Maud Thomas

Maud Thomas
Unicoque · Association Nationale des Producteurs de Noisettes (ANPN)

PhD

About

21
Publications
3,192
Reads
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354
Citations
Citations since 2016
14 Research Items
148 Citations
20162017201820192020202120220510152025
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20162017201820192020202120220510152025
20162017201820192020202120220510152025

Publications

Publications (21)
Poster
Full-text available
To date, distinct codes and phenological scales are currently employed for monitoring the annual life cycle of a hazelnut. These scales works well in specific areas but do not translate well for a broader use. Thus, a universal scale adaptable to all areas will allow standardization of phenological monitoring for hazelnut. Two recently published ar...
Article
Palomena prasina (L.) (Hemiptera: Pentatomidae) and Gonocerus acuteangulatus (Goeze) (Hemiptera: Coreidae) are new pests in French hazel orchards (Corylus avellana L., Corylaceae). Knowing the symptoms in growing hazelnuts resulting from pests feeding on them is important for risk assessment and risk management. Insects were isolated in net sleeves...
Article
A wide range of hazelnut (Corylus avellana) cultivars are produced around the world. Cultivars are often listed by the time of bloom, from early to mid and late season. To date, phenological stages have been recorded using alphanumerical codes, although data analysis is difficult with such codes. This study converted the alphanumerical codes to ful...
Poster
Full-text available
A wide range of hazelnut cultivars (Corylus avellana) are produced around the world. Cultivars can be listed depending on the blooming period: from early to mid and late season cultivars. In the southwestern of France, little is known about the relationship between the blooming period and consequently, the dynamic of fruit growth (DFG). DFG is an a...
Article
To be competitive, the French hazelnut growers need to evaluate new hazelnut cultivars and their adaptability to contrasting environments in terms of water and mineral resources. The ability to use resources efficiently, including water (i.e. water use efficiency, WUE) can be studied at different levels such as at foliar level. To study WUE, it is...
Article
Full-text available
We report the first detection of Trissolcus mitsukurii in France. More than 1860 sentinel egg masses of Halyomorpha halys (BMSB) were exposed in the field during the 2018–2020 period, and 12 specimens of T. mitsukurii emerged from one egg mass. Their taxonomic identification was confirmed both by morphological and molecular analysis. Trissolcus mit...
Experiment Findings
The First mature leave has been determined in Hazelnut using several cultivated varieties This woks has been accepted for publication : J. Toillon, A. Paradinas, and M. Thomas. (2021). Growth and leaf morphology of hazelnut cultivars grown under semi-controlled conditions. European Journal of Horticultural Science. In Press.
Poster
Full-text available
La punaise diabolique, Halyomorpha halys (Stål, 1855) (Hémiptère: Pentatomidae) est une punaise originaire de l’Est Asiatique. En 2012, la punaise a été identifiée en Alsace. En 2016, la punaise est identifiée en Espagne. Plusieurs causes sont à l’origine de la progression rapide de la punaise. La forte polyphagie de cette punaise en est l’une des...
Article
The nut weevil, Curculio nucum (Linnaeus, 1758), is the main pest in hazelnut orchards (Corylus avellana L.). Semiochemicals are interesting bio control tools that could be used to manipulate the pest behaviour and to control pest populations. The study of the sensorial equipment of the insect antennae provides information on the importance of olfa...
Poster
Full-text available
BIOCONTROL OF HAZELNUT : AN APPLIED RESEARCH ACTION DEVOTED TO THE TWO MAJOR PESTS IN FRENCH HAZELNUT
Article
The pectin content, composition and physico-chemical properties were studied in the fruits of two genotypes of Japanese quince. On average, the fruits contained 11 g pectins/100 g dry fruit and 1.4 g pectins/100 g fresh fruit. A sequential extraction was used to isolate the pectins from the fruits. The cells from the flesh were examined using a con...
Article
A water-soluble cellulose acetate sulfate (CAS) with a degree of acetylation (DS(Ac)) 2.4 and a degree of sulfation (DS(Sulf)) of 0.3 was obtained by direct acetylation of cellulose using sulfuric acid as catalyst. Using methylation analysis, IR and NMR spectroscopy, sulfate groups have been located on primary alcohol function of glucose residues....
Article
Full-text available
An improved hplc method for the simultaneous determination of the degrees of methylation and acetylation of pectins has been developed. The proposed method involves saponification in heterogeneous medium followed by the separation of methanol, acetic acid and internal standard on a C18 column and quantification by refractometry. The method is repro...
Article
A combined enzymatic and HPLC method was validated for analysis of galacturonic acid (GalA) in (1) alcohol-insoluble solids (AIS), and in (2) pectins, extracted from fruits of Japanese quince (Chaenomeles japonica), by comparison with a standard colorimetric method (using metahydroxydiphenyl) for analysis of uronic acids (UA). For analysis of AIS,...
Article
The study of the cell-wall polysaccharides of the fruits of Japanese quince (Chaenomeles japonica) was achieved in two stages: (i) preparation of alcohol insoluble solids (AIS) from the different tissue zones and entire fruits of two genotypes and (ii) treatment of the AIS with extractants. The AIS represented an average of 32 g/100 g entire dry fr...
Article
The dietary fibre in the fruits of 12 genotypes of Japanese quince (Chaenomeles japonica) and 1 genotype of flowering quince (Chaenomeles speciosa) were prepared using two different methods: the alcohol insoluble solid (AIS) preparation; and the Association of Official Analytical Chemists (AOAC) method for total as well as for soluble and insoluble...
Article
In this paper, research on dietary fibre and cell-wall polysaccharides in chaenomeles fruits is reported and summarised. The dietary fibre in fruits of 12 genotypes of Japanese quince (Chaenomeles japonica) and 1 genotype of flowering quince (C. speciosa) was prepared using two different methods: the Alcohol Insoluble Solid (AIS) method; and the AO...

Network

    • research work while affiliated with The University of Arizona; Verigen Transplantation Service and other research centers
    • French National Institute for Agriculture, Food, and Environment (INRAE)
    • French National Institute for Agriculture, Food, and Environment (INRAE)
    • French National Institute for Agriculture, Food, and Environment (INRAE)
    • Université d'Orléans
Cited By

Projects

Projects (4)
Project
French hazel orchards are damaged by the green shield bug (GSB), Palomena prasina (Hemiptera: Pentatomidae). P. prasina is not exclusive to Corylus avellana. Adults and nymphs need to feed from different plant species. Plant diversity and habitats provided by hedges increase GSB population in orchards borders. Hedge composition could be a key issue between the pest and its natural enemies. Indeed, some plant species provide food sources and habitats for natural enemies. Current tendencies to reduce the application of chemical agro-protections lead to several ecofriendly strategies to reduce the GSB attacks to more acceptable levels. Plant management is one of them. Making the environment less suitable for the pest survival and more suitable for natural enemies should lead to pest population reduction. Indeed, (1) control of host plants can reduce the available resources for the GSB (i.e. fruits, pods and seed for adults) during its key life stages ; (2) reduction of alternative plant resources during the vegetative phase of hazel trees and competitive host plants during hazel fructifications may negatively impact edge GSB populations; (3) promoting plant species providing suitable food sources and habitats for natural enemies without supporting the pest species may reduce GSB populations. The project will aim at developing plant management solutions to reduce pest damages in hazel orchards by : (1) studying the dynamics of the populations according to plant diversity of hedges, (2) assessing the role of the host plants in the maintenance and/or in the dispersal of the pest, (3) identifying natural enemies and their hosts (such as parasites and parasitoids) and finally (4) studying the dispersal abilites of adults and nymphs in fields.
Project
Evaluation of growth, productivity and physiology of hazelnuts cultivars in France across a range of study sites.
Project
Test of chemical and biological products in order to reduce the impact of Curculio nucum on halzelnuts yield quality and quantity