Patricia C. Fernandez's research while affiliated with THE UNIVERSITY OF BAMENDA and other places

Publications (54)

Article
Fruit fly pests (Diptera: Tephritidae) are a serious problem for fruit production and for local and international trade. Biological control is increasingly included as a pest control tool within integrated pest management (IPM) programmes, seeking to reduce pesticides and improve fruit quality. Ceratitis capitata Wiedemann, the Mediterranean fruit...
Article
Leaf‐cutting ants (LCAs) cause significant damage to forest plantations and are mainly managed by broad‐spectrum synthetic insecticides. In Patagonia, Pinus ponderosa (Pinales: Pinaceae) (Douglas 1836) and Pinus contorta (Pinales: Pinaceae) (Dluglas 1838) are the predominant pine species in forest plantations. Previous research has shown that dehyd...
Article
Full-text available
BACKGROUND Sirex noctilio is an invasive forest wasp that affects pines and can result in severe economic losses. The use of semiochemicals offers an opportunity to develop sensitive and specific capturing systems to mitigatenegative impacts. Previous research showed that female S. noctilio would use volatiles emitted by its fungal symbiont, Amylos...
Article
Full-text available
We evaluated the induction of plant volatile organic compounds (VOCs) in maize after the attack of two piercing-sucking maize hoppers: the specialist Dalbulus maidis and the oligophagous Peregrinus maidis. We analyzed VOCs in plants after feeding and oviposition by females of both species. We also contrasted VOCs induced by D. maidis males with tho...
Article
Full-text available
Most cool season grasses are commonly associated with asexual endophytes and arbuscular mycorrhizal fungi (AMF). These two symbionts are known to provide different benefits to the host plant through altering its phenotype when they are present. In isolation, either of them can affect the volatile organic compounds (VOCs) emitted by the host grass,...
Article
Full-text available
Anastrepha fraterculus sp.1 males are sexually stimulated by the aroma of fruit of its native host Psidium guajava (guava). Other hosts, which are exotic to A. fraterculus, do not enhance male sexual behavior. Here we evaluate the effects of fruit volatile exposure on male A. fraterculus sp. 1 sexual performance using other native hosts, under the...
Article
Full-text available
Introduction Insect oviposition can enhance plant defenses and decrease plant quality in response to future feeding damage by hatched larvae. Induced resistance triggered by egg deposition and its negative effect on insect herbivore performance is known for several annual plants but has been much less studied in woody perennials, such as species of...
Article
Full-text available
In some tephritid fruit flies, exposure to volatile compounds from host plants increases male sexual success. This phenomenon has been used to boost sterile males’ sexual competitiveness in the framework of the sterile insect technique (SIT). Previous studies revealed that males of Anastrepha fraterculus (Diptera: Tephritidae) exposed to volatiles...
Article
Full-text available
Over the last decades, Argentine and Brazilian farmers have adopted no‐tillage cultivation systems and multiple cropping, which have decreased the abundance of traditional pests, such as Nezara viridula, and favored the development of some stink bugs of secondary importance, like Dichelops furcatus, D. melacanthus and Euschistus heros. No‐till farm...
Preprint
Full-text available
Parasitoids are known to exploit volatile cues emitted by plants after herbivore attack to locate their hosts. Feeding and oviposition of a polyphagous herbivore can induce emission of odor blends that differ among distant plant species, and parasitoids have evolved an incredible ability to discriminate them and locate their hosts relying on olfact...
Article
Full-text available
Finding ways to improve the sexual competitiveness of laboratory reared males have proven beneficial for the sterile insect technique. Exposure to essential oils enhances male mating success in several species of Tephritidae fruit flies. In Anastrepha fraterculus, males exposed to volatile compounds released by fresh guava fruit exhibit an increase...
Article
Varroa destructor Anderson & Trueman (Acari: Varroidae) is one of the major contributors to the significant losses of western honey bee, Apis mellifera L. (Hymenoptera: Apidae), colonies worldwide. Hygienic behavior, in which individual workers detect, uncap, and remove unhealthy brood, is a type of social immunity that reduces pathogen and parasit...
Article
Vertically transmitted fungal endophytes are common defensive symbionts of cool-season grasses. Protection against herbivores has been generally associated with alkaloids produced in the grass-endophyte symbiosis. However, many other changes occur in host metabolism like the release of VOCs. We aimed at characterizing the profile of volatile organi...
Article
Full-text available
BACKGROUND Recently, in temperate and neotropical regions of South America the generalist stink bug Dichelops furcatus (Hemiptera: Pentatomidae) became a new pest of corn (Zea mays) seedlings. Implementation of no‐tillage cultivation system left organic matter covering the soil, which shelters adults of stink bugs during winter. In spring, corn is...
Article
Full-text available
Following damage by herbivores, many plants release volatiles that dissuade future conspecifics from feeding. In many crop plants however, induced volatiles mediating this kind of interactions among plants, herbivores and also their natural enemies have been altered through the process of domestication. The selection of crops for increased yield ma...
Article
Full-text available
BACKGROUND Leaf‐cutting ants (LCAs) are amongst the most important forestry pests in South America. Currently, their control is carried out almost exclusively through the application of toxic baits of restricted use. Here we evaluate a push‐pull strategy (i.e., the simultaneous use of attractant and repellent stimuli in order to divert pests) to ma...
Article
Full-text available
Background: The interaction between gut bacterial symbionts and Tephritidae became the focus of several studies that showed that bacteria contributed to the nutritional status and the reproductive potential of its fruit fly hosts. Anastrepha fraterculus is an economically important fruit pest in South America. This pest is currently controlled by...
Conference Paper
Full-text available
Resumen: Las hormigas cortadoras de hojas (HCH), consideradas ingenieras del ecosistema, son plaga en producciones forestales (monocultivos). Su manejo es casi exclusivamente mediante la aplicación de cebos tóxicos prohibidos en muchos países. El objetivo de este trabajo fue identificar, evaluar y seleccionar herramientas para ser utilizadas en un...
Article
Full-text available
Leaf-cutting ants are insects of great economic importance which cause economic losses in numerous crops. Compounds that modulate behaviour, and among these natural repellents, show promise in integrated pest management strategies. Tea tree oil has been found to be repellent to certain insect pests, so this study aimed at identifying the effect of...
Article
Full-text available
Leaf-cutting ants are considered major pests of agriculture and forestry in the Neotropics. Attractive toxic baits are the prevailing method for managing them. Thus, there is great interest in identifying attractants to incorporate into these baits. Moreover, leaf-cutting ants can avoid toxic baits by associating the attractant with the toxin. We e...
Article
Full-text available
Exposure to plant compounds and analogues of juvenile hormone (JH) increase male mating success in several species of tephritid fruit flies. Most of these species exhibit a lek mating system, characterized by active female choice. Although the pattern of enhanced male mating success is evident, few studies have investigated what benefits, if any, f...
Article
Full-text available
After an insect herbivore has reached its host plant, contact cues from the leaf surface often determine host acceptance. We studied contact cues during oviposition behavior of a willow pest, the sawfly Nematus oligospilus (Hymenoptera: Tenthredinidae), a specialist feeder on Salix (Salicaceae) trees, and how it determines oviposition preference in...
Preprint
Full-text available
Exposure to plant compounds and analogues of juvenile hormone (JH) increase male mating success in several species of tephritid fruit flies. Most of these species exhibit a lek mating system, characterized by active female choice. Although the pattern of enhanced male mating success is evident, few studies have investigated what benefits, if any, f...
Article
Volatile organic compounds (VOCs) released by plants are generally involved in host recognition and host selection for many phytophagous insects. However, for leafhoppers and planthoppers, host recognition is mainly thought to involve a phototactic response, but it is not clear if a host plant could be selected based on the volatile cues it emits....
Poster
Full-text available
La hormiga negra común (Acromyrmex spp) es una de las principales plagas en el momento de la plantación. En 2014 se instaló un ensayo en la EEA Delta del Paraná (INTA), utilizando los clones de sauce 'Agronales INTA-CIEF'; 'Lezama INTA-CIEF'; 'Los Arroyos INTA-CIEF', "98.11.01" y "94.08.43". Como material de propagación se utilizaron guías de un añ...
Conference Paper
Full-text available
Biodiversidad como estímulo atrayente para hormigas cortadoras de hojas en una estrategia Push-Pull en el Delta del Paraná Las hormigas cortadoras de hojas cumplen diversas funciones en los ecosistemas naturales. Sin embargo, pueden tornarse perjudiciales en sistemas productivos, por la simplificación de la vegetación. En zonas de monocultivo de sa...
Conference Paper
Full-text available
Leaf cutting ants are insects of importance in natural ecosystems. However, due to simplification of agroecosystems, leaf cutting ants have become serious pests, especially in young forestry plantations. In the case of willow plantations, currently, the main control method is the use of broad spectrum insecticides, which is not always efficient and...
Article
Full-text available
Plant compounds affect insects in many different ways. In addition to being a food source, plants also contain secondary metabolites that may have positive and negative impacts on insects. The influence of these compounds on sexual behavior, in particular, has been the focus of many recent studies. Here, we review the existing literature on the eff...
Preprint
Background: The interaction between gut bacterial symbionts and Tephritidae became the focus of several studies that showed that bacteria contributed to the nutritional status and the reproductive potential of its fruit fly hosts. Anastrepha fraterculus is an economically important fruit pest in South America. This pest is currently controlled by i...
Conference Paper
Full-text available
Las hormigas cortadoras de hojas son de gran importancia por la diversidad de funciones que cumplen en los ecosistemas naturales. Sin embargo, pueden tornarse perjudiciales en sistemas productivos, por la simplificación de la diversidad que favorece el establecimiento y crecimiento excesivos de poblaciones de hormigas. En la zona de monocultivo de...
Article
Full-text available
Leaf-cutting ants are considered major pests of agriculture and forestry in the Neotropics. Attractive toxic baits are the prevailing method for managing them. Thus, there is great interest in identifying attractants to incorporate into these baits. Moreover, leaf-cutting ants can avoid toxic baits by associating the attractant with the toxin. We e...
Article
Full-text available
Greater knowledge on the social communication of invasive Vespula germanica wasps is needed to fully understand their foraging behavior. This is particularly valuable considering that poison baiting is currently the only effective way of reducing wasp density. Heptyl butyrate is an attractant for many wasp species, but attempts to determine effects...
Presentation
Full-text available
La diversidad biológica es importante para el funcionamiento de los ecosistemas. Utilizada de forma planificada dentro de un cultivo, ofrece diferentes mecanismos para el control de plagas, disminuyendo el ataque y aumentando la presencia de enemigos naturales o de competidores. Las plantaciones forestales son grandes extensiones de monocultivos, q...
Poster
Full-text available
Las hormigas cortadoras del género Acromyrmex son consideradas plaga para muchos tipos de cultivos. Comúnmente se controlan con cebos tóxicos que tienen como base atrayente a la naranja Citrus sinensis. Con el fin de mejorar la eficiencia de atracción de esta fruta, hemos realizado ensayos en laboratorio de la preferencia de Acromyrmex ambiguus por...
Article
Full-text available
Leaf-cutting ants are a serious pest of young forestry plantations. Currently, the main control method is the use of broad-spectrum insecticides, which have a negative effect on non-target organisms and the environment. In this work, plant-based compounds were evaluated in laboratory assays with Acromyrmex ambiguus Emery (Hymenoptera: Formicidae) f...
Article
Natural odors are typically mixtures of several chemical components. Mixtures vary in composition among odor objects that have the same meaning. Therefore a central 'categorization' problem for an animal as it makes decisions about odors in natural contexts is to correctly identify odor variants that have the same meaning and avoid variants that ha...
Article
Full-text available
The study of sexual behavior and the identification of the signals involved in mate recognition between con-specifics are key components that can shed some light, as part of an integrative taxonomic approach, in delimitating species within species complexes. In the Tephritidae family several species complexes have received particular attention as t...
Article
Full-text available
Plant volatile organic compounds play a role in selection of host plants by herbivorous insects. Once the insect reaches the plant, contact cues determine host acceptance. Although the willow sawfly Nematus oligospilus (Hymenoptera: Tenthredinidae) can differentiate among willow genotypes, no knowledge is available on the cues used by this insect t...
Poster
Full-text available
La vegetación de crecimiento espontáneo, llamada “maleza” es considerada perjudicial para las plantaciones de sauce y álamo. Las hormigas cortadoras de hojas (Acromyrmex sp.) son una de las plagas más importantes en la producción de Salicáceas y son combatidas con insecticidas de síntesis que contaminan el ambiente. El objetivo de este trabajo fue...
Poster
Full-text available
Las hormigas cortadoras de hojas del genero Acromyrmex sp, son una de las principales plagas en los cultivos agrícolas y forestales. El control de esta plaga se realiza a través del uso de insecticidas químicos aplicados en polvo, líquidos o cebos, cuyos compuestos son altamente tóxicos para el ambiente y para los seres humanos. El objetivo del tra...
Article
Full-text available
Plant chemicals can affect reproductive strategies of tephritid fruit flies by influencing sex pheromone communication and increasing male mating competitiveness. We explored whether exposure of Anastrepha fraterculus males to guava fruit volatiles and to a synthetic blend of volatile compounds released by this fruit affects the sexual performance...
Conference Paper
Full-text available
Las hormigas cortadoras de hojas del género Acromyrmex y Atta son herbívoros que ocasionan grandes problemas en las plantaciones forestales. Particularmente, en el Delta del Paraná, donde existe una creciente producción forestal de Salicáceas, una de las plagas más importante son las hormigas del género Acromyrmex sp. En la búsqueda de herramientas...
Article
Plant genotype influences plant–herbivore interactions by affecting insect attraction, acceptance and development. Here we linked oviposition behaviour of the specialist willow sawfly Nematus oligospilus F örster ( H ymenoptera: T enthredinidae) with leaf traits on different Salix L . ( S alicaceae) genotypes. This was done as a first step to find...
Poster
Full-text available
El Delta del río Paraná es un ambiente de gran biodiversidad, que se caracteriza por la producción forestal de Salicáceas. Las hormigas cortadoras de hojas son plagas importantes en esta producción, ya que provocan gran defoliación tanto en "estaqueros" como en los individuos jóvenes. En la zona, el control de hormigas se realiza principalmente med...
Article
Experience-related plasticity is an essential component of networks involved in early olfactory processing. However, the mechanisms and functions of plasticity in these neural networks are not well understood. We studied nonassociative plasticity by evaluating responses to two pure odors (A and X) and their binary mixture using calcium imaging of o...
Article
Full-text available
Odors evoke complex spatiotemporal responses in the insect antennal lobe (AL) and mammalian olfactory bulb. However, the behavioral relevance of spatiotemporal coding remains unclear. In the present work we combined behavioral analyses with calcium imaging of odor induced activity in the honeybee AL to evaluate the relevance of this temporal dimens...
Article
Among numerous other factors, host-plant volatiles may affect selection of food plants by herbivorous insects. The blue willow leaf beetle, Phratora vulgatissima (L.) (Coleoptera: Chrysomelidae), is known to differentiate between willow species and genotypes. However, so far no knowledge is available on the physiological abilities of this leaf beet...
Article
Chrysomelidae are a taxon with an enormous plethora of highly specialised herbivorous species. The present study provides an overview of the knowledge available so far on cues guiding chrysomelids to locate a host plant. Host location behaviour wilt be addressed from different trophic perspectives. Cues from undamaged host plants are distinguished...

Citations

... Diachasmimorpha longicaudata (Ashmead) (Hymenop tera: Braconidae), the most widely used biocontrol agent against Tephritidae fruit fly pests (Dias et al., 2022), is central to the studies by Nussenbaum et al. (2024) and Devescovi et al. (2024), albeit from different perspectives. Nussenbaum et al. (2024) delve into the behavioral intricacies of D. longicaudata females, particularly their associative learning abilities regarding host habitat colors. ...
... Volatiles from Prunus cerasus are the main chemical signals used by Rhagoletis cerasi in seeking host plants (Būda et al. 2022). Anastrepha fraterculus males are sexually stimulated by the aroma of fruit of its native host Psidium guajava (guava) (Bachmann et al. 2023). Linalool acts as an oviposition deterrent on female Ceratitis capitata (Papanastasiou et al. 2020). ...
... Willow is a widespread tree throughout the world and is consumed extensively by various herbivores (Tahvanainen et al., 1985;Hallgren, 2003). Recent studies have shown that the egg deposition of Nematus oligospilus Förster (Hymenoptera, Tenthredinidae) on willow could increase the plant's jasmonic acid levels, alter its volatile profile, and reduce neonate larval growth (Davila et al., 2023). However, the effect of coleoptera egg deposition on willow trees and newborn larvae has not been reported. ...
... This contrasts with our previous results in laboratory tests, where we found that exposure to the volatiles of lemon fruit, lemon essential oil, and limonene resulted in a mating advantage in A. fraterculus males fed with non-hydrolysed brewer's yeast (Vera et al., 2013;Ruiz et al., 2021). Exposure to limonene volatiles also increased the sexual display of laboratory males under laboratory conditions (Belliard et al., 2022b). Possible differences between our previous study (Ruiz et al., 2021) and this work could be attributed to the fact that in the laboratory test, exposed males competed with non-exposed males from the same origin (laboratory strain), they had the same age and received the same diet, and the females were also from the same strain. ...
... All the remaining four species are considered major soybean stink bug pests in Brazil, whereas D. furcatus and D. melacanthus are also considered to be pests on corn and/or wheat. 22,23,36 The southern green stink bug (N. viridula), historically reported as a soybean key pest in Brazil, overall showed low abundance in soybean fields. ...
... F. (Rutaceae)] and guava (Psidium guava L.) produced an increase in male mating success (Vera et al., 2013). Exposure to guava volatiles also increased A. fraterculus male sexual display (Bachmann et al., 2015;Belliard et al., 2022a) and sex pheromone release (Bachmann et al., 2015). Exposure to volatiles from essential oils of C. limon and Schinus polygama (Cav.) ...
... The collected mites were artificially introduced in newly capped brood cells (6-day-old bee larvae) from honey bee colonies with low mite loads (LL) (three colonies) (Supplementary Figure 1). Each newly capped brood cell was opened with a scalpel at one edge of the wax cap and artificially infested with a single mite (foundress) using a fin paintbrush (Liendo et al. 2021). Subsequently, the cells were closed by gently pushing the capping back on the cell edge. ...
... Domiciano et al. (2004) analyzed the damages caused by Diceraeus sp. in maize and wheat and concluded that plants with low and medium damage (scores ˂ 4) presented higher recovery compared with severely damaged plants (scores ˃ 5), in accordance with our results. Failure to recover from damage in D. melacanthus-infested plants even after insect removal may be related to the metabolic cost involved in chemical defenses induced after stink bug attack or due to inter-plant competition for resources (Maddonni and Otegui, 2004;Jacobi et al., 2021), especially under greenhouse condition where the solar incidence is limited. Another hypothesis is that severely damaged plants have impaired development, tending to be dominated by larger plants (Maddonni and Otegui, 2004). ...
... It is worth noting that previous reports indicate that the reaction and metabolite production of endophytic fungi could be affected by season, host plant life cycle, and grass endophytic species. For example, a great difference was found between infected and uninfected grass-Epichloë endophyte associations in the profile of volatile organic compounds [58]. The chemical structures of Lolitrem B, the major toxin in the Lolitrem group and Ergovaline, are shown in Fig. 2. ...
... The study of an invasive aquatic species like I. pseudacorus is of particular relevance in Argentina given the importance of wetlands in this country, which cover 21% of its total area (Kandus et al. 2008) and occur across a wide variety of climate zones and ecoregions. Additionally, although the presence of I. pseudacorus has been reported by several authors in natural and artificial wetlands, including protected areas (Cordo 2004;Vega 2005;Depino 2011;Kalesnik 2001;Mariki et al. 2012;Perri et al. 2015;Delgado 2017;Jocou et al. 2018) its invasion history and current distribution in the country remain unknown. ...