Risk assessment for pesticide resistance in sugar beet pathogens, pests and weeds

2018 ◽  
pp. 414-423 ◽  
Author(s):  
Mark Varrelmann ◽  
Bernward Märländer
Keyword(s):  
Risk Assessment ◽  
Sugar Beet ◽  
Agricultural Production ◽  
Resistance Mechanism ◽  
Resistance Management ◽  
Pesticide Resistance ◽  
Detailed Knowledge ◽  
Resistance Development ◽  
Major Threat ◽  
Management Plans

Resistance against pesticides in pathogens, pests and weeds has to be considered as a major threat to efficient agricultural production in general. This review compiles the basics of pesticide resistance development including important mechanisms, the factors and components of risk assessment and provides an overview of the most relevant sugar beet pathogens, pests and weeds as well as compounds currently used for their control that are threatened by resistance development. Only detailed knowledge about the pesticide mode of action, agronomic factors for its use, genetics/biology of target organisms and the resistance mechanism will enable to identify risks preferably before pesticide failure. The information assembled shall help to develop resistance management plans including tactics for specific prevention and management of resistance to maintain yield stability and allow sustainable intensification of sugar beet cultivation.

The role of nitrogen in transforming British agricultural productivity production prior to and during the First World War

2020 ◽  
Vol 13 (3) ◽  
pp. 583-609
Author(s):  
John Martin
Keyword(s):  
Agricultural Production ◽  
First World War ◽  
World War ◽  
Coal Gas ◽  
Major Threat ◽  
The First World War ◽  
Food Shortages ◽  
War Effort ◽  
First World

This paper explores the reasons why artificial or mineral sources of nitrogen, which were more readily available in Britain than in other European countries, were only slowly adopted by farmers in the decades prior to and during the First World War. It considers why nitrogen in the form of sulphate of ammonia, a by-product of coal-gas (town-gas) manufacture, was increasingly exported from Britain for use by German farmers. At the same time Britain was attempting to monopolise foreign supplies of Chilean nitrate, which was not only a valuable source of fertiliser for agriculture but also an essential ingredient of munitions production. The article also investigates the reasons why sulphate of ammonia was not more widely used to raise agricultural production during the First World War, at a time when food shortages posed a major threat to public morale and commitment to the war effort.

scholarly journals Cyanobacterial Toxins and Peptides in Lake Vegoritis, Greece

Toxins ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 394
Author(s):  
Sevasti-Kiriaki Zervou ◽  
Kimon Moschandreou ◽  
Aikaterina Paraskevopoulou ◽  
Christophoros Christophoridis ◽  
Elpida Grigoriadou ◽  
...  
Keyword(s):  
Public Health ◽  
Risk Assessment ◽  
Simultaneous Determination ◽  
Aquatic Ecosystems ◽  
Human Exposure ◽  
Bioactive Metabolites ◽  
Cyanobacterial Toxins ◽  
Major Threat ◽  
Almost All

Cyanotoxins (CTs) produced by cyanobacteria in surface freshwater are a major threat for public health and aquatic ecosystems. Cyanobacteria can also produce a wide variety of other understudied bioactive metabolites such as oligopeptides microginins (MGs), aeruginosins (AERs), aeruginosamides (AEGs) and anabaenopeptins (APs). This study reports on the co-occurrence of CTs and cyanopeptides (CPs) in Lake Vegoritis, Greece and presents their variant-specific profiles obtained during 3-years of monitoring (2018–2020). Fifteen CTs (cylindrospermopsin (CYN), anatoxin (ATX), nodularin (NOD), and 12 microcystins (MCs)) and ten CPs (3 APs, 4 MGs, 2 AERs and aeruginosamide (AEG A)) were targeted using an extended and validated LC-MS/MS protocol for the simultaneous determination of multi-class CTs and CPs. Results showed the presence of MCs (MC-LR, MC-RR, MC-YR, dmMC-LR, dmMC-RR, MC-HtyR, and MC-HilR) and CYN at concentrations of <1 μg/L, with MC-LR (79%) and CYN (71%) being the most frequently occurring. Anabaenopeptins B (AP B) and F (AP F) were detected in almost all samples and microginin T1 (MG T1) was the most abundant CP, reaching 47.0 μg/L. This is the first report of the co-occurrence of CTs and CPs in Lake Vegoritis, which is used for irrigation, fishing and recreational activities. The findings support the need for further investigations of the occurrence of CTs and the less studied cyanobacterial metabolites in lakes, to promote risk assessment with relevance to human exposure.

Prevention and Detection of Fungicide Resistance Development in Rhizoctonia zeae from Soybean and Corn in Nebraska

2021 ◽  
Author(s):  
Nikita Gambhir ◽  
Srikanth Kodati ◽  
Matthew Huff ◽  
Flávio Silva ◽  
Olutoyosi Ajayi-Oyetunde ◽  
...  
Keyword(s):  
Fungicide Resistance ◽  
Resistance Management ◽  
Dry Weight ◽  
Geographic Region ◽  
Population Characteristics ◽  
Current Status ◽  
In Planta ◽  
Resistance Development ◽  
Rhizoctonia Zeae

The goal of this research was to advance the foundational knowledge required to quantify and mitigate fungicide resistance in Rhizoctonia zeae, the seedling disease pathogen of soybean and corn. In vitro sensitivity to azoxystrobin, fludioxonil, sedaxane, and/or prothioconazole was determined for 91 R. zeae isolates obtained mostly from soybean and corn fields in Nebraska. Isolates were sensitive to fludioxonil, sedaxane, and prothioconazole (EC50 < 3 µg/ml) and had a positively skewed EC50 distribution. Isolates were not sensitive to azoxystrobin in vitro (EC50 > 100 µg/ml) or in planta. Application of azoxystrobin did not significantly decrease disease severity or improve total dry weight of the soybean plants (P > 0.05). The risk of resistance development in R. zeae was estimated by characterizing its population structure. Eighty-one R. zeae isolates were genotyped using six microsatellite markers. Results showed that the population has a mixed mode of reproduction and is structured according to geographic region, suggesting limited dispersal. These population characteristics suggest that R. zeae has an intermediate risk of resistance development. Overall, this research established the current status of fungicide sensitivity in R. zeae in Nebraska and estimated its risk of resistance development, which can inform fungicide resistance management for R. zeae.

scholarly journals Succinate dehydrogenase inhibitor (SDHI) fungicide resistance prevention strategy

2011 ◽  
Vol 64 ◽  
pp. 119-124 ◽  
Author(s):  
A.H. McKay ◽  
G.C. Hagerty ◽  
G.B. Follas ◽  
M.S. Moore ◽  
M.S. Christie ◽  
...  
Keyword(s):  
New Zealand ◽  
High Risk ◽  
Succinate Dehydrogenase ◽  
Fungicide Resistance ◽  
Fungal Pathogens ◽  
Resistance Management ◽  
Resistance Development ◽  
Development Of Resistance ◽  
Action Committee ◽  
Succinate Dehydrogenase Inhibitor

Succinate dehydrogenase inhibitor (SDHI) fungicides are currently represented in New Zealand by eight active ingredients bixafen boscalid carboxin fluaxapyroxad fluopyram isopyrazam penthiopyrad and sedaxane They are either currently registered or undergoing development in New Zealand for use against a range of ascomycete and basiodiomycete pathogens in crops including cereals ryegrass seed apples pears grapes stonefruit cucurbits and kiwifruit These fungicides are considered to have medium to high risk of resistance development and resistance management is recommended by the Fungicide Resistance Action Committee (FRAC) in Europe Guidelines are presented for use of SDHI fungicides in New Zealand to help avoid or delay the development of resistance in the fungal pathogens that they target

scholarly journals A high diversity of mechanisms endows ALS-inhibiting herbicide resistance in the invasive common ragweed (Ambrosia artemisiifolia L.)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ingvild Loubet ◽  
Laëtitia Caddoux ◽  
Séverine Fontaine ◽  
Séverine Michel ◽  
Fanny Pernin ◽  
...  
Keyword(s):  
Resistance Mechanism ◽  
Resistance Management ◽  
Genotyping By Sequencing ◽  
Ambrosia Artemisiifolia ◽  
Target Site ◽  
Major Type ◽  
Common Ragweed ◽  
Resistance Evolution ◽  
Arable Weed ◽  
Target Site Resistance

AbstractAmbrosia artemisiifolia L. (common ragweed) is a globally invasive, allergenic, troublesome arable weed. ALS-inhibiting herbicides are broadly used in Europe to control ragweed in agricultural fields. Recently, ineffective treatments were reported in France. Target site resistance (TSR), the only resistance mechanism described so far for ragweed, was sought using high-throughput genotyping-by-sequencing in 213 field populations randomly sampled based on ragweed presence. Additionally, non-target site resistance (NTSR) was sought and its prevalence compared with that of TSR in 43 additional field populations where ALS inhibitor failure was reported, using herbicide sensitivity bioassay coupled with ALS gene Sanger sequencing. Resistance was identified in 46 populations and multiple, independent resistance evolution demonstrated across France. We revealed an unsuspected diversity of ALS alleles underlying resistance (9 amino-acid substitutions involved in TSR detected across 24 populations). Remarkably, NTSR was ragweed major type of resistance to ALS inhibitors. NTSR was present in 70.5% of the resistant plants and 74.1% of the fields harbouring resistance. A variety of NTSR mechanisms endowing different resistance patterns evolved across populations. Our study provides novel data on ragweed resistance to herbicides, and emphasises that local resistance management is as important as mitigating gene flow from populations where resistance has arisen.

scholarly journals The Central Role of Multiple P450 Genes and Their Co-factor CPR in the Development of Permethrin Resistance in the Mosquito Culex quinquefasciatus

2022 ◽  
Vol 12 ◽  
Author(s):  
Youhui Gong ◽  
Ting Li ◽  
Qi Li ◽  
Shikai Liu ◽  
Nannan Liu
Keyword(s):  
Culex Quinquefasciatus ◽  
Resistance Mechanism ◽  
Gene Overexpression ◽  
Degradation Pathways ◽  
Cytochrome P450 Reductase ◽  
Major Threat ◽  
Development Of Resistance ◽  
Toxic Product ◽  
Resistant Strains

Mosquitoes’ increasing resistance to insecticides is becoming a major threat for control efforts worldwide. Multiple P450 genes that are up-regulated in permethrin resistant strains of Culex quinquefasciatus have been linked to the development of resistance. In the current study, we characterized the function of six P450 genes, CYP6P14, CYP6BZ2, CYP9J33, CYP9J34, CYP9J40, and CYP9J45, that are overexpressed in the permethrin resistant Culex mosquitoes and showed their capability in metabolism of permethrin. These six P450 genes can convert 3-phenoxybenzoic alcohol (PBCHO) to a less toxic product, 3-phenoxybenzoic acid (PBCOOH), indicating that these P450s play an important role in permethrin degradation pathways. Although we know multiple P450 genes are over-expressed in permethrin resistant Culex mosquitoes, it remains to be seen whether cytochrome P450-reductase (CPR) gene that are co-overexpressed with P450 genes in permethrin resistant mosquitoes do indeed serve as a resistance mechanism. An in-depth investigation of the expression of CPR gene in resistant mosquitoes was conducted in permethrin resistant mosquitoes. The finding of CPR gene overexpression in permethrin resistant mosquitoes suggested the importance of co-overexpression of multiple P450 genes with their obligatory electron donor CPR in the complex detoxification system, boosting the metabolism of permethrin and hence the development of permethrin resistance in Cx. quinquefasciatus.

scholarly journals Managing Insecticide and Miticide Resistance in Florida Landscapes

EDIS ◽  
2007 ◽  
Vol 2007 (19) ◽  
Author(s):  
Eileen A. Buss ◽  
James F. Price ◽  
Elzie McCord ◽  
Curtis Nagle
Keyword(s):  
Mode Of Action ◽  
Management Practices ◽  
Resistance Management ◽  
Resistance Development ◽  
Fact Sheet ◽  
Development And Management

ENY-824, a 10-page fact sheet by Eileen A. Buss, James F. Price, Elzie McCord, and Curtis Nagle, encourages landscape managers in Florida to implement resistance management practices. It provides definitions, discussions of resistance development and management, and the use of mixtures, rotations, and mosaics as strategies. Includes references and tables showing the mode of action of insecticides and miticides. Published by the UF Department of Entomology and Nematology, July 2007. ENY-842/IN714: Managing Insecticide and Miticide Resistance in Florida Landscapes (ufl.edu)

The Role of Irrigation in the Development of Agriculture

2016 ◽  
pp. 102-124
Author(s):  
Vesna Ž. Popović ◽  
Jonel V. Subić ◽  
Nataša Ž. Kljajić
Keyword(s):  
Sugar Beet ◽  
Agricultural Production ◽  
Irrigation System ◽  
Economic Benefits ◽  
Economic Effects ◽  
System Construction ◽  
Irrigation Policy ◽  
Pome Fruits ◽  
The Republic

The Srem district is home to producers of corn, oilseeds, sugar beet and tobacco, a leading region in the production of pome fruits (apples, pears) and drupes (plums, peaches, cherries) in the country and a perspective area for the development of organic plant and livestock production in protected areas. The current irrigation policy in the Republic of Serbia was not directed at systematic water use with the goal of forming an optimal structure of a market propulsive and a highly profitable agricultural production. The authors in the paper analyse the structure of agricultural production in the Srem district in Serbia and its market potentials as well as the economic effects of irrigation in light of the planned integral irrigation system construction in the Srem district in order to reflect economic benefits of irrigation and its role in the development of agriculture.

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