piezodorus guildinii
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2021 ◽  
Vol 87 ◽  
pp. 503-521
Author(s):  
Sarah Birkmire ◽  
Cory Penca ◽  
Elijah J. Talamas ◽  
Matthew R. Moore ◽  
Amanda C. Hodges

Psix striaticeps (Dodd) is an egg-parasitoid wasp previously known only from the Old World. We report this species from twelve counties in Florida, which are the first records in the Western Hemisphere. It was collected in yellow cylinder traps and reared from the eggs of three stink bug species: Nezara viridula L., Chinavia marginata (Palisot de Beauvois), and Piezodorus guildinii (Westwood). A COI barcode analysis found a 100% match between the Floridian population and a specimen from South Africa. The prospects of using Ps. striaticeps as a biological control agent against exotic stink bugs are discussed.


2021 ◽  
Vol 12 ◽  
Author(s):  
Matheus Sartori Moro ◽  
Xing Wu ◽  
Wei Wei ◽  
Lucas William Mendes ◽  
Kerry Clint Allen ◽  
...  

Background: Herbivorous insects are one of the main biological threats to crops. One such group of insects, stink bugs, do not eat large amounts of tissue when feeding on soybean, but are damaging to the quality of the seed yield as they feed on green developing seeds leading to poorly marketable harvests. In addition to causing physical damage during sucking-feeding activities, the insects can also transmit microbial pathogens, leading to even greater yield loss. Conducting surveys of the insect intestinal microbiome can help identify possible pathogens, as well as detail what healthy stink bug digestive systems have in common.Methods: We used the conserved V4 region of the 16S rRNA gene to characterize the bacterial microbiome of the red-banded stink bug Piezodorus guildinii collected in Brazil and the United States, as well as the neotropical brown stink bug Euschistus heros collected in Brazil.Results: After quality filtering of the data, 192 samples were kept for analyses: 117 samples from P. guildinii covering three sites in Brazil and four sites in the United States, and 75 samples for E. heros covering 10 sites in Brazil. The most interesting observations were that the diversity and abundance of some bacterial families were different in the different ecoregions of Brazil and the United States.Conclusion: Some families, such as Acetobacteraceae, Bacillaceae, Moraxellaceae, Enterobacteriaceae, and Rhodocyclaceae, may be related to the better adaptation in some localities in providing nutrients, break down cellulose, detoxify phytochemicals, and degrade organic compounds, which makes it difficult to control these species.


2021 ◽  
Author(s):  
Omaththage P. Perera

Abstract Objective: The redbanded stink bug, Piezodorus guildinii (Hemiptera: Pentatomidae), is native to Caribbean Basin and is currently considered an invasive pest in Florida, Louisiana, Mississippi, and Texas in the southern United States. Although P. guildinii is an economically important invasive pest in the USA, a relatively few studies have been conducted to understand genetic, population genetic structure, and genetic basis of resistance to insecticides. The objective of this work was to obtain a high-quality genome assembly to develop genetic resources to conduct genetic, population genetic, and physiological studies of the RBSB. Results: The genome of RBSB was sequenced with Pacific Biosciences technology followed by two rounds of scaffolding using Chicago libraries and HiC proximity ligation to obtain a high-quality assembly. The genome assembly contained 800 scaffolds larger than 1 kbp and the N50 was 170.84 Mbp. The largest scaffold was 222.22 Mbp and 90% of the genome was included in the 7 scaffolds larger than 1 Mbp. The number of megabase scaffolds also matched the number of chromosomes in this insect. The genome sequence will facilitate the development of resources to conduct studies on genetics, transcriptomics, and physiology of RBSB.


2021 ◽  
Author(s):  
Lucia Sessa ◽  
Nicolas Pedrini ◽  
Nora Altier ◽  
Eduardo Abreo

Insect Epicuticle hydrocarbons (CHC) are known to be important determinants in the susceptibility degree of insects to fungal entomopathogens. Five Beauveria bassiana isolates were phenotypically analyzed regarding their response to CHC nutrition and their pathogenicity and virulence towards high fungal-susceptible Thaumastocoris peregrinus and low fungal-susceptible Piezodorus guildinii, which are important hemipteran pests in eucalyptus and soybean plantations, respectively. Two of these isolates, resulting the most (ILBB308) and the least (ILBB299) virulent to P. guildinii, were also evaluated at gene expression level after growth on n-pentadecane. B. bassiana most virulent isolate ILBB308 showed the lowest growth on most evaluated CHC media. However, this isolate distinctively induced most of the analyzed genes involved in CHC assimilation, cuticle degradation and stress tolerance. Virulence towards low susceptibility P. guildinii was enhanced in both hypervirulent ILB308 and hypovirulent ILBB299 isolates after growth on n-pentadecane as the sole carbon source, whereas virulence enhancement towards high susceptibility T. peregrinus was not observed in alkane-grown fungi. Virulence enhancement towards P. guildinii could be mostly explained by a priming effect produced by CHC on the induction of some genes related to hydrocarbon assimilation in ILB 205 and ILB 308, such as hydrophobin (Bbhyd2) and cytochrome P450 genes (BbCyp52g11 and BbCyp52x1), and partially by the induction of genes related to cuticle degradation (Bbchit and Bbcdep1) and stress tolerance (Bbsod1) observed only in ILB308.


2021 ◽  
Vol 23 (1) ◽  
pp. 27
Author(s):  
Putri Mustika Sari ◽  
Adriansyah Yoesoep ◽  
Lisdayani Lisdayani

<p>Plants that have a wide range of insect presence, decreased insect diversity and abundance were so few consequenced because the absence of one insect species can be replaced by the presence of another. The bad consequences that occur are the types of plants that have specific insect specificities because the absence of these insects will cause the failure of plant pollination and will directly cause a decrease in crop production. This study aimed to determine the diversity of insect species that come in the soybean-tithonia intercropping. The method was used direct observation in tithonia-soybean intercropping, took insects using a sweep net in the morning. The results showed that there were 15 types of insects identified, namely <em>Epilachna</em> sp.; <em>Coccinella</em> <em>sexmaculata</em>; <em>Coccinella</em> <em>transveralis</em>; <em>Verania lineata; Ropalidia fasciata; Priocnemis</em> sp.; <em>Naupactus leucoloma; Piezodorus guildinii</em>; <em>Bemicia</em> <em>tabaci; Agromyza phaseoli; Spodoptera</em> sp.; <em>Nezara viridula; Paederus fusipes; Hylaeus</em> sp.; and <em>Trigona</em> sp. The range of results of the calculation of the diversity index showed that the five treatments in intercropping plants had the same abundance. So it was needed to calculate the highest diversity index value or maximum H expressed in Ln S. The maximum H value in this study is 2.708, which is a measure of moderate species diversity (1&lt;H’&lt;3).</p>


2021 ◽  
Author(s):  
Matheus Sartori Moro ◽  
Xing Wu ◽  
Wei Wei ◽  
Lucas William Mendes ◽  
Clint Allen ◽  
...  

Abstract Background: Herbaceous insects are one of the main biological threats to crops. One such group of insects, stink bugs, do not eat large amounts of tissue when feeding on soybean, but are extremely damaging to the quality of the seed yield as they feed directly on green developing seeds leading to poorly marketable harvests. In addition to causing physical damage to the seed during feeding, the insects can also transmit microbial pathogens, leading to even greater yield loss. Conducting surveys of the insect intestinal microbiome can help identify possible pathogens, as well as detail what healthy stink bug digestive systems have in common. Methods: We used the conserved V4 515-806 region of the 16S rRNA gene to characterize the bacterial microbiome of the red-banded stink bug Piezodorus guildinii collected in Brazil and the United States, as well as the neotropical brown stink bug Euschistus heros collected in Brazil. Results: After quality filtering of the data, 192 samples were kept for analyses: 117 samples from P. guildinii covering three sites in Brazil and four sites in the US, and 75 samples for E. heros covering 10 sites in Brazil. The most interesting observations were that the diversity and abundance of some bacterial families were different in the different ecoregions of Brazil and the United States. Conclusions: Some families may be related to the better adaptation in some localities in provide nutrients, break down cellulose, detoxify phytochemicals, and degrade organic compounds, which makes it difficult to control these species.


2021 ◽  
Author(s):  
Matheus Sartori Moro ◽  
Xing Wu ◽  
Wei Wei ◽  
Lucas William Mendes ◽  
Clint Allen ◽  
...  

Abstract Background: Herbaceous insects are one of the main biological threats to crops. One such group of insects, stink bugs, do not eat large amounts of tissue when feeding on soybean, but are extremely damaging to the quality of the seed yield as they feed directly on green developing seeds leading to poorly marketable harvests. In addition to causing physical damage to the seed during feeding, the insects can also transmit microbial pathogens, leading to even greater yield loss. Conducting surveys of the insect intestinal microbiome can help identify possible pathogens, as well as detail what healthy stink bug digestive systems have in common.Methods: We used the conserved V4 515-806 region of the 16S rRNA gene to characterize the bacterial microbiome of the red-banded stink bug Piezodorus guildinii collected in Brazil and the United States, as well as the neotropical brown stink bug Euschistus heros collected in Brazil.Results: After quality filtering of the data, 192 samples were kept for analyses: 117 samples from P. guildinii covering three sites in Brazil and four sites in the US, and 75 samples for E. heros covering 10 sites in Brazil. The most interesting observations were that the diversity and abundance of some bacterial families were different in the different ecoregions of Brazil and the United States.Conclusions: Some families may be related to the better adaptation in some localities in provide nutrients, break down cellulose, detoxify phytochemicals, and degrade organic compounds, which makes it difficult to control these species.


Author(s):  

Abstract A new distribution map is provided for Piezodorus guildinii Westwood. Hemiptera: Pentatomidae. Hosts: polyphagous, but especially soyabean (Glycine max), alfalfa (Medicago sativa) and other leguminous crops. Information is given on the geographical distribution in North America (Mexico, USA, Arkansas, Florida, Georgia, Louisiana, Mississippi, Missouri, New Mexico, South Carolina, Texas), Central America and Caribbean (Antigua and Barbuda, Barbados, Costa Rica, Cuba, Dominican Republic, Grenada, Guatemala, Honduras, Jamaica, Nicaragua, Puerto Rico, St. Vincent and Grenadines, Trinidad and Tobago), and South America (Argentina, Brazil, Acre, Goias, Mato Grosso, Mato Grosso do Sul, Minas Gerais, Parana, Rio Grande do Sul, Santa Catarina, Sao Paulo, Tocantins, Colombia, Galapagos Islands, Paraguay, Peru, Uruguay).


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