scholarly journals No impact of Bt soybean that express Cry1Ac protein on biological traits of Euschistus heros (Hemiptera, Pentatomidae) and its egg parasitoid Telenomus podisi (Hymenoptera, Platygastridae)

2014 ◽  
Vol 58 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Gabriela Vieira Silva ◽  
Amarildo Pasini ◽  
Adeney de Freitas Bueno ◽  
Orcial Ceolin Bortolotto ◽  
Gustavo Caselato Barbosa ◽  
...  
2020 ◽  
Vol 137 ◽  
pp. 105310
Author(s):  
Adeney de Freitas Bueno ◽  
Érica Caroline Braz ◽  
Bruna Magda Favetti ◽  
José de Barros França-Neto ◽  
Gabriela Vieira Silva

2006 ◽  
Vol 41 (7) ◽  
pp. 1093-1098 ◽  
Author(s):  
Cleonor Cavalcante Silva ◽  
Maria Carolina Blassioli Moraes ◽  
Raúl Alberto Laumann ◽  
Miguel Borges

The objective of this work was to study the foraging behavior of Telenomus podisi Ashmead (Hymenoptera: Scelionidae) in the presence of stimuli from its host, Euschistus heros (Heteroptera: Pentatomidae). The stimuli selected were: egg mass; virgin males and females; volatile extracts of sexually mature males and females; components of male sex pheromone; a component of the alarm pheromone, hexane and an empty cage as control. In a closed arena, the parasitoids were given the choice between single and combined stimuli presented to them simultaneously. To find the host egg, T. podisi primarily uses the sensory cues released from the male insects. The orientation toward odors of male chemical extract indicates that a source of kairomone was detected. Gas chromatographic analyses of this substance showed peak of methyl 2,6,10-trimethyltridecanoate, the main component of male sexual pheromone. The sensory response to methyl 2,6,10-trimethyltridecanoate confirms that this compound may act as a kairomone to find host eggs. Females and egg mass stimuli were weakly attractive to the parasitoid.


2020 ◽  
Vol 110 (5) ◽  
pp. 638-644
Author(s):  
R. Tognon ◽  
J. Sant'Ana ◽  
M. F. F. Michereff ◽  
R. A. Laumann ◽  
M. Borges ◽  
...  

AbstractTelenomus podisi Ashmead (Hymenoptera: Scelionidae) is the most important egg parasitoid of Euschistus heros (Fabricius) (Hemiptera: Pentatomidae), and its successful parasitism is related to their searching ability to find suitable hosts under a complex chemical environment using host-reliable cues. Thus, the objective of this study was to elucidate chemical substances on the external layer of E. heros eggs and report its potential kairomonal activity on T. podisi. We tested female wasps in olfactometer system to synthetic compounds obtained from a chemical identification of E. heros egg masses. The synthetic blend was also evaluated in parasitism tests under laboratory and semi-field conditions. We identified 31 substances from egg surface extracts, including monoterpenes, aldehydes and alkanes. Among those compounds, a synthetic solution including camphene, β-pinene, limonene and benzaldehyde-induced chemotaxic behaviour on the wasps and increased the parasitism on E. heros eggs, either in laboratory or semi-field test, suggesting its potential use to T. podisi manipulation and parasitism improvement.


2008 ◽  
Vol 43 (5) ◽  
pp. 575-580 ◽  
Author(s):  
Cleonor Cavalcante Silva ◽  
Raul Alberto Laumann ◽  
Maria Carolina Blassioli ◽  
Martin Pareja ◽  
Miguel Borges

The objective of this work was to improve the mass rearing technique of Euschistus heros in laboratory. Nymphs and adults were reared at densities 100, 200, 300 and 400 eggs per Petri dish (9 cm diameter), and at 50, 100, 150 and 200 couples per rearing cages (900 mL), respectively. Survival rate of immature stages and survivorship and reproduction of adults were determinated. Survivorship of nymph to adult was the highest (89%) at density 100 eggs per dish. Adult survivorship was independent of density, and 100 couples per cage were the best to improve quality of the produced progeny. In these conditions, fecundity was 160.8±9.28 eggs per female, and a total of 8,950±456 eggs per cage per month was produced. Two hundred couples per cage showed a negative effect on reproduction, which decreased to 65%. With this technique, a colony of 35 cages with 100 couples per cage yields about 313.3 thousands eggs per month, which is enough to supply the egg parasitoid Telenomus podisi to colonize about 35 ha of soybean field.


2016 ◽  
Vol 10 (5) ◽  
pp. 419-428 ◽  
Author(s):  
Aline Moreira Dias ◽  
Martín Pareja ◽  
Maycon Laia ◽  
Maria Carolina Blassioli-Moraes ◽  
Miguel Borges ◽  
...  

1998 ◽  
Vol 27 (4) ◽  
pp. 585-591 ◽  
Author(s):  
Deoclecio J. P. Pacheco ◽  
Beatriz S. Corrêa-Ferreira

O potencial reprodutivo e a longevidade do parasitóide de ovos Telenomus podisi Ashmead foram estudados, em laboratório, em ovos dos percevejos hospedeiros Euschistus heros (F.), Piezodorus guildinii (West.) e Nezara viridula (L.). A capacidade reprodutiva e a longevidade de fêmeas de T. podisi foram significativamente diferentes nas três espécies de percevejos. A maior produção de descendentes por fêmea ocorreu nos primeiros 10 dias de vida, em ovos de E. heros e P. guildinii. O parasitismo em N. viridula foi muito baixo (8,1%) e somente cinco indivíduos completaram seu desenvolvimento. Fêmeas jovens geraram maior número de fêmeas do que de machos, ocorrendo proporção inversa com o avanço da idade da fêmea. A razão sexual do parasitóide quando desenvolvido em E.heros e P. guildinii foi de 0,67 e 0,61 e a fertilidade média da fêmea durante a sua vida reprodutiva foi de 211,0 e 76,1 descendentes, respectivamente. A longevidade das fêmeas de T. podisi foi diferente em cada espécie hospedeira, vivendo, em média, 19,9, 30,9 e 40,6 dias quando parasitaram ovos de P. guildinii, E. heros e N. viridula, respectivamente. Os machos, entretanto, tiveram sempre longevidade maior em relação às fêmeas, apresentando um tempo de vida semelhante nos três hospedeiros (32,0, 34,5 e 43,5 dias, respectivamente). Os resultados sugerem que E. heros e P. guildinii são os hospedeiros mais adequados ao desenvolvimento de T. podisi.


PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9667
Author(s):  
Giacomo Ortis ◽  
Serguei V. Triapitsyn ◽  
Giacomo Cavaletto ◽  
Isabel Martinez-Sañudo ◽  
Luca Mazzon

The little known fairyfly (Hymenoptera, Mymaridae), Platystethynium (Platystethynium) triclavatum (Donev & Huber, 2002), comb. n. from Pseudocleruchus Donev & Huber, 2002, is newly recorded as an egg parasitoid of Barbitistes vicetinus Galvagni & Fontana, 1993 (Orthoptera, Tettigoniidae). This bush-cricket is endemic to northeastern Italy (mainly Euganean Hills of Veneto Region), where it has recently become an economically significant agricultural and forest pest. Data on discovery, distribution, and some remarkable biological traits of this gregarious egg parasitoid are presented. Its identification and availability of many well-preserved fresh specimens have made possible to re-define Pseudocleruchus Donev & Huber, 2002 syn. n., with type and the only described species Pseudocleruchus triclavatus Donev & Huber, 2002, as a synonym of Platystethynium Ogloblin, 1946 and its nominate subgenus, P. (Platystethynium), and also to describe the brachypterous male of P. (Platystethynium) triclavatum. It is the first known male for the entire genus. Enlarged mandibles of the megacephalous males are used to chew holes in the hard chorion of the host egg, allowing fully winged females, whose mandibles are strongly reduced and do not cross over, to emerge after mating with the males inside it. Up to 136 individual parasitoids (about 77 on average) can hatch from a single egg of B. vicetinus, with their sex ratio being strongly female biased (80–97% females per egg).


2021 ◽  
Author(s):  
Mariana Abreu Costa ◽  
Elizeu Sá Farias ◽  
Eliana Donizete Andrade ◽  
Vinícius Castro Carvalho ◽  
Geraldo Andrade Carvalho

Abstract The egg parasitoid Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) regulates lepidopteran pest populations in cotton crops. However, cotton harbors dozens of pests, and growers rely on multiple insecticide applications to manage these damaging organisms. A harmonious integration of control tactics is required for proper pest management, and the use of selective insecticides (i.e., those promoting effective pest control while causing little impact on natural enemies) fits within this scope. This study aimed to assess the lethal, sublethal and transgenerational effects of insecticides from varying chemical groups on T. pretiosum. The insecticides were sprayed on parasitized host [Ephestia kuehniella (Zeller)] eggs with developing T. pretiosum stages (egg-larva, prepupa and pupa), and biological traits were assessed following adult emergence. Overall, pupae were more susceptible to the insecticides. We found thiodicarb and chlorfenapyr to reduce F0 adult emergence in rates comparable to the positive control (methomyl). Adult F0 deformation was the highest on flupyradifurone-treated organisms, and both the F0 parasitism rate and female survival were reduced by the insecticides (except for teflubenzuron). The sex ratio was affected by thiodicarb and flupyradifurone. Transgenerational effects occurred on adult emergence, which was reduced on the offspring (F1) of thiodicarb-, chlorfenapyr-, and flupyradifurone-treated T. pretiosum. In addition, thiodicarb lessened the F1 sex ratio. Combined, these results indicate that teflubenzuron is the safest insecticide; the other insecticides (especially thiodicarb and chlorfenapyr) are non-selective to T. pretiosum. Field and semifield studies are required to confirm the harmfulness of thiodicarb and chlorfenapyr towards T. pretiosum.


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