Download or read book Evaluations of Biological Control Agents for the Management of Soybean Cyst Nematode Heterodera Glycines in Soybean Glycine Max L Merr written by Kelsie M. Musil and published by . This book was released on 2016 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The soybean cyst nematode (SCN, Heterodera glycines) is the most yield limiting pathogen of soybeans (Glycine max L. Merr.). Current management strategies of crop rotation and using resistant varieties are not completely effective and alternative management strategies are needed. Commercial seed treatments with biological agents are available to protect against yield loss from SCN, but have not been evaluated in Nebraska. Field studies were conducted in eight Nebraska locations (six infested with SCN and two non-infested) during 2014 and 2015 to evaluate seed treatment effects on soybean establishment, SCN population density, and yield. The seed treatments were CruiserMaxx® Advanced, Clariva®Complete Beans containing Clariva®pn (Pasteuria nishizawae), and Poncho®/ VOTiVO® containing Bacillus firmus I-1582; all treatments contained the same fungicides and an insecticide with the same mode of action. Average yields in the SCN infested fields ranged from 45 to 72 bu/A and initial SCN population densities ranged from 200 to 4,300 eggs/100 cc's of soil. No statistical differences were found among the three treatments in either yield or SCN reproduction at any individual location or when the SCN infested locations were combined in either growing season. The use of cover crops (cereal rye, Secale cereale), and other bacteria have inconsistently reduced SCN populations in previous studies. The use a cover crop as a means to establish a biocontrol agent has not been investigated. Greenhouse experiments were conducted to evaluate the ability of the bacterium Lysobacter enzymogenes C3 to colonize the rhizospheres of cereal rye and soybean from populations applied to seed. The bacterium was found to colonize cereal rye roots to higher population levels than soybean over 4 week periods. C3 root populations on cereal rye increased by a thousand fold from seed populations. Based on these studies the potential for biocontrol for SCN exists, but more research is needed to determine optimum conditions for biocontrol agents to be effective tools in sustainable soybean production..

Download or read book Biology and Management of the Soybean Cyst Nematode written by Robert D. Riggs and published by American Phytopathological Society. This book was released on 1992 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1 History, distribution, and economics. 2 Systematics and morphology. 3 Epiphytology and life cycle. 4 Cellular responses to infection. 5 Population dynamics. 6 Genetics. 7 The race concept. 8 Nematode race identification, A look to the future. 9 Interactions with other organisms. 10 Host range. 11 Chemical control. 12 Management by cultural practices. 13 Biological control. 14 Breeding for resistance to soybean cyst nematode. 15 Cytopathological reactions of resistant soybean plants to nematode invasion. 16 Tolerance in soybean.

Download or read book The Soybean Cyst Nematode written by United States. Agricultural Research Service. Crops Research Division and published by . This book was released on 1968 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Soybean Cyst Nematode written by United States. Plant Pest Control Branch and published by . This book was released on 1957 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Soybean Glycine Max L Merr Source of Resistance to Soybean Cyst Nematode Heterodera Glycines Ichinohe written by Beth Holmes and published by . This book was released on 1996 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biology and Management of Soybean Cyst Nematode written by Donald Peter Schmitt and published by . This book was released on 2004-01-01 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Efficacy of Novel Nematicide Seed Treatments for the Control of Heterodera Glycines in Soybean Production written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterodera glycines Ichinohe, soybean cyst nematode (SCN), is the most damaging pathogen of soybean [Glycine max (L.) Merr.] in the United States. SCN juveniles are small thread-like, nonsegmented, microscopic worms that penetrate soybean root systems to establish a parasitic relationship that diverts essential plant nutrition to the feeding site. Adult females become pyriform while the males are vermiform. SCN suppresses growth and yield, but because rotation may be unattractive to growers, resistant cultivars may be unavailable, and effective safe alternatives are currently lacking, new control tactics for SCN management are needed. Currently the only non-fumigant nematicide registered for soybean is aldicarb. Aldicarb is highly toxic and is under review by the EPA for groundwater contamination and may not be available in the future. Two chemical seed treatments for management of plant-parasitic nematodes are Avicta (Syngenta Crop Protection) and Aeris (Bayer Crop Sciences). Avicta is a fermentation product (abamectin) derived from an actinomycete and Aeris is a mixture of the neonicotinoid insecticide imidacloprid and thiodicarb, a carbamate insecticide/nematicide. Both are currently registered for use as a seed treatment on cotton. Objectives for the current project were to evaluate the efficacy of both Avicta and Aeris as seed treatments on soybean for management of the soybean cyst nematode. In 2007 and 2008 field trials and microplot experiments were initiated to evaluate the efficacy of these seed treatments against SCN. Three rates of each seed treatment were applied, 0.10, 0.15, and 0.20 mg a.i/seed abamectin, and 0.20, 0.28, 0.36 mg a.i./seed imidicloprid+thiodicarb and compared to an untreated control and an in-furrow rate, 1.17 kg a.i./ha, of aldicarb. SCN populations were not reduced at the end of the growing season and that there were only limited yield benefits seen with either the Avicta or Aeris product at the three different rates. Population dens.

Download or read book Improving the Management of the Soybean Cyst Nematode Heterodera Glycines Ichinohe written by Leonardo José Frinhani Noia da Rocha and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant-parasitic nematodes represent a substantial constraint on global food security by reducing the yield potential of all major crops, including soybean (Glycine max L.). The soybean cyst nematode (SCN) (Heterodera glycines I.) is widely distributed across all soybean production areas of the US, and is the major yield-limiting factor, especially in the Midwestern US. Double cropping (DC) is defined as producing more than one crop on the same parcel of land in a single growing season. Compared to conventional single annual crops, DC provides many advantages, including improving soil health, enhanced nutrient provisioning to plants, improvement of soil physical properties, control of erosion, decrease in tillage requirements, and enhanced profitability. In some double-cropping systems, soybean is planted following winter wheat (Triticum aestivum L.), and several reports suggest the potential of wheat to suppress SCN populations. Field trials were conducted from 2017 to 2018 to investigate the effect of wheat on SCN populations in double-cropping soybean. Nine fields with three levels of initial SCN populations (low, moderate, and high) were selected in Illinois. Wheat was planted in strips alternating with strips-maintained weed-free and under fallow over winter and early spring. Soybean was planted in all strips after the wheat harvest. Soybean cyst nematode egg densities were acquired at four time points: wheat establishment, post-wheat/pre-soybean, mid-soybean (R1 growth stage or beginning of flowering), and post-soybean harvest. Wheat strips reduced SCN egg densities compared with fallow strips at the R1 stage (−31.8%) and after soybean harvest (−32.7%). Field locations with noted SCN suppression were selected for a metagenomics study. The structure of fungal communities differed significantly between DC and fallow plots at soybean planting and after harvest (P

Download or read book An Agent based Model to Simulate Virus based Biocontrol for the Soybean Cyst Nematode Heterodera Glycines written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Soybean Cyst Nematode written by and published by . This book was released on 1957 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Evaluation of Nematicides for the Control of the Soybean Cyst Nematode Heterodera Glycines Ichinohe written by Ousmane Kamara and published by . This book was released on 1983 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Herbicidal Effects on the Soybean Cyst Nematode Heterodera Glycines written by Cletus Dannitte Youmans and published by . This book was released on 1985 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Control of Soybean cyst Nematode Heterodera Glycines with a Soil borne Fungus written by Dong-Geun Kim and published by . This book was released on 1989 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annotated Bibliography of Nematodes of Soybeans 1882 1968 written by United States. Agricultural Research Service and published by . This book was released on 1973 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Molecular Markers for Resistance to Soybean Cyst Nematode Heterodera Glycines I in Soybean Glycine Max L Merr written by Ramamurthy Mahalingam and published by . This book was released on 1994 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annotated Bibliography of Nematodes of Soybeans 1969 73 written by Dale Ivan Edwards and published by . This book was released on 1975 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soybean Cyst Nematode Heterodera Glycines Resistance Genes in PI 8972 and PI 209332 Soybean written by M. da S. ASSUNCAO and published by . This book was released on 2000 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soybean cyst nematode(SCN), Heterodera glycines Ichinohe, is the most serious disease of soybean glycine max(L.) Merr., in the United States and also is a serious pest of soybean on a world-wide basis. The nematode was first found in the United States in North Carolina in 1954 and now occurs in 30 states. Crop rotation plays an important role in controlling the nematode. Control also utilizes different cropping systems and resistant soybean cultivars to supress yield loss caused by H. glycines. A racetest was developed in early 1970's to classify variability in the nematode and was expanded in late 1980's to include 16 races. Eight races have been identified in the United States and in the North Central United States race 3 is the prevalent. Several plants introductions have been found with resistance to the most important races that occur in the soybean production areas in Asia, North America, and South America. The number of resistance genes in PI 89772 and PI 209332 conferring resistance to H.glycines race 3 is not well defined. Crosses of PI 89772 x 'Lee 68', PI 88788 x PI 89772, and Lee 68 x PI 209332 were made in the field and greenhouse. To verify that F1 plants resulted from the cross rather than selfing, simple sequence repeat molecular marker analysis was used to characterize F1 plants and their parents. Several F1 and F2 families from each cross, 98 F3 families from cross PI 89772 x Lee 68, 74 F3 families from cross PI 88788 x PI 89772, and 80 F3 families from cross Lee 68 x PI 209332 were tested with an inbred line of H.glycines developedon 88788. Approximately 8,000 individual plants growing in pots containing 200 cm3 of sterilized soil were inoculated with 4,010 eggs and J2/pot. Thity days after inoculation the number of females that developed on each plant was determined. Cluster analysis revealed sets of families with a low mean number of femalesand low variance, intermediate means and high variance, and high means witha low variance, indicating F3 plants came from, respectively, homozygous resistant, heterozygous or segreganting, and homozygous susceptible F2 plants. Thus, resistance classes were considered as quantitative parameters having different levels of resistance as opposed to only two classes, either or susceptible. Chi-square analysis of segregation of phenotypic data indicated two genes confer resistance torace of H.glycines. One gene acts as a major gene (Rhgx) and the other a minor gene (Rhgy) in conferring resistance of the parents PI 89772 (Rhgx1?Rhgx1?Rhgy1?Rhgy1?) PI 88788 (Rhgx2?Rhgx2?Rhgy2?Rhgy2/), and PI 209332 (Rhgx3?Rhgx3?Rhgy3?Rhgy3) to H.glycine race 3. The same genes may occur in PI 209332 as in PI 89772, but support for this hypothesis must be obtained by studying the cross PI 209332 x PI 89772. The same major (Rhgx) and minor (Rhgy) genes occur in PI 89772 (Rhgx1?Rhgx1?Rhgy1?Rhgy1?) and PI 88788 (Rhgx2?Rhgx2?Rhgy2?Rhgy2?). The phenotypic ratios obtained in this research indicate that epsitasis occurs between loci Rhgyx and geney.