Open Access. Powered by Scholars. Published by Universities.®
- Discipline
Articles 1 - 11 of 11
Full-Text Articles in Entire DC Network
Effect Od Different Sources And Application Rates Of Sulfur On Corn And Soybean Production Systems In Louisiana, Diego Mayorga Valladares
Effect Od Different Sources And Application Rates Of Sulfur On Corn And Soybean Production Systems In Louisiana, Diego Mayorga Valladares
LSU Master's Theses
Sulfur (S) is a structural component of amino acids such as cysteine and methionine and is involved in important functions within the plant like photosynthesis, carbon and nitrogen metabolism, protein synthesis of oils, and detoxification mechanisms. Sulfur deficiency in crops has intensified around the world. Some of the reasons are improvement in controlling SO2 emissions from industries, growing usage of high analysis S-free fertilizers and augmented cropping intensity. Sulfur fertilization has become an important factor in crop production systems and fertilization guidelines for S need to be up-to-date to improve use efficiency and compensate for rising prices of fertilizers. …
Re-Evaluation Of Late Season Action Thresholds And The Effect Of Seed Treatments On Early Season Colonization Of Threecornered Alfalfa Hopper, Spissistilus Festinus (Say), In Louisiana Soybean, Glycine Max (L) Merr, Tyler Ray Tagle Musgrove
Re-Evaluation Of Late Season Action Thresholds And The Effect Of Seed Treatments On Early Season Colonization Of Threecornered Alfalfa Hopper, Spissistilus Festinus (Say), In Louisiana Soybean, Glycine Max (L) Merr, Tyler Ray Tagle Musgrove
LSU Master's Theses
Soybean, Glycine max (L.) Merr, is considered the most economically important oil and feed crop in the US and is grown on nearly 35,000,000 ha on an annual basis. Factors that limit yield include weed pressure, disease infection, and of particular interest to entomologists, insect herbivory. Soybean is targeted by a range of above and below ground pests which are primarily controlled by insecticides. Neonicotinoids are a recently popularized insecticide class that when applied as a seed treatment, can provide protection from early season pests. The most economically significant early season pest is threecornered alfalfa hopper, Spissistilus festinus (Say), whose …
Influence Of Planting Date, Maturity Group, Harvest Aids And Fungicide Application On Soybean (Glycine Max (L.) Seed Quality, Ana Priscila Campos
Influence Of Planting Date, Maturity Group, Harvest Aids And Fungicide Application On Soybean (Glycine Max (L.) Seed Quality, Ana Priscila Campos
LSU Master's Theses
Field studies evaluated the influence of planting date, maturity group, and harvest timing on soybean yield and seed quality at the LSU AgCenter Northeast (NERS), Macon Ridge, and Dean Lee Research Stations in 2018-2020. In addition, the influence of harvest aid and fungicide application on seed quality impact from delayed harvest and environment was investigated at NERS in 2019 and 2020 in both field and environmentally controlled growth chambers. Soybean yield was maximized when maturity group IV and V soybean varieties were planted between Mid-April and Mid-May. Earlier and later planting dates did not result in maximized yield. Planting date …
Developing Management Strategies For Taproot Decline, Xylaria Sp., In Soybean, Myra Purvis
Developing Management Strategies For Taproot Decline, Xylaria Sp., In Soybean, Myra Purvis
LSU Master's Theses
Soybean (Glycine max) is one of the most important oilseed crops in the world. Taproot decline is a recently discovered disease caused by Xylaria sp., a novel species located within the Xylaria arbuscula aggregate. Foliar symptoms include interveinal chlorosis and necrosis, and upon further investigation, there are often dead plants adjacent within the row. Many other soybean diseases have similar foliar symptoms; therefore, more examination is usually required for proper identification. Soybean debris from previous years is suspected to be the primary source of inoculum. Plants may be infected at any point during the growing season, often …
Distinguishing Isolates Of Rotylenchulus Reniformis Endemic In Louisiana On The Basis Of Root-Associated Females And Egg Masses, Benjamin Mcinnes
Distinguishing Isolates Of Rotylenchulus Reniformis Endemic In Louisiana On The Basis Of Root-Associated Females And Egg Masses, Benjamin Mcinnes
LSU Master's Theses
The reniform nematode Rotylenchulus reniformis is a major pathogen of soybean and cotton in Louisiana. Previous studies have shown that populations of reniform nematode throughout the southern United States vary in reproduction and pathogenicity. Limited studies have been conducted to evaluate the reproduction and pathogenicity of populations of R. reniformis endemic in Louisiana. Studies with isolates of the nematode from eight cotton-producing parishes focused solely on reproduction of the root-associated infective and swollen female life stages with and without attached egg masses on the cotton genotypes MT2468 Ren3, M713 Ren5, and Stoneville 4946GLB2 and the soybean genotypes PI 548316, PI …
Effects Of Elicitor Induced Host Plant Resistance On Lepidopteran Insecticide Efficacy, Abigail Cox
Effects Of Elicitor Induced Host Plant Resistance On Lepidopteran Insecticide Efficacy, Abigail Cox
LSU Master's Theses
Soybean looper (SBL), Chrysodeixis includens (Walker), is an important defoliating Lepidopteran pest of southern U.S. soybean and utilizes other agronomic crops and weeds as hosts. With increasing resistance to insecticides, alternative control strategies such as induced host plant resistance were evaluated against SBL. Jasmonic acid (JA) is an elicitor of host plant resistance, and was selected to determine its fit in an IPM plan for SBL. JA was applied to the top of meridic SBL diet and fed to SBL; no effects were found. JA applied as an exogenous elicitor to cotton, sweet potato, okra, cowpea, and soybean did result …
Herbivore Response To Soybean Under Differing Induction Methods, John L. Dryburgh
Herbivore Response To Soybean Under Differing Induction Methods, John L. Dryburgh
LSU Master's Theses
Plants are attacked by a variety of herbivore feeding guilds and respond with specific responses to specific attacks, which may be localized or systemic. How a plant defends against one feeding guild may alter the plant’s response against a different feeding guild. A better understanding of these interactions will allow for the development of refined pest management programs. One situation in which this may occur is in interactions between chewing and piercing/sucking herbivores, such as aphids. Aphids are important crop pests primarily due to their ability to transmit viruses, the efficacy of which can be affected by plant defenses. To …
Effects Of Minor Elements On Cercospora Kikuchii, Cercospora Leaf Blight And Rust On Soybeans, Brian Michael Ward
Effects Of Minor Elements On Cercospora Kikuchii, Cercospora Leaf Blight And Rust On Soybeans, Brian Michael Ward
LSU Master's Theses
Soybean (Glycine max) is one of the most widely grown crops in the world. Many pathogens attack soybeans, but of particular importance to tropical and subtropical areas such as Louisiana is Cercospora leaf blight (CLB). This disease is caused by the fungus Cercospora kikuchii and favored by high temperatures. This fungus utilizes a toxin, cercosporin, as its primary pathogenicity factor. Soybean rust (SBR), caused by Phakopsora pachyrhizi, is another common disease that occurs in Louisiana under cooler environmental conditions of spring and fall. Both diseases occur regularly in Louisiana and may result in severe yield losses. Cercospora kikuchii has recently …
Control Options For Rhizome Johnsongrass (Sorghum Halepense L. Pers.) In Glufosinate-Resistant Cotton (Gossypium Hirsutum L.) And Soybean (Glycine Max L. Merr.), Randall Lee Landry
Control Options For Rhizome Johnsongrass (Sorghum Halepense L. Pers.) In Glufosinate-Resistant Cotton (Gossypium Hirsutum L.) And Soybean (Glycine Max L. Merr.), Randall Lee Landry
LSU Master's Theses
Field studies were conducted in 2011, 2012, and 2013 near Alexandria, LA to determine glufosinate rates and timings for control of rhizome johnsongrass [Sorghum halepense (L.) Pers.] in glufosinate-resistant soybean [Glycine max (L.)Merr.]. Johnsongrass control (75%) and height reduction (63%) throughout the season were greatest when glufosinate was applied at 0.7 kg ai ha-1 followed by (fb) 0.6 kg ha-1. Furthermore, following initial applications of glufosinate at 0.7 kg ha-1 (2670 kg ha-1) increased soybean yields were observed compared to 0.5 kg ha-1 (2400 kg ha-1), and soybean yields were greater following sequential glufosinate applications of 0.6 kg ha-1 followed …
Effects Of Induced Plant Resistance And Potassium Fertilization Rates On Soybean Looper (Chrysodeixis Includens) Development In Soybean, Xuan Chen
LSU Master's Theses
Soybean looper, Chrysodeixis includens (Walker), is one of the most destructive pests of soybean in the southern U.S. It is highly resistant to most insecticides. Induced host plant resistance and cultural control are sought as alternative control tactics. In this study, effects of induced resistance by exogenous application of elicitors were estimated on soybean looper development in soybean. Three different known elicitors of SAR (systemic acquired resistance), Actigard 50WG (acibenzolar-S-methyl), Regalia (extract of Reynoutria sachalinensis) and methyl jasmonate (MeJA), were applied to soybean plants at R2 and R5 stages to determine if these chemicals could induce plant resistance and lower …
Use Of Harvest Aid In Soybean: Application Timing, Economics And Interactions In Ipm Programs, Joseph Michael Boudreaux
Use Of Harvest Aid In Soybean: Application Timing, Economics And Interactions In Ipm Programs, Joseph Michael Boudreaux
LSU Master's Theses
Indeterminate and determinate soybean (Glycine max (L). Merr.) cultivars were treated with the harvest aids, paraquat and sodium chlorate, when moisture of seed collected from the uppermost four nodes of plants averaged 60, 50, 40, 30, and 20% (+ or - 2%). Harvest aid application at 60% seed moisture reduced yield of the Maturity Group (MG) IV indeterminate cultivar 15%, but yield was not affected with application at 50% seed moisture. For MG V and MG VI determinate cultivars, application at 60 and 50% seed moisture reduced yield 4 to 22%, but yield was not affected when harvest aid was …