oz. per bu., usually reduced rootrot and increased emergence and seedling weight in inoculated soils.Wheat plants apparently recovered from early stunting associated with phytotoxicity and rootrot as there were no differences in grain yield per plant between seed treatments or between inoculated and uninoculated soils.

Assessment of tolerance in wheat and barley to common root rot (Cochliobolus sativus)

1993 ◽  
Vol 73 (4) ◽  
pp. 1177-1187 ◽  
Author(s):  
L. J. Duczek ◽  
G. B. Wildermuth
Keyword(s):  
Grain Yield ◽  
Root Rot ◽  
Dry Matter ◽  
Field Tests ◽  
Cochliobolus Sativus ◽  
Disease Assessment ◽  
Growth Stages ◽  
Common Root ◽  
Common Root Rot ◽  
The Relationship

Field tests at Saskatoon, Saskatchewan, Canada indicated no evidence of tolerance to common root rot in four spring wheat cultivars. There was a relationship between increased yield losses and increasing disease. In barley, the relationship was inconsistent in four cultivars and there was evidence of tolerance or recovery in Melvin with the number of seeds per head increasing with the level of disease. In Queensland, Australia there was evidence of tolerance in the wheat cultivar Banks across two locations, but the response was not consistent in all cultivars. Dry matter loss at immature growth stages was not related to grain yield loss. The inconsistent expression of tolerance in wheat, the difficulty of assessing it, and the difficulty of distinguishing tolerance from recovery suggest that the assessment of tolerance is not a reliable method of determining the reaction to common root rot. The relationship between loss in dry matter and grain yield, as disease increased, indicates that disease assessment should continue to be based on severity of symptoms. The evidence of tolerance to common root rot in barley suggests research on tolerance should concentrate on barley instead of wheat. Key words: Cochliobolus sativus, common root rot, tolerance, wheat, barley

The epidemiology of common root rot in Manitou wheat: disease progression during the growing season

1974 ◽  
Vol 52 (7) ◽  
pp. 1757-1764 ◽  
Author(s):  
P. R. Verma ◽  
R. A. A. Morrall ◽  
R. D. Tinline
Keyword(s):  
Triticum Aestivum ◽  
Disease Severity ◽  
Plant Development ◽  
Root Rot ◽  
Growing Season ◽  
Cochliobolus Sativus ◽  
Infection Rates ◽  
Common Root ◽  
Common Root Rot ◽  
Disease Rating

Common root rot in Triticum aestivum cultivar Manitou caused primarily by Cochliobolus sativus was followed during plant development in 1969, 1970, and 1971 at Matador, Saskatchewan. Plants were sampled at intervals, and three variables based mainly on the occurrence of lesions on subcrown internodes were studied: number of diseased plants per square meter; percentage of diseased plants; and disease rating which integrated percentage of diseased plants and disease severity on each plant. All variables increased with time, and the progression curves in all 3 years were hyperbolic, indicating that the increases were like those of a simple interest disease as described by Van der Plank. In two of the years, almost 100% of the plants were diseased considerably before the end of the season. The transformation proposed by Van der Plank for simple interest diseases, log10[1/(1 − x)], was applied to the percentages of diseased plants, and regressions were calculated. The slopes of these lines (infection rates) were as follows: 1969, 0.99% plants per day; 1970, 1.32%; and 1971, 1.96%. In 1969 the onset of disease was later than in 1970 and 1971, and there was correspondingly less disease at the end of the growing season.

Effectiveness of fungicide seed treatments for preventing seed-to-seedling transmission of Fusarium graminearum under controlled-environment conditions

2009 ◽  
Vol 89 (4) ◽  
pp. 811-821 ◽  
Author(s):  
M R Fernandez ◽  
T K Turkington ◽  
W E May
Keyword(s):  
Fusarium Graminearum ◽  
Plant Tissue ◽  
Seedling Emergence ◽  
Wheat Root ◽  
Crown Rot ◽  
Controlled Environment ◽  
Wheat Seed ◽  
Seed Treatments ◽  
Head Blight ◽  
Infected Seed

Fusarium head blight (FHB) is well established in the eastern prairies, but for the most part it has been absent from western regions, especially under dryland conditions. This has been largely attributed to dry and hot conditions during some years, and the limited occurrence of F. graminearum in the western prairies. It is of importance to prevent the movement of F. graminearum, the most important FHB pathogen in North America, to areas where this pathogen is not commonly found. Three controlled-environment studies, using different Fusarium-infected common and durum wheat seed lots, were conducted to determine the effectiveness of currently registered fungicide seed treatments in improving seedling emergence and plant development, and preventing the growth of F. graminearum from infected seed to plant tissue. Fungicide treatments improved seedling emergence from the most infected seed over the untreated infected control, but most treatments did not improve emergence in the other experiments. Plant growth in the fungicide treatments was either similar to or slower than in the untreated controls. Fusarium graminearum was isolated from discoloured tissue in all treatments and was generally more common in crowns than in subcrown internodes. No fungicide treatment reduced discolouration of plant tissue or percentage isolation of F. graminearum or other Fusarium spp. consistently. We conclude that while currently registered seed treatments might be effective in improving seedling emergence in some infected wheat seed lots, they do not prevent the growth of F. graminearum from seeds to plant tissue. For the western prairies, the use of fungicide seed treatments as a strategy in the prevention of spread of FHB would require that they be effective primarily against F. graminearum. Performance of fungicide seed treatments against Fusarium-infected wheat seed should also be determined under typical growing conditions across the western prairies.Key words: Seed treatments, fungicides, wheat, root rot, crown rot, Fusarium graminearum, Fusarium avenaceum

scholarly journals Barley yield formation under abiotic stress depends on the interplay between flowering time genes and environmental cues

2018 ◽  
Author(s):  
Mathias Wiegmann ◽  
Andreas Maurer ◽  
Anh Pham ◽  
Timothy J. March ◽  
Ayed Al-Abdallat ◽  
...  
Keyword(s):  
Grain Yield ◽  
Flowering Time ◽  
Plant Development ◽  
Abiotic Stresses ◽  
Wild Barley ◽  
Nitrogen Deficiency ◽  
Pleiotropic Effects ◽  
Day Length ◽  
Environmental Cues ◽  
Yield Formation

AbstractSince the dawn of agriculture, crop yield has always been impaired through abiotic stresses. In a field trial across five locations worldwide, we tested three abiotic stresses, nitrogen deficiency, drought and salinity, using HEB-YIELD, a selected subset of the wild barley nested association mapping population HEB-25. We show that barley flowering time genes Ppd-H1, Sdw1, Vrn-H1 and Vrn-H3 exert pleiotropic effects on plant development and grain yield. Under field conditions, these effects are strongly influenced by environmental cues like day length and temperature. For example, in Al-Karak, Jordan, the day length-sensitive wild barley allele of Ppd-H1 was associated with an increase of grain yield by up to 30% compared to the insensitive elite barley allele. The observed yield increase is accompanied by pleiotropic effects of Ppd-H1 resulting in shorter life cycle, extended grain filling period and increased grain size. Our study indicates that the adequate timing of plant development is crucial to maximize yield formation under harsh environmental conditions. We provide evidence that wild barley germplasm, introgressed into elite barley cultivars, can be utilized to improve grain yield. The presented knowledge may be transferred to related crop species like wheat and rice securing the rising global food demand for cereals.

scholarly journals Different soaking times and niacin concentrations affect yield of upland rice under water deficit conditions

2019 ◽  
Vol 37 (2) ◽  
pp. 166-172
Author(s):  
Eduardo Pradi Vendruscolo ◽  
Aliny Heloísa Alcântara Rodrigues ◽  
Sávio Rosa Correa ◽  
Alexander Seleguini ◽  
Sebastião Ferreira de Lima
Keyword(s):  
Grain Yield ◽  
Water Deficit ◽  
Plant Development ◽  
Maximum Concentration ◽  
Upland Rice ◽  
Seedling Emergence ◽  
Rice Seed ◽  
Relative Index ◽  
Spikelets Per Panicle ◽  
Production Characteristics

Rice is an important source of energy for a large part of the world’s population. The development and application of technologies that contribute to the improvement of production forthis grain have great importance. The objective of this study was to evaluate the influence of rice seed immersion in a niacin solution on plant development, physiology and production. Thetreatments were defined by a combination of two immersion times for the seeds (12 h and 24 h) in four niacin concentrations (0.00, 100, 200 and 300 mg L-1) distributed in five replicates. Characteristics relating to seedling emergence, plant vegetativedevelopment, relative indices of chlorophyll and grain yield were evaluated. We verified that the immersion of the seeds for 12 h gave higher relative indices of chlorophyll, whereas immersion for 24 h increased the speed of emergence and the number of tillers and panicles. The doses of niacin positively affected the relative chlorophyll indices and the production characteristics, up to a maximum concentration of 172.57 mg L-1. We concluded that the immersion of rice seeds for 24 h increased the speed of seedling emergence, leaf number, and panicles per area. However, the relative indices of chlorophyll in leaves decreased. The use of niacin promoted the numbers of spikelets per panicle, fertility of the spikelets and the weight of 1000 grains, besides increasing the relative index of chlorophyll in the leaves of rice plants.

The effect of common root rot on components of grain yield in Manitou wheat

1976 ◽  
Vol 54 (24) ◽  
pp. 2888-2892 ◽  
Author(s):  
P. R. Verma ◽  
R. A. A. Morrall ◽  
R. D. Tinline
Keyword(s):  
Triticum Aestivum ◽  
Grain Yield ◽  
Disease Severity ◽  
Root Rot ◽  
Major Effect ◽  
Kernel Weight ◽  
The Other ◽  
Cochliobolus Sativus ◽  
Common Root ◽  
Common Root Rot

The effects of common root rot (Cochliobolus sativus) on components of grain yield in naturally infected Triticum aestivum cultivar Manitou were studied at Matador, Saskatchewan, by sampling plants at maturity in 1969, 1970, and 1971. Plants were sorted into severe (SE), moderate (MO), slight (SL), and clean (CL) categories based mainly on the extent of lesions on the subcrown internodes. The number of tillers per plant, the number and weight of grains per head, the weight per head, and the 1000-kernel weight in each category were determined. Increasing values of all five components were consistently associated with decreasing disease severity. SE was mostly significantly different from the other three categories in all components except 1000-kernel weight; differences between SL and MO were usually non-significant. CL and SL were mostly significantly different for the number of tillers per plant and weight per head but non-significant for the weight and number of grains per head and 1000-kernel weight. Apparently, the major effect of common root rot was to reduce the number of tillers per plant and number of grains per head.

Experiments on the control of cereal smuts with a derivative of 1,4-oxathiin

1968 ◽  
Vol 8 (31) ◽  
pp. 232 ◽  
Author(s):  
J Kuiper
Keyword(s):  
Active Ingredient ◽  
Post Infection ◽  
Severely Injured ◽  
In Vitro Germination ◽  
Wheat Seed ◽  
Loose Smut ◽  
Common Bunt ◽  
Wheat Seedlings ◽  
Cereal Seed

The new cereal seed dressing Vitavax, a systemic fungicidal dust based on 2,3-dihydro- 5-carboxanilido-6-methyl-1,4-oxathiin, controlled seed-borne common bunt of wheat, seed- and soil-borne flag smut of wheat, and covered smut of oats in glasshouse experiments. Its chemotherapeutic efficacy was demonstrated on wheat bunt using post-infection soil drenches. Vitavax was ineffective on loose smut of wheat and barley under semi-artificial conditions. Vitavax was toxic to wheat seedlings only when applied in a soil drench (0.02 per cent active ingredient) shortly after transplanting, but the surviving, severely injured plants recovered quickly indicating rapid elimination of the phytotoxicant. In in vitro germination tests on wheat Vitavax was safer than the standard fungicide Ceresan.

Wireworm Management I: Stand Protection Versus Wireworm Mortality With Wheat Seed Treatments

2009 ◽  
Vol 102 (6) ◽  
pp. 2126-2136 ◽  
Author(s):  
Robert S. Vernon ◽  
Willem G. Van herk ◽  
Markus Clodius ◽  
Chantelle Harding
Keyword(s):  
Wheat Seed ◽  
Seed Treatments

Plant development and grain yield in spring and winter barley

1984 ◽  
Vol 102 (1) ◽  
pp. 85-95 ◽  
Author(s):  
R. P. Ellis ◽  
G. Russell
Keyword(s):  
Water Stress ◽  
Grain Yield ◽  
Soil Water ◽  
Plant Development ◽  
Early Spring ◽  
Winter Barley ◽  
Considerable Reduction ◽  
Rate Of Development ◽  
Soil Water Stress

SummaryThe development of spring and winter barley sown in both the spring and autumn has been followed in two seasons. The rates of development were similar in both types for autumn sowings but the spring types developed faster in spring sowings. Differences in the rate of development were related to photoperiod and temperature although soil water stress modified variety response. Yields were higher from autumn and early spring sowings. Sowing in April resulted in a considerable reduction in yield. The significance of these results for barley breeders is discussed.

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