Macro-elements in the hemolymph of adult Euschistus heros (Fabr.) (Hemiptera: Pentatomidae) treated with pyriproxyfen

Cremonez, Paulo S. G.; Matsumoto, Janaina F.; Andrello, Avacir Casanova; Roggia, Samuel; Pinheiro, Daniela O.; Neves, Pedro Manuel Oliveira Janeiro

doi:10.1016/j.cbpc.2019.02.012

Cited by 6 publications

(8 citation statements)

References 60 publications

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“…The findings described here reinforce this hypothesis, as the selection for imidacloprid resistance revealed heavier E. heros males than females. Although the basis for such differences may require further investigation, it has been shown that E. heros males and females differ in the amount of macro‐elements in the hemolymph when challenged by insecticides (Cremonez et al, 2019), and other hemipteran pests show large differences in the storage and mobilization of fundamental biomolecules (Scheys et al, 2019, 2020). Such sex‐related parameters can be differentially affected by the intensity and type of insecticidal challenge, which is unbalanced by the physiological trade‐offs (e.g., energetic investments for reproduction or reserve accumulation) that lead to differential weight gains in males and females, but this needs further attention.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, male insects are usually smaller and play different adaptive roles than females (Field et al, 2015;Stillwell et al, 2010). Thus, it is reasonable to expect that sex-dependent physiological responses would shape the adaptive success of insects facing insecticidal challenges (Andreazza et al, 2020;Cremonez et al, 2019;Feng et al, 2019;Fujii et al, 2020;Haddi et al, 2016Haddi et al, , 2017. Here, although the continuous selection for PBO-synergized imidacloprid resistance led to providing both E. heros males and females with increased respiratory activities, previous investigations have shown that only E. heros males exhibited reduced respiratory activities when sublethally exposed to imidacloprid (Haddi et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

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Sex‐dependent body mass and respiratory responses on Euschistus heros individuals resistant to imidacloprid

Azevedo

Cunha

Mantilla‐Afanador

et al. 2022

Agri and Forest Entomology

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1. In insect-resistant populations, adaptive fitness is intimately related to the physiological responses of males and females to different stressors.2. By using laboratory-selected imidacloprid-resistant individuals of the Neotropical brown stink bug Euschistus heros, one of the most prevalent pests in soybean fields in the Neotropical region, we evaluated whether resistance to imidacloprid (synergized by piperonyl butoxide-PBO) would differentially affect the longevity, body mass and respiratory responses of E. heros males and females.3. We used an imidacloprid-susceptible E. heros strain (ImiSusc), whose individuals were reared under controlled and imidacloprid-free conditions for over a decade, to select the PBO-synergized imidacloprid-resistant strain (ImiPBOSel). 4. After eight generations using PBO-synergized imidacloprid, our results revealed that resistant individuals exposed only to dry residues of imidacloprid (tarsal contact) could survive at concentrations as high as 168 μg a.i./cm 2 , which is equivalent to 40-fold the label recommendation for field applications. Furthermore, ImiPBOSel males and females exhibited higher longevity, higher body mass and elevated respiratory activity than ImiSusc individuals. 5. Altogether, the findings described here showed that imidacloprid resistance can select E. heros individuals with better metabolic capacities, which can complicate the management of this pest under field conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Sex‐dependent body mass and respiratory responses on Euschistus heros individuals resistant to imidacloprid

Azevedo

Cunha

Mantilla‐Afanador

et al. 2022

Agri and Forest Entomology

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“…Pyriproxyfen functions as a JH analogue (IRAC group 7A), being classified as an insect growth regulator, also known as insect growth disruptor (IGD), and its application induces the JH presence in abnormal amounts that induces a non-controlled activity in the target insect (Pener & Dhadialla, 2012). It is known that secondary and tertiary effects of pyriproxyfen are related to other functions of JH in insects, such as vitellogenin metabolism, reproductive system structure, regulation of diapause, and hemolymph macro-element homeostasis (Cremonez et al, 2019b;Manaboon, Yasanga, Sakurai, & Singtripop, 2012;Guo et al, 2014). However, no direct action of this insecticide or the JH has been previously reported on the formation or the structuring of the CT proper, as indicated in this study.…”

Section: Discussionmentioning

confidence: 99%

“…The insecticide application was performed as described by Cremonez et al (2019b). Briefly, groups of 10 nymphs in the fourth stage (N4) were placed in glass Petri dishes (9 cm diam.)…”

Section: Application Of Treatmentsmentioning

confidence: 99%

Sublethal Concentration of Pyriproxyfen Reduces Testicular Connective Tissue Thickness in Euschistus heros Fabr. (Hemiptera: Pentatomidae)

Matsumoto¹,

Cremonez²,

Roggia³

et al. 2021

JAS

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The aim of this study was to determine the effect of the insecticide pyriproxyfen (Tiger™ 100 CE), juvenile hormone analogue, when applied in a sublethal LC30 concentration (0.668 mL a. i. L-1), on the morphological and morphometric parameters of external and internal connective tissue (CT) of the Neotropical-brown stink bug Euschistus heros testicles. The insecticide was applied on nymphs from the 4th instar using a Potter tower with a working pressure of 82.73 kPa (12 lb pol-²) and 1 mL of the emulsion per replicate. A completely randomized experimental design was used, consisting of two treatments (control and pyriproxyfen-treated), five repetitions, and 10 adults of E. heros per experimental unit. The insects were maintained under controlled conditions until the emergence of adults. After 48 h of emergence of adults, the testicles were collected, fixed, and processed for morphological and morphometric analyses. A change was observed in the collagen fibers of the CT of treated insects when compared with those of controls. It was also observed that both types of CT (dense irregular and loose) over the internal tunic of the treated insect were thinner than those in control insects. The analysis showed that pyriproxyfen significantly reduced the external and internal CT width and the conformation of its fibers in all the observed regions when compared with the controls; this may affect the production of the three different types of sperm present in this species.

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“…Somado a isso, surgiram restrições no número de moléculas para o manejo de percevejos na cultura. No cenário atual, inseticidas pertencentes aos grupos químicos dos neonicotinóides, piretróides, carbamatos e organofosforados estão disponíveis e são recomendados para o manejo de sugadores da soja(CREMONEZ et al, 2019). maioria dos trabalhos disponíveis na literatura se restringem a um local ou poucos inseticidas.…”

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Fatores ambientais e tempo de degradação foliar de neonicotinóides no controle químico de insetos sugadores em soja

Fonseca¹

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Macro-elements in the hemolymph of adult Euschistus heros (Fabr.) (Hemiptera: Pentatomidae) treated with pyriproxyfen

Cited by 6 publications

References 60 publications

Sex‐dependent body mass and respiratory responses on Euschistus heros individuals resistant to imidacloprid

Sex‐dependent body mass and respiratory responses on Euschistus heros individuals resistant to imidacloprid

Sublethal Concentration of Pyriproxyfen Reduces Testicular Connective Tissue Thickness in Euschistus heros Fabr. (Hemiptera: Pentatomidae)

Fatores ambientais e tempo de degradação foliar de neonicotinóides no controle químico de insetos sugadores em soja

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