A STUDY OF SUGAR BEET ROOTROT IN SOUTHERN ONTARIO

1949 ◽  
Vol 27c (6) ◽  
pp. 284-311 ◽  
Author(s):  
W. E. McKeen
Keyword(s):  
Sugar Beet ◽  
Disease Outbreaks ◽  
Pythium Ultimum ◽  
Acute Attack ◽  
Sugar Beets ◽  
Fungicidal Action ◽  
Southern Ontario ◽  
Aphanomyces Cochlioides ◽  
Parasitic Activity ◽  
Serious Disease

In southern Ontario rootrot of sugar beets may be caused by Aphanomyces cochlioides Drechs., Pythium aphanidermatum (Edson) Fitz., Pythium ultimum Trow, or Rhizoctonia solani Kuehn. The distribution of these fungi was found to be limited to soil type rather than to locality, A. cochlioides thus being found in the clay soils and P. aphanidermatum only in the sand loam. They were not present in the subsoil and were most abundant in the top two or three inches of surface soil. A. cochlioides, which was found for the first time in Canada in 1946, causes the so-called blackroot of sugar beets, and is the most economically important pathogen encountered. Blackroot appears either as an early acute attack or a later chronic one, but the acute phase is of major importance and occurs in epiphytotics during seedling development, usually when the beet is from two to five weeks old. Weather records and experiments have shown that serious disease outbreaks only occur when moisture is abundant and soil temperature exceeds 60° F. Susceptibility is sharply correlated with the developmental rhythm of the seedling and ends when the cortex of the hypocotyl is sloughed off. A. cochlioides is homothallic, attacks the hypocotyl of the beet, and develops in the intercellular spaces of the cortex. It will not grow at relative humidities of less than 99% and this sensitivity to all but extremely high humidity is believed to limit its parasitic activity. Microbiological studies indicated that the number of organisms in the rhizosphere of diseased sugar beet roots is much larger than in that of healthy beet roots. Since parallel rhizosphere responses followed local artificial killing of roots, they are believed to be due in part at least to the utilization of necrotic tissues or substances released on their breakdown. Streptomycin, but not penicillin, was effective in controlling rootrot in greenhouse experiments. Control with Arasan is achieved in part through a direct fungicidal action, but the evidence suggests that it may be due to a shift in the microbiological balance of the soil flora unfavorable to the pathogen.

scholarly journals Mycofumigation with Muscodor albus and Muscodor roseus for Control of Seedling Diseases of Sugar Beet and Verticillium Wilt of Eggplant

Plant Disease ◽  
2003 ◽  
Vol 87 (11) ◽  
pp. 1349-1354 ◽  
Author(s):  
A. M. Stinson ◽  
N. K. Zidack ◽  
G. A. Strobel ◽  
B. J. Jacobsen
Keyword(s):  
Sugar Beet ◽  
Solanum Melongena ◽  
Pythium Ultimum ◽  
Potato Dextrose Agar ◽  
Infested Soil ◽  
Damping Off ◽  
Stand Establishment ◽  
Aphanomyces Cochlioides ◽  
Alginate Capsules ◽  
Antimicrobial Volatiles

Mycofumigation is the use of antimicrobial volatiles produced by fungi such as Muscodor albusitalic and M. roseus for the control of other organisms. Sugar beet (Beta vulgaris L.) stand establishment was increased and disease severity decreased by mycofumigation with M. roseus and M. albus in autoclaved soil infested with Rhizoctonia solani, Pythium ultimum, or Aphanomyces cochlioides. Eggplant seedlings (Solanum melongena L.) transplanted into autoclaved soil infested with Verticillium dahliae and mycofumigated with M. albus and M. roseus had significantly less disease (P < 0.05) after 4 and 5 weeks compared with nonmycofumigated Verticillium-infested soil. The effect of formulation on efficacy of mycofumigation with M. roseus was tested using potato dextrose agar strips, alginate capsules, ground barley, pesta granules, and stabileze granules. The stabileze and ground barley formulations of M. roseus resulted in the best control of P. ultimum damping-off. The best control of A. cochlioides damping-off was with the stabileze formulation, and the stabileze, ground barley, and agar strip formulations provided similar control of R. solani damping-off. In soil infested with P. ultimum, mycofumigation with M. albus stabileze formulation resulted in stand establishment similar to that in the autoclaved soil. Mycofumigation was ineffective in controlling Fusarium wilt of sugar beet. Neither M. albus nor M. roseus affected sugar beet or eggplant growth or appearance except in the stabileze formulation, where stunting was noticed. Mycofumigation with M. albus and M. roseus shows promise for control of soilborne diseases caused by P. ultimum, A. cochlioides, R. solani, and V. dahliae.

scholarly journals First Report of Aphanomyces Root Rot of Sugar Beet in Nebraska and Wyoming

Plant Disease ◽  
2000 ◽  
Vol 84 (5) ◽  
pp. 596-596 ◽  
Author(s):  
R. M. Harveson
Keyword(s):  
Sugar Beet ◽  
Beta Vulgaris ◽  
Root Rot ◽  
Causal Agent ◽  
High Plains ◽  
Sugar Beets ◽  
Koch’S Postulates ◽  
First Report ◽  
Aphanomyces Cochlioides ◽  
Central High

Sugar beet (Beta vulgaris L.) plants exhibiting dull green and chlorotic foliage were first observed in a field near Dalton, NE, in late July 1999. Root symptoms included distal tip rot with internal, yellow-brown, water-soaked tissues. Isolations on MBV medium (1) consistently yielded Aphanomyces cochlioides Drechs. Water cultures produced primary zoospores that encysted at the tips of sporangiophores, followed by release of secondary zoospores within 12 h. Seedlings inoculated with zoospores began to die 2 weeks after emergence in a greenhouse. Symptoms on hypocotyls began as water-soaked lesions that turned black and thread-like. The causal agent was reisolated from infected seedlings, completing Koch's postulates. The disease was subsequently found in more than 15 separate fields, representing 5 of 11 sugar beet-growing counties in Nebraska and 1 county in Wyoming. In October, plants from the same fields were observed with stunted, distorted roots and superficial, scabby lesions associated with latent A. cochlioides infection. The pathogen could not be isolated from this stage but was confirmed by observing mature oospores within thin, stained sections under a microscope. The sections were additionally mixed with sterile potting soil and planted in the greenhouse with sugar beets. Several weeks after emergence, seedlings began to die, and the pathogen was reisolated. This represents the first report of Aphanomyces root rot and its spread in the Central High Plains. It also confirms that the described latent symptoms on sugar beet are caused by A. cochlioides. Reference: (1). W. F. Pfender et al. Plant Dis. 68:845, 1984.

CONVISO® SMART – an innovative approach of weed control in sugar beet

2016 ◽  
pp. 517-524 ◽  
Author(s):  
Martin Wegener ◽  
Natalie Balgheim ◽  
Maik Klie ◽  
Carsten Stibbe ◽  
Bernd Holtschulte
Keyword(s):  
Sugar Beet ◽  
Weed Control ◽  
Field Studies ◽  
Essential Amino Acids ◽  
Global Market ◽  
Sugar Beets ◽  
Dose Rates ◽  
Innovative System ◽  
Bayer Cropscience ◽  
Als Inhibitor

KWS SAAT SE and Bayer CropScience AG are jointly developing and commercializing an innovative system of weed control in sugar beet for the global market under the name of CONVISO SMART. The technology is based on the breeding of sugar beet cultivars that are tolerant to herbicides of the ALS-inhibitor-class with a broad-spectrum weed control. This will give farmers a new opportunity to make sugar beet cultivation easier, more flexible in its timing and more efficient. The use of CONVISO, as new herbicide in sugar beet, will make it possible to control major weeds with low dose rates of product and reduced number of applications in the future. The tolerance is based on a change in the enzyme acetholactate synthase, which is involved in the biosynthesis of essential amino acids. This variation can occur spontaneously during cell division. During the development, sugar beets with this spontaneously changed enzyme were specifically selected and used for further breeding of CONVISO SMART cultivars. As such, these varieties are not a product of genetic modification. Field studies with CONVISO SMART hybrids showed complete crop selectivity and a broad and reliable efficacy against a large range of major weeds. The bio-dossier for an EU-wide registration of CONVISO was submitted in April in 2015. The variety inscription process is in preparation in different countries. The system CONVISO SMART is scheduled to be available to farmers in 2018 at the earliest.

Determination of microbiological activity during the processing of frost damaged sugar beets

2014 ◽  
pp. 228-231 ◽  
Author(s):  
Maciej Wojtczak ◽  
Aneta Antczak-Chrobot ◽  
Edyta Chmal-Fudali ◽  
Agnieszka Papiewska
Keyword(s):  
Sugar Beet ◽  
Microbiological Activity ◽  
Microbiological Contamination ◽  
Sugar Beets ◽  
Bacterial Metabolites ◽  
Kinetics Of

The aim of the study is to evaluate the kinetics of the synthesis of dextran and other bacterial metabolites as markers of microbiological contamination of sugar beet.

scholarly journals Sensitivity of Cercospora beticola Isolates to Azoxystrobin

2020 ◽  
Vol 69 (1-2) ◽  
pp. 1-4
Author(s):  
Milijanka Balandžić ◽  
Vera Stojšin ◽  
Mila Grahovac ◽  
Ferenc Bagi ◽  
Mladen Petreš ◽  
...  
Keyword(s):  
Biological Activity ◽  
High Risk ◽  
Sugar Beet ◽  
Mycelial Growth ◽  
Cercospora Beticola ◽  
Experimental Site ◽  
Sugar Beets ◽  
Qoi Fungicides ◽  
Moderately Resistant ◽  
Very High

SummarySugar beet leaf spot, caused by the air-borne fungus Cercospora beticola Sacc., leads to a decrease in sugar beet leaf mass and the consequent regrowth of leaves based on exploiting the sugar reserves stored in the plant’s roots, thus ultimately resulting in lower yields and sugar contents of sugar beets. Azoxystrobin belongs to the group of QoI fungicides, which inhibit mitochondrial respiration by blocking cytochrome c reductase. The QoI fungicides are characterized by a very high risk of resistance interfering with their biological activity. For the purpose of testing the azoxystrobin sensitivity of the Cercospora beticola population found at the site of Rimski Šančevi, a collection of 84 isolates was assembled and tested for sensitivity to azoxystrobin by measuring the mycelial growth on fungicide-amended media with the addition of SHAM. The results obtained indicate that none of the isolates tested exhibited complete sensitivity to azoxystrobin, 4% were found to have reduced sensitivity, 26% were moderately resistant and 70% were highly resistant. A higher proportion of resistant isolates recorded is associated with the loss of azoxystrobin biological efficacy at the experimental site.

scholarly journals The intensity of mechanical cultivation measures vs. the amount of weed seeds in the soil

2013 ◽  
Vol 54 (1) ◽  
pp. 163-173
Author(s):  
Marian Wesołowski ◽  
Cezary Kwiatkowski
Keyword(s):  
Sugar Beet ◽  
Species Composition ◽  
Deep Layer ◽  
Mineral Fertilization ◽  
Loessial Soil ◽  
Sugar Beets ◽  
Weed Seeds ◽  
Emergence Phase ◽  
Weed Removal

The effect of the number of mechanical operations in sugar beets plantation on the amount and species composition of weed seeds in the 0-5 cm deep layer of the loessial soil was studied. It has been proved that reduction in the number of weed seeds depends upon both the frequency of weeding-out operations and the level of agrotechnic. The highest decrease in the number of fruit and weed seeds was caused by eightfold weed removal which took place during the period from emergence phase to the joining of sugar beet rows. Application of increased mineral fertilization, microelements, fungicides, and insecticides caused the number of weed seeds to be reduced by 5,9%, in comparison to extensive agrotechnical level.

scholarly journals Fertilizer circulation and nitrogen balance in the agrophytocenosis of sugar beet when acidizing typical chernozem (study with 15n)

2021 ◽  
Vol 36 ◽  
pp. 03017
Author(s):  
A.S. Avilov ◽  
N.Ya. Shmyreva ◽  
A.A. Zavalin ◽  
O.A. Sokolov
Keyword(s):  
Sugar Beet ◽  
Sugar Content ◽  
Mineral Fertilizers ◽  
Nitrogen Compounds ◽  
Gaseous Nitrogen ◽  
Typical Chernozem ◽  
Sugar Beets ◽  
Beet Root ◽  
Combined Application ◽  
Root Crops

The studies were carried out under the conditions of a microfield experiment on typical chernozem (Belgorod region) with two soils (pH 5.0 and 6.5) with the addition of urea (enriched in 15N, 17.1 at. %) And effluents from a pig-breeding complex (PSC) at doses of 6 and 12 g N/m2 (against the background of phosphate and potash fertilizers, P6K6). The largest amount of nitrogen was consumed by sugar beets with the combined introduction of CCA and urea (25.8 g N/m2). When the soil was acidified to pHsalt 5.0, the consumption of nitrogen in mineral fertilizers decreased by 15-18%, soil ni-trogen – by 21-52%, and waste nitrogen – by 16%. At the same time, the immobilization of nitrogen in the fertilizer decreased by 13-18%, and the loss of gaseous nitrogen compounds increased by 47-108%. The effluent from the pig-breeding complex increased the immobilization of nitrogen in mineral fertilizers (by 38-46%) and reduced gaseous nitrogen losses (by 22-44%). The highest stability and productivity (root crop yield 1654 g/m2, tops yield 239 g/m2) was exhibited by agrophytocenosis on soil with pH 6.5 with the combined application of CCA and urea. When the soil solution was acid-ified to pH 5.0, the yield of beet root crops decreased by 30% and the yield of tops – by 24%. On soil with pH 5.0, fertilizers increased the sugar content in root crops by 0.2-1.3%, on soil with pH 6.5, they decreased by 1.3-2.0%.

scholarly journals Improvement of Technological Indicators of Semi-Finished Products of Sugar Production from Bacterially Infected Sugar Beet

2021 ◽  
pp. 458-469
Author(s):  
Lubov Belyaeva ◽  
Michail Pruzhin ◽  
Alla Ostapenko ◽  
Valentina Gurova
Keyword(s):  
Sugar Beet ◽  
Antimicrobial Agent ◽  
Enzyme Preparation ◽  
Special Role ◽  
Sugar Production ◽  
Sugar Beets ◽  
Effective Removal ◽  
Combined Use ◽  
Depth Study

Introduction. Technological aids play a special role in sugar production technology, but their complex effectiveness requires a comprehensive and in-depth study. The research objective was to establish the patterns of change in the technological indicators of semi-finished products obtained from bacterially infected sugar beets with the combined use of an enzyme preparation, antimicrobial agent, and defoamer. Study objects and methods. The study involved such semi-finished products as juice (diffusion, pre-defecated, first and second saturation) and syrup, the quality of which was determined according to standard methods. The laboratory experiment was carried out on the basis of the second-order D-optimal Box-Behnken plan for three factors at three levels. Results and discussion. The research revealed positive dynamics of the following technological indicators: sucrose content, deposition rate, turbidity, chromaticity, and general purification effect. The sugar beet had the second degree of infection with mucous bacteriosis. Purified juice underwent lime-carbon dioxide purification and thickening under the combination of enzyme preparation Dextrasept 2, antimicrobial agent Betasept, and antifoam agent Voltes FSS 93. The greatest increase in sucrose at the level of 1.1% by DM weight was confirmed by a higher overall effect of purification of diffusion juice (2.2 %). The values of turbidity of the purified juice and syrup were below the threshold values. The low values resulted from the increase in the sedimentation rate of the pre-defective juice and the juice of the first saturation by an average of 4.1 and 3.2 times, respectively, due to the effective removal of high molecular weight compounds. The share of the enzyme preparation was 40–71%, antimicrobial agent – 19–49%, defoamer – 1.6–6.5%. The values of the multicriteria optimization parameter corresponded with technological indicators. The optimal combination (per 1000 tons of beets) included 6–8 kg of Dextrasept 2, 1.5–2.0 kg of Betasept, and 15–20 kg of Voltes FSS 93. As a result, the yield of white sugar increased by 0.25%. Conclusion. The regression dependencies can be recommended for predicting the main technological indicators of semi-finished products. The resulting data makes it possible to determine the effectiveness of the combined use of an enzyme preparation, antimicrobial agent, and defoamer in sugar production. Further research will identify the patterns of multifactorial interaction of these preparations.

Aphanomyces cochlioides. [Distribution map].

2021 ◽  
Author(s):  
Keyword(s):  
Nova Scotia ◽  
North America ◽  
South America ◽  
Sugar Beet ◽  
South Dakota ◽  
Geographical Distribution ◽  
Spinacia Oleracea ◽  
Distribution Map ◽  
Aphanomyces Cochlioides ◽  
New Distribution

Abstract A new distribution map is provided for Aphanomyces cochlioides Drechsler. Peronosporea: Saprolegniales: Leptolegniaceae. Hosts: spinach (Spinacia oleracea), sugar beet (Beta vulgaris), and other members of the Chenopodiaceae and Amaranthaceae. Information is given on the geographical distribution in Africa (Egypt), Asia (Japan, Hokkaido, Turkey), Europe (Austria, Belgium, Bulgaria, Croatia, Denmark, Estonia, France, Germany, Hungary, Ireland, Moldova, Netherlands, Poland, Russia, Spain, Sweden, Ukraine, UK), North America (Canada, Alberta, Nova Scotia, Ontario, Quebec, USA, Arizona, California, Connecticut, Idaho, Indiana, Iowa, Maine, Michigan, Minnesota, Montana, Nebraska, North Dakota, Ohio, South Dakota, Texas, Washington, Wisconsin, Wyoming), Oceania (Australia, Queensland), and South America (Chile).

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