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Lara De Backer, Rudy Caparros Megido, Éric Haubruge & François J. Verheggen

Macrolophus pygmaeus (Rambur) as an efficient predator of the tomato leafminer Tuta absoluta (Meyrick) in Europe. A review

(Volume 18 (2014) — numéro 4)
Article
Open Access

Document(s) associé(s)

Annexes

Notes de la rédaction

Received on June 21, 2013; accepted on May 28, 2014

Résumé

Macrolophus pygmaeus (Rambur), prédateur efficace de la mineuse de la tomate Tuta absoluta (Meyrick) en Europe (synthèse bibliographique). La mineuse de la tomate, Tuta absoluta (Meyrick), est considérée comme l’un des principaux insectes ravageurs des cultures de tomates en Amérique du Sud, d’où elle est originaire. Depuis son introduction sur le continent européen en 2006, les pays méditerranéens doivent également faire face aux infestations de ce nouveau ravageur. À cause du caractère endophyte des larves et de leur capacité à se reproduire par parthénogénèse, les méthodes de lutte chimiques et sémiochimiques ne sont pas totalement efficaces. L’utilisation d’insectes auxiliaires, tels que Macrolophus pygmaeus Rambur (Heteroptera : Miridae) représente une alternative explorée récemment et dont les résultats sont rassemblés dans cette synthèse bibliographique. En effet, M. pygmaeus est un prédateur de T. absoluta couramment utilisé dans les programmes de lutte contre plusieurs insectes phytophages. Les différentes études de laboratoire et de terrain qui lui sont dévolues reconnaissent toutes le grand potentiel de M. pygmaeus dans la lutte contre T. absoluta. Le prédateur est natif de la région paléarctique et colonise spontanément les serres de tomates de la région méditerranéenne. Des méthodes dites de conservation visent à améliorer la colonisation naturelle des prédateurs à l’aide de plantes refuges (i.e. plantes qui fournissent un habitat au prédateur). Quand la conservation n’est pas suffisamment efficace, des lâchers de prédateurs peuvent être effectués pour augmenter la population locale. Les lâchers se font soit en prévision des infestations ou en applications curatives. Les recommandations varient en fonction des densités de prédateurs et de ravageurs. Dans le but d’améliorer les résultats de la lutte biologique, il est possible de combiner M. pygmaeus avec d’autres moyens de lutte, que ce soit d’autres prédateurs ou parasitoides, ou des méthodes chimiques. L’ensemble des approches visant la lutte biologique contre T. absoluta à l’aide de M. pygmeus est présenté ici.

Mots-clés : contrôle biologique, Gelechiidae, gestion intégrée des ravageurs, insecte prédateur, Macrolophus, serre.

Abstract

The tomato leafminer, Tuta absoluta (Meyrick), originates from South America, and remains one of the main tomato pests in this continent. Since its introduction to Europe in 2006, Mediterranean countries have also been exposed to this pest. Because of the endophytic habits of the larvae and ability of adults to reproduce parthenogenetically, chemicals and sexual pheromone-based control methods generate poor results. Recently, the use of biocontrol agents, such as Macrolophus pygmaeus Rambur (Heteroptera: Miridae), has been investigated as an alternative means of control, the results of which are presented in this review. Macrolophus pygmaeus is a mirid bug that is widely used to control different phytophagous insects in integrated pest management strategies through Europe. Several studies have confirmed the high predation potential of M. pygmaeus on T. absoluta under laboratory and semi-field conditions. This predator spontaneously colonizes tomato greenhouses in the southern Mediterranean countries. The use of banker plants (i.e., plants that provide a habitat to the predator) improves the colonization ability of this natural enemy. Hence, if the local population size is low, an augmentative strategy could be adopted. Predators may be released before or after the onset of pest infestation, with recommendations varying depending on natural population densities of both the pest and predator. The efficiency of M. pygmaeus has also been evaluated when used in combination with other biocontrol agents or with chemicals. This work presents an overview of different types of control strategies using M. pygmaeus against the tomato leafminer, T. absoluta.

Keywords : biological control, Gelechiidae, greenhouses, integrated pest management, Macrolophus, predatory insects

1. Introduction

1The tomato leafminer moth, Tuta absoluta (Meyrick) [Lepidoptera: Gelechiidae], is currently considered as a serious agricultural threat to European tomato crops, causing losses of 80% to 100% in areas without control measures (Desneux et al., 2010; Desneux et al., 2011a). The pest pressure varies among the European countries, being higher in the Eastern Mediterranean countries while it has declined to medium levels in Western Mediterranean countries. In Northern European countries, infestations are limited to glasshouses (EPPO, 2011). This moth is 6–7 mm in length, and is native to South America, but was introduced to Spain in 2006. It has a reproduction rate of 10 to 12 generations a year under greenhouse conditions, facilitating the fast invasion of new territories (Desneux et al., 2010). The larvae of this moth preferentially develop on tomato plants (Solanum lycopersicum L.) (Desneux et al., 2010); however, larvae and adults may also feed and reproduce on a wide range of solanaceous plants (Caparros Megido et al., 2013a) and other plants such as cape gooseberry (Physalis peruviana L.), bean (Phaseolus vulgaris L.) and Malva sp. (Tropea Garzia et al., 2012). Immediately after egg hatching, the larvae consume the leaves and fruits creating galleries through the mesophyll layer, reducing the ability of plants to photosynthesize, which hinders plant development. These galleries also allow the entry of a diverse array of pathogens (Urbaneja et al., 2009; Desneux et al., 2010). The most common control method of this pest is the use of insecticides, such as abamectin, spinosad, tebufenozide, and chlorfenapyr (Lietti et al., 2005), and sex pheromones (Caparros Megido et al., 2013b). However, both control strategies generate poor or non lasting results (Michereff Filho et al., 2000; Hassan et al., 2009; Vacas et al., 2011). For instance, the efficacy of the sex pheromone strategies is negatively affected by the ability of T. absoluta females to reproduce parthenogenetically (Caparros Megido et al., 2012), while the endophytic (i.e., ability to live within the plant) nature of the larvae reduces the effectiveness of insecticides (Lietti et al., 2005). Moreover, the larvae quickly develop resistance to insecticides (Guedes et al., 2012). Consequently, other strategies are being investigated such as the use of entomopathogenetic nematodes (Batalla-Carrera et al., 2010), Bacillus thuringiensis Berliner (González-Cabrera et al., 2010) or sterile male techniques (Cagnotti et al., 2012). Among those strategies under evaluation, a promising alternative form of pest management is the use of biocontrol agents (Desneux et al., 2011b; Cabello et al., 2012; Zappalà et al., 2013).

2Macrolophus pygmaeus Rambur (Heteroptera: Miridae) is a mirid bug that occurs in the Palaeartic region (Sanchez et al., 2012), and is considered as a principal natural enemy of tomato pests in this region (Perdikis et al., 2011). This bug is a highly polyphagous predator, and is already used as a biocontrol agent against various phytophagous insect pests under greenhouse conditions (Nannini et al., 2012). Both nymphs and adults have piercing-sucking mouthparts, and feed on whitefly eggs, aphids, mites, thrips, and moth eggs (Albajes et al., 2002; Perdikis et al., 2008).

3The taxonomy of some Macrolophus spp. has been discordant and very dynamic. Macrolophus pygmaeus and Macrolophus melanotoma (Costa) are sympatric species and cryptic owing to their very similar morphology. These two species differ mainly for few and variable features, such as the lateral band behind the eye and differ in the color pattern of the first antennal segment, being white and black in M. melanotoma and entirely black in M. pygmaeus (Castañé et al., 2013). Moreover, according to the synonimization by Carapezza (1995), M. melanotoma was often quoted its synonym M. caliginosus (Wagner). To clarify the situation, researchers have developed molecular techniques and resolved this misidentification using an integrative approach such as crossing experiments, multivariate morphometry and mitochondrial DNA analysis (Perdikis et al., 2003; Martinez-Cascales et al., 2006; Machtelinckx et al., 2009; Castañé et al., 2013; Evangelou et al., 2013). It is now an admitted fact that the predators commercially available for biological control are M. pygmaeus (Castañé et al., 2013). In the following studies, data have been obtained for Macrolophus caliginosus, but will be treated in this review as M. pygmaeus: Arnò et al. (2003), Castañé et al. (2004), ), Castañé et al. (2007), Malausa et al. (1987), Sampson et al. (1999), Tedeschi et al. (2001) and Van Schelt et al. (1996).

4This review summarizes available data about M. pygmaeus in the particular event of T. absoluta biocontrol. The review discusses laboratory and field assay results as well as current information on the relation between the predator and its pest.

5An extensive review of the literature has been performed using SCOPUS database, using all keywords associated with the title and abstract, including the biological materials and methods presented in this review.

2. Natural occurrence of M. pygmaeus in open fields and greenhouse colonization

6Macrolophus pygmaeus is native to the Paleartic ecozone. It is distributed from Finland to Algeria, the Azores Islands, and Tajikistan (Sanchez et al., 2012). In Spain, M. pygmaeus is among the most abundant natural enemies of T. absoluta (Arnó et al., 2009). During the winter, M. pygmaeus is found inhabiting potato crops and non-agricultural plants, such as Dittrichia viscosa (L.) Greuter, Cistus spp., and Parietaria officinalis L.; however, in spring the bug moves from these species to colonize agricultural crops (Gabarra et al., 2004). In southern Greece, M. pygmaeus occurs from early summer to late autumn in the fields (Lykouressis et al., 2008).

7Macrolophus pygmaeus is considered as a natural enemy of T. absoluta in southern France, where it was the most abundant predator on tomato (Biondi et al., 2013), Algeria (Guenaoui et al., 2011), Iran (Baniameri et al., 2011) and Spain (Urbaneja et al., 2012).

8Greenhouses in the Mediterranean region (southern Palearctic ecozone) are generally made of plastic, with roll-up sides for ventilation, which allows the exchange of insects with the outside environment. Insects tend to colonize greenhouses at the end of spring in western Mediterranean countries, where insecticides are not applied. In Spain, Castañé et al. (2004) monitored insect infestations in 14 greenhouses, and found that at the end of the tomato crop period (i.e., the start of July), all plants were colonized by two species of mirid bugs, Dicyphus tamaninii Wagner (Heteroptera: Miridae) and M. pygmaeus. The latter species represented 74% of all inventoried insects. The presence of tomato plants in the greenhouse, or in the general vicinity, led to higher numbers of individuals (Castañé et al., 2004). This phenomenon has also been documented in Italy, Greece, France, and the Canary Islands (Malausa et al., 1987; Perdikis et al., 1996; Tavella et al., 1997; Carnero et al., 2000). However, those investigations were conducted before T. absoluta invasions in this area. The situation might have slightly changed since then.

3. Laboratory and field evidence of M. pygmaeus preying on T. absoluta

9Several laboratory experiments have been conducted to evaluate the ability of M. pygmaeus to prey on T. absoluta. Under laboratory conditions, starved M. pygmaeus preyed on over 30 T. absoluta eggs daily (Urbaneja et al., 2009). The predation rate recorded in this experiment was higher compared to that reported on other lepidopteran prey, such as Helicoverpa armigera Hübner (Lepidoptera: Noctuidae), 20 eggs, probably because of the smaller size of T. absoluta eggs (Urbaneja et al., 2009). Arnó et al. (2009) reported a predation exceeding 100 T. absoluta eggs per M. pygmaeus adult and per day. Chailleux et al. (2013a) also showed the active predation of M. pygmaeus on T. absoluta. Macrolophus pygmaeus shows a type II functional response; namely, the predation rate increases with the offered prey density leveling off to a plateau at higher densities. More M. pygmaeus females than males preyed on T. absoluta, with this difference between the sexes becoming stronger with increasing prey density (Urbaneja et al., 2009).

10Urbaneja et al. (2009) also investigated under laboratory conditions the predation rate of M. pygmaeus on different T. absoluta instars. Although it is able to feed on all developmental stages, M. pygmaeus preferentially feeds on first instars (Mollá et al., 2009; Urbaneja et al., 2012), with a mean number of two first instar larvae being eaten per day (Urbaneja et al., 2009). Arnò et al. (2003) obtained the same predation rate when M. pygmaeus preyed on third and second instars of Liriomyza trifolii Burgess (Diptera: Agromyzidae). These larvae are of similar size to the first instar larvae of T. absoluta (Urbaneja et al., 2009). Jaworski et al. (2013) investigated M. pygmaeus preference between T. absoluta and Bemisia tabaci Gennadius (Homoptera: Aleyrodidae) using entire tomato plants. The results showed a similar preference between whitefly nymphs and leafminer eggs, but a lower predation rate on leafminer larvae. Adult predators showed a higher predation rate than juveniles. The presence of the leafminers increased adult predation on both pests and decreased juvenile predation. However, these results are obtained by laboratory investigations and may vary under field conditions. Bompard et al. (2013) showed a beneficial effect of M. pygmaeus on the tomato leafminer in the greenhouse. The study assessed predator-mediated interactions between two pests, T. absoluta and B. tabaci in greenhouse, by monitoring the pest and predator populations when released on crops either separately or combined. They showed that the predator significantly reduced both pest populations separately, 30-fold for adult whiteflies and 3.7-fold for the leafminer (Bompard et al., 2013).

4. Biological control using M. pygmaeus

4.1. Conservation: colonization improvement

11Conservation biological control consists in habitat manipulation to enhance the action of endemic or exotic natural enemies (Gurr et al., 1999). Usually, predator occurrence is related to the occurrence of target prey. Being zoophytophagous, M. pygmaeus offers the advantage of remaining on the crop, even when prey insects are scarce. The plants have a major influence on the survival of M. pygmaeus (Ingegno et al., 2011). To effectively establish the population of this predator in the crop, one or several alternative host plants could be planted near the crop requiring protection. These banker plants could also enable the bug population to remain in the vicinity between two crop cycles (Parolin et al., 2012).

12Solanum nigrum L. is a major host for M. pygmaeus (Perdikis et al., 2006; Lykouressis et al., 2008; Ingegno et al., 2011). Macrolophus pygmaeus completes its developmental cycle by feeding exclusively on this plant species, although its fecundity is lower than when also feeding on insect prey (Perdikis et al., 2006; Lykouressis et al., 2008). In Crete, M. pygmaeus is also abundant on many non-cultivated plants, including Dimorphotheca aurantiaca DC., Cistus creticus L., Amaranthus blitum L., and Datura stramonium L. (Roditakis et al., 2003). In Italy, large numbers of M. pygmaeus are found on Artemisia vulgaris L. (Ingegno et al., 2009).

13Ingegno et al. (2011) investigated the fitness of M. pygmaeus inhabiting different plants, and plant preferences based on olfactometric assays. The plants selected for the study had been previously reported as host plants for Dicyphini, in Piedmont, Italy (Ingegno et al., 2009), and are common in Italy where the experiment was conducted. Capsicum annuum L., Calendula officinalis L. and S. nigrum allowed the predator to survive longer without prey than Salvia officinalis L. and P. officinalis. The predator reached the fourth instar on the first three plants while it died before the second instar on the last two plants. Parietaria officinalis was the least attractive plant to M. pygmaeus, but still served as a suitable refuge in the absence of tomato crops (Ingegno et al., 2011). Alomar et al. (2006) reported a high number of predators on C. officinalis in fields confirming the potential of this plant. Hilly landscapes might also favor the entry of this predator into greenhouses (Gabarra et al., 2004).

4.2. Augmentative strategy

14Augmentative strategies are based on the release of predators into greenhouses to increase their numbers. This method is widely used for M. pygmaeus in the Mediterranean basin. This species has been commercially available since 1994 for use in integrated pest management (IPM) programs, and is being increasingly used in European tomato greenhouses (Castañé et al., 2011). Although M. pygmaeus is a zoophytophagous mirid, it only damages crops at very high population densities and when preys are scarce (Van Schelt et al., 1996; Castañé et al., 2011). Sampson et al. (1999) reported the only case of damages caused by the predator, and highlighted the fact that the number of individuals is a factor influencing the importance of damage. Here, two alternative augmentative strategies are described. The inundative strategy aims to suppress the pest by releasing a large amount of biocontrol agents. The inoculation strategy aims to establish the predator population on the crop before pest infestation. The initial number of predators that are released should be evaluated to reach a sufficient population size before pest establishment. If the pests begin to damage the plants, more natural enemies must be released within the framework of the second strategy.

15Alternative food sources, such as Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) eggs and Artemia cysts may be provided to M. pygmaeus to accelerate population growth (Perdikis et al., 2008; Put et al., 2012). Indeed, Mollá et al. (2014) proved that the progeny production of the predator feeding on a diet based exclusively on T. absoluta and tomato plants in laboratory conditions, was too low to lead to a significant and stable population. Similar observations have been made in the field (Bompard et al., 2013).

16A semi-field experiment was conducted in tomato greenhouses, and showed that M. pygmaeus inoculation reduced leaflet and fruit infestation of T. absoluta by up to 76% and 56%, respectively (Mollá et al., 2009). In Sardinian greenhouses, the weekly application of two M. pygmaeus per m² allowed the infesting T. absoluta population to be controlled (Nannini et al., 2012). In north-east Spain, where T. absoluta causes major damage, one to two M. pygmaeus adults per m² are released in greenhouses, when natural predator populations are low (Urbaneja et al., 2012).

17Macrolophus pygmaeus may also be released at the early stages of crop growth, even before transplanting the plant crop to the greenhouse (Trottin-Caudal et al., 2012). Adult predators are released on the seedlings, and initially fed with Ephestia eggs. The eggs laid by M. pygmaeus hatch very soon after transplantation, allowing population growth to start earlier (Trottin-Caudal et al., 2012).

4.3. Integration in IPM schemes

18The use of a natural enemy in combination with other biological control agents, predators and parasitoids, or chemical insecticide treatments is also common, and may help attain higher levels of effectiveness.

19In Spain, an IPM program based on the combination of M. pygmaeus and Nesidiocoris tenuis Reuter (Heteroptera: Miridae) has been used for many years (Urbaneja et al., 2012). Nesidiocoris tenuis is also a predator of T. absoluta which allows to provide higher leaflet and fruit damage reduction than M. pygmaeus (Mollá et al., 2009), although this predator naturally occurs only in southern countries (Urbaneja et al., 2012). Arnó et al. (2009) evaluated the effectiveness of the IPM program based on the augmentation and conservation of both mirid predators, compared to a conventional plant protection strategy based on insecticide use, in tomato greenhouses and open field. The number of T. absoluta, and the percentage of damaged plants and young fruits were significantly lower in greenhouses and open fields treated with the IPM program. Damage was reduced by 80% on leaves and by 95% on young fruit using the IPM program compared to the conventional strategy (Arnó et al., 2009). The use of two combined predators can lead to intraguild predation (IGP). Indeed, N. tenuis adults may kill juveniles of M. pygmaeus (Perdikis et al., 2014). Moreno-Ripoll et al. (2012) studied the interactions between both predator species under laboratory conditions. Female N. tenuis only showed predation behavior towards M. pygmaeus. When adult females of both predators were exposed to each other without additional prey, progeny of both predators was reduced. Perdikis et al. (2014) studied these interactions on entire plants revealing that M. pygmaeus and N. tenuis do not share the same location on the plant. When they are forced to share the same plant material, and in the absence of prey, young M. pygmaeus did not reach the adult stage. Selective insecticides, mainly based on Bacillus thuringiensis, were recommended to complement the IPM mirid based program (Urbaneja et al., 2012).

20Macrolophus pygmaeus keeps pest numbers below the damage threshold when chemicals are reduced (Perdikis et al., 2011). Arnó et al. (2011) investigated the impact of azadirachtin, spinosad, and indoxacarb on M. pygmaeus. Adult female mortality rates were higher with indoxacarb compared to azadirachtin and spinosad. A detrimental effect on the metamorphosis of nymphs was not observed. Nymphs treated with spinosad had fewer offspring as female adults compared to untreated nymphs. No insecticidal effect of spinosad was reported on the adult predator. Azadirachtin causes high mortality to M. pygmaeus in Petri dishes (Tedeschi et al., 2001). However, azadirachtin residues on plants did not affect female adults, or the third or fourth instars. Exposure to azadirachtin in the final days of preimaginal development reduced offspring numbers by 46% (Tedeschi et al., 2001) or 27% (Arnó et al., 2011). In brief, indoxacarb causes mortality, whereas azadirachtin and spinosad reduce offspring numbers through sublethal effects (Biondi et al., 2012; Desneux et al., 2007 for a through review). Azadirachtin and indoxacarb are classified as being slightly harmful to M. pygmaeus according to the International Organisation for Biological Control (IOBC) toxicity classes, whereas spinosad is classified as moderately harmful (Arnó et al., 2011).

21Trottin-Caudal et al. (2012) investigated the combination of M. pygmaeus and the egg parasitoid Trichogramma acheae Nagaraja and Nagarkatti (Hymenoptera: Trichogrammatidae) to control the tomato leafminer, in greenhouses in France. The experiment compared the effectiveness of both biocontrols alone and combined. A density of one adult predator per plant was introduced in the plant nursery 10 days before planting. In addition, two M. pygmaeus adults per m2 were released in the crop, 8 and 15 days after planting. The parasitoids were introduced as parasitized E. kuehniella eggs at a density of 25 individuals per m² eight times during three months after planting. Plant damage was reduced to a similar extent by each of M. pygmaeus and T. acheae alone. However, the best protection level was achieved when both agents were released simultaneously (Trottin-Caudal et al., 2012). Similar results were achieved in microcosms assays (Chailleux et al., 2013a) and in greenhouse cages (Chailleux et al., 2013b).

22To reach better control levels with two combined biocontrol agents, intraguild predation (IGP) must be avoided. Macrolophus pygmaeus does not attack T. acheae directly but may decrease the control level if IGP occurs on parasitized eggs. Chailleux et al. (2013a) tested the preference of M. pygmaeus between parasitized and unparasitized eggs in no-choice and double-choice assays. Two parasitized egg stages were included in the test, the newly parasitized eggs, which remain yellow, coloured and 4-5 days parasitized eggs which turn to black. In a no choice situation, the predator fed at the same rate on unparasitized and newly parasitized eggs and at a lower rate on old parasitized eggs. In a choice situation, no preference between yellow and unparasitized eggs was observed, but fewer eggs were consumed when black eggs were offered (Chailleux et al., 2013a).

23Macrolophus pygmaeus is a valuable agent to control T. absoluta in an IPM program if no broad spectrum insecticides are used (Arnó et al., 2009). Predator releases in nursery plants are the first step to ensure a good establishment of the population (Trottin-Caudal et al., 2012). On the crop, inoculations of 1-2 adults per m² can be applied (Trottin-Caudal et al., 2012; Urbaneja et al., 2012) and the environment can be manipulated to attract predators from outside or make the population build up easier (Perdikis et al., 2011). Also, E. kuehniella eggs can help building up the population faster (Perdikis et al., 2008; Put et al., 2012; Mollá et al., 2014). In southern countries, N. tenuis and T. acheae can be used in combination with M. pygmaeus to increase the impact of each agent when used alone (Arnó et al., 2009; Trottin-Caudal et al., 2012; Chailleux et al., 2013a). In northern countries, where temperatures are too low for the development of T. acheae and N. tenuis (Urbaneja et al., 2012), B. thuringiensis based formulations can be reasonably used (González-Cabrera et al., 2010; Urbaneja et al., 2012).

5. Perspectives

24When searching for insect hosts or prey, predators and parasitoids have been shown to rely on host plant and prey related odorant cues. The use of these semiochemicals in pest management is a rapidly growing field of research (Arab et al., 2007; Moayeri et al., 2007). Macrolophus pygmaeus has been shown to be attracted to herbivore induced volatiles (HIPVs) emitted by sweet pepper (C. annuum) that had been infested by two pests Tetranychus urticae Koch (Acari: Tetranychidae) and Myzus persicae Sulzer (Homoptera: Aphididae) (Moayeri et al., 2007). Macrolophus pygmaeus is also attracted to tomato plants infested by whiteflies, whereas whiteflies alone do not attract the predator (Ingegno et al., 2011). At present, the attraction of this predator by HIPVs induced by T. absoluta has not been investigated. If the compounds responsible for the attraction of M. pygmaeus could be identified, they could be incorporated into integrated biocontrol strategies focusing at attracting the predators from natural populations occurring outside the greenhouses, guiding them into the greenhouses to infestation hotspots.

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Pour citer cet article

Lara De Backer, Rudy Caparros Megido, Éric Haubruge & François J. Verheggen, «Macrolophus pygmaeus (Rambur) as an efficient predator of the tomato leafminer Tuta absoluta (Meyrick) in Europe. A review», BASE [En ligne], Volume 18 (2014), numéro 4, 536-543 URL : https://popups.uliege.be/1780-4507/index.php?id=11671.

A propos de : Lara De Backer

University of Liege - Gembloux Agro-Bio Tech. Unit of functional and evolutionary Entomology. Passage des Déportés, 2. B-5030 Gembloux (Belgium).

A propos de : Rudy Caparros Megido

University of Liege - Gembloux Agro-Bio Tech. Unit of functional and evolutionary Entomology. Passage des Déportés, 2. B-5030 Gembloux (Belgium).

A propos de : Éric Haubruge

University of Liege - Gembloux Agro-Bio Tech. Unit of functional and evolutionary Entomology. Passage des Déportés, 2. B-5030 Gembloux (Belgium).

A propos de : François J. Verheggen

University of Liege - Gembloux Agro-Bio Tech. Unit of functional and evolutionary Entomology. Passage des Déportés, 2. B-5030 Gembloux (Belgium). E-mail: fverheggen@ulg.ac.be