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46 results for “Euschistus”
FIGURE 1 in Integrating data to redescribe Euschistus taurulus Berg (Hemiptera: Pentatomidae)
FIGURE 1 Stink bugs found in legume crops in Brazil, alive specimens. A: Adults of Euschistus taurulus, male (left) and female (right) in ventral view, showing color polymorphism; B: Similarity of adult females of Euschistus heros (left) and Dichelops melacanthus (right) to E. taurulus (middle); C and D: Adult female of E. taurulus; E: Adult female of E. heros; F: Adult male of D. melacanthus; G: Adult female of E. taurulus; H: Adult males of E. heros (left) and D. melacanthus (right). Photos: Fernando H. Iost Filho.
FIGURE 2 in Integrating data to redescribe Euschistus taurulus Berg (Hemiptera: Pentatomidae)
FIGURE 2. Adults of Euschistus taurulus Berg. A & C: Male in dorsal and ventral views, respectively; B & D: Female in dorsal and ventral views, respectively. Scale bar: 5 mm.
Supplementary Information - Chapter 1. Transcriptomic investigation of the molecular mechanisms underlying resistance to the neonicotinoid thiamethoxam and the pyrethroid lambda-cyhalothrin in Euschistus heros (Hemiptera: Pentatomidae)
<p><span>Laboratory-selected resistant strains of <em>Euschistus heros</em> to thiamethoxam (NEO) and lambda-cyhalothrin (PYR) were recently reported in Brazil. However, the mechanisms conferring resistance to these insecticides in <em>E. heros</em> remain unresolved. We utilized comparative transcriptome profiling and single nucleotide polymorphism (SNP) calling of susceptible and resistant strains of <em>E. heros</em> to investigate the molecular mechanism(s) underlying resistance.</span><span> </span><span>The <em>E. heros</em> transcriptome was assembled, generating 91 673 transcripts with a mean length of 720 bp and N50 of 1795 bp. Comparative gene expression analysis between the susceptible (SUS) and NEO strains identified 215 significantly differentially expressed (DE) transcripts. DE transcripts associated with the xenobiotic metabolism were all up-regulated in the NEO strain. The comparative analysis of the SUS and PYR strains identified 204 DE transcripts, including an esterase (esterase FE4), a glutathione-<em>S</em>-transferase, an ABC transporter (ABCC1) and aquaporins that were up-regulated in the PYR strain. We identified 9588 and 15 043 nonsynonymous SNPs in the PYR and NEO strains. One of the SNPs (D70N) detected in the NEO strain occurs in a subunit (α5) of the nAChRs, the target site of neonicotinoid insecticides. Nevertheless, this residue position in α5 is not conserved among insects.</span><span> </span><span>Neonicotinoid and pyrethroid resistance in laboratory-selected <em>E. heros</em> is associated with a potential metabolic resistance mechanism by the overexpression of proteins commonly involved in the three phases of xenobiotic metabolism. Together these findings provide insight into the potential basis of resistance in <em>E. heros</em> and will inform the development and implementation of resistance management strategies against this important pest.</span></p> <p><strong><span>*Published in: </span></strong><em><span>Pest Management Science</span></em><span><span> 79.12 (2023): 5349-5361</span>. <a href="https://doi.org/10.1002/ps.7745">https://doi.org/10.1002/ps.7745</a></span></p>
Figs. 2-10 in Nova espécie de Euschistus (Mitripus) da Argentina e sul do Brasil (Hemiptera, Pentatomidae, Pentatominae)
Figs. 2-10. Euschistus irroratus sp. nov.: 2, cabeça e pronoto, vista dorsal; 3, pigóforo, dorsal; 4, parâmero direito, vista lateral externa; 5, pigóforo, ventral; 6-8, phallus, respectivamente ventral, dorsal, lateral; 9, placas genitais; 10, laterotergitos 9, gonocoxitos 9, gonapófises 9 e vias genitais ectodérmicas (bv, bordo ventral; ca, carena; cd, conetivo dorsal; ch, chitinellipsen; cj, conjuntiva; cs, capsula seminalis; dr, ductus receptaculi; eiv, espessamento da intima vaginal; ejr, ejaculatory reservoir; g9, gonapófises 9; gc8, gonocoxito 8; gc9, gonocoxitos 9; la8, laterotergito 8; la9, laterotergito 9; me, membramblase; par, parâmero; pc, processus capitati; pht, phallotheca; pi, pars intermedialis; prpht, processus phallothecae; pt, ponticulus transversalis; v, vésica; x, décimo segmento). Escalas: Figs. 2, 3, 5, 9, 10, 1 mm; Figs. 4, 6-8, 0,5 mm.
Figure 4 in Assessment of entomopathogenic nematodes and their symbiotic bacteria to control the stink bugs Euschistus heros and Dichelops melacanthus (Heteroptera: Pentatomidae) in the soybean-corn succession system
Figure 4. Corrected mortality of Euschistus heros (Abbott formula) 7 days after its exposition to Steinernema diaprepesi AM163 at the rates of 0.7, 3.5, 17.6, 88.4 and 442.32 IJs/cm2. Curve generated by logarithm regression between rates and mortalities.
Figure 2. a in Assessment of entomopathogenic nematodes and their symbiotic bacteria to control the stink bugs Euschistus heros and Dichelops melacanthus (Heteroptera: Pentatomidae) in the soybean-corn succession system
Figure 2. a) Euschistus heros adults killed by Steinernema diaprepesi, b) nematodes emerging from the insect's cadaver.
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