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Parasitismo de percevejos-praga do maracujazeiro no Brasil por Hexacladia smithii Ashmead (Hymenoptera: Encyrtidae)
Baldin, Edson L L;Fujihara, Ricardo T;Boi?a JR, Arlindo L;Almeida, Maria C de;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000200025
Abstract: we describe the new association of hexacladia smithii (ashmead) parasitizing two passion fruit bugs, holhymenia histrio (fabricius) and anisoscelis foliacea marginella (dallas) (hemiptera: coreidae), in brazil.
Danos causados à soja por adultos de Euschistus heros (Fabricius) (Hemiptera: Pentatomidae), sadios e parasitados por Hexacladia smithii ashmead (Hymenoptera: Encyrtidae)
NUNES, MARIA C.;CORRêA-FERREIRA, BEATRIZ S.;
Neotropical Entomology , 2002, DOI: 10.1590/S1519-566X2002000100015
Abstract: damage on soybean [glycine max (l.) merrill] caused by euschistus heros (fabricius) parasitized by hexacladia smithii ashmead was studied in greenhouse. soybean plants, cultivar br-37, were covered with nylon screen net and artificially infested with two bugs/plant, for a 15-day period, from the stage corresponding to the end of pod development (r4) up to filled seeds (r5-r6). plants infested by non-parasitized bugs were compared with plants infested by bugs parasitized by h. smithii and with non-infested plants (control), with 20 replicates per treatment. the yield (g/plant), total number of pods and number of failed pods per plant did not differ between plants attacked by non-parasitized as well as by parasitized bugs, but they both differed from the control. similarly, the qualitative analysis of seeds (good, medium and bad) and the tetrazolium test (punctured seeds, damaged seeds and vigor) demonstrated the same effect. however, the germination potentiality of the seeds attacked by parasitized bugs was higher than those seeds attacked by non-parasitized ones, indicating that a lower damage was caused by parasitized bugs.
Desempenho alimentar e sobrevivência de Euschistus heros parasitado por Hexacladia smithii em sementes de soja
Nunes, Maria Clarice;Corrêa-Ferreira, Beatriz Spalding;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002000900003
Abstract: the influence of the parasitoid hexacladia smithii ashmead (hymenoptera: encyrtidae) on the feeding activity and on survival of the neotropical brown stink bug, euschistus heros (fabricius) (hemiptera: pentatomidae), was evaluated in laboratory, at 10, 20, 30 and 40 days after parasitism. the feeding activity was evaluated through the number of stylet sheaths deposited on soybean seeds, glycine max (l.) merrill (fabaceae), after feeding for 48 hours. the tests were conducted under controlled conditions of temperature (25±2°c), rh (65±10%) and photoperiod (14l:10d). at the beginning of the development of h. smithii the feeding activity of non-parasitized and parasitized bugs was similar; however, the number of stylet sheaths was two times greater in seeds fed upon by parasitized stink bugs than those fed upon by non-parasitized bugs, for males and females 30 days after parasitism. the survival of parasitized adults was smaller than that of non-parasitized adults, reaching 100% of the bugs died after 40 and 50 days of parasitism. the reduction in the survival of the stink bugs parasitized by h. smithii and the similar feeding activity among parasitized and non- parasitized bugs during almost the whole period of development of the parasitoids, put in relief the contribution of that parasitism to the reduction of the population of neotropical brown stink bug e. heros.
Ocorrência do parasitóide Hexacladia smithii Ashmead em adultos de Euschistus heros (F.) no Brasil
Corrêa-Ferreira, Beatriz S.;Nunes, Maria C.;Uguccioni, Luzilene D.;
Anais da Sociedade Entomológica do Brasil , 1998, DOI: 10.1590/S0301-80591998000300022
Abstract: parasitism of euschistus heros (f.) adults was studied in londrina, pr. twenty males and 20 females were collected each week from november 1996 to december 1997. in the laboratory, adults were sexed and maintained in plastic box (12 x 12 cm) with humidity and soybean pods as food, and observed daily during 30 days. the encyrtid hexacladia smithii ash. was observed attacking the bugs, being the first register of parasitism by hexacladia in this host. the natural incidence of parasitism varied from 0.6% to 39.5%. higher abundance of the parasitoid occurred during december and january and it was drastically reduced (<1%) from may to september. males and females were equally attacked by the parasitoid (14.7% and 11.9%, respectively). h. smithii is a gregarious endoparasitoid that completed its development inside the host body. adults emerged through a hole in the ventral or dorsal surface of the abdomen. from 2 up to 39 parasitoids were observed to emerge from a single adult e. heros.
Desempenho alimentar e sobrevivência de Euschistus heros parasitado por Hexacladia smithii em sementes de soja
Nunes Maria Clarice,Corrêa-Ferreira Beatriz Spalding
Pesquisa Agropecuária Brasileira , 2002,
Abstract: Avaliou-se, em laboratório, a influência do parasitóide Hexacladia smithii Ashmead (Hymenoptera: Encyrtidae) na atividade alimentar e sobrevivência de Euschistus heros (Fabricius) (Hemiptera: Pentatomidae), aos 10, 20, 30 e 40 dias após o início do parasitismo. A atividade alimentar foi avaliada pelo número de bainhas constatadas nas sementes de soja, Glycine max (L.) Merrill (Fabaceae), em 48 horas de alimenta o. O teste foi mantido sob condi es controladas de temperatura (25±2°C), umidade (65±10%) e fotoperíodo (14L:10E). No início do desenvolvimento de H. smithii a atividade alimentar dos percevejos n o-parasitados e parasitados foi semelhante, obtendo-se, entretanto, duas vezes mais bainhas alimentares depositadas/gr o pelos machos e fêmeas, após 30 dias de parasitismo. A sobrevivência dos percevejos parasitados foi menor que a dos percevejos n o-parasitados, alcan ando 100% de mortalidade 40 a 50 dias após o início do parasitismo. A redu o na sobrevivência dos percevejos parasitados por H. smithii e a atividade alimentar, semelhante a dos percevejos n o-parasitados durante quase todo o período de desenvolvimento do parasitóide, destacam a contribui o desse parasitismo na redu o da popula o do percevejo-marrom E. heros.
Novos hospedeiros para Hemencyrtus herbertii Ashmead (Hymenoptera: Encyrtidae) coletados em Lavras, Minas Gerais
Marchiori, C.H.;Silva, C.G.;Torres, L.C.;Bonani, J.P.;Amaral, B.B.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2006, DOI: 10.1590/S0102-09352006000500041
Abstract: this study verified the host species of the parasitoid hemencyrtus herbertii ashmead (hymenoptera: encyrtidae), in lavras, minas gerais, brazil. the pupae were obtained by the flotation method. they were individually placed in gelatin capsules until the emergence of adult flies or their parasitoids. the overall occurence of parasitism was 6.5%. the occurrence of parasitism presented in the hosts chrysomya megacephala (diptera: calliphoridae) and sarcodexia lambens (diptera: sarcophagidae) was 1.3% and 29.4%, respectively.
Hemencyrtus herbertii Ashmead (Hymenoptera: Encyrtidae) como parasitóides de dípteros muscóides coletados em Itumbiara, Goiás
Marchiori, C.H.;Silva Filho, O.M.;Pereira, L.A.;Ribeiro, L.C.S.;Borges, V.R.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2004, DOI: 10.1590/S0102-09352004000500021
Abstract: this study determined the species of hosts of the parasitoid hemencyrtus herbertii ashmead (hymenoptera: encyrtidae) in human feces, cattle liver and chicken viscera, collected in itumbiara, goias. the pupae were obtained by the flotation method. they were individually placed in gelatin capsules until the emergence of adult flies or their parasitoids. the overall prevalence of parasitism was 23.7%.
Encontro do parasitóide Tachinaephagus zealandicus (Ashmead) (Hymenoptera: Encyrtidae) em pupas de Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae) em carca?a de rato
Moretti, T.C.;Ribeiro, O.B.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2006, DOI: 10.1590/S0102-09352006000100022
Abstract: this study reports the occurrence of tachinaephagus zealandicus (ashmead) (hymenoptera: encyrtidae) parasitizing pupae of chrysomya megacephala (fabricius) (diptera: calliphoridae) associated with a decomposing rat carcass in a secondary wood area in campinas, sp. the parasitism rate was 91.8%.
Parasitismo e sítios de diapausa de adultos do percevejo marrom, Euschistus heros na regi?o da Grande Dourados, MS
Godoy, Karlla Barbosa;ávila, Crébio José;Duarte, Marcela Marcelino;Arce, Carla Cristina Marques;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010005000074
Abstract: among the insects that attack soybeans, brown stink bug euschistus heros (fabricius) is considered a major pest. the aim of this research was to evaluate the occurrence of parasitism in adults of brown stink bugs e. heros during soybean crop season and to identify diapause sites during the period of soybean absence in the great region of dourados, ms. adults of brown stick bugs were collected weekly in soybean crops during the 2004/05 and 2005/06 growing seasons. in the off-season soybean in 2005 and 2006 inspections were conducted in different environments to find possible sites of bugs' diapause , and to evaluate the occurrence of parasitism in these environments. for each sampling date, 40 adults were put inside one gerbox, fed with ligustrum lucidum ait. (oleraceae), and observed for a period of 40 days. parasitoids were kept in alcohol 70% and send to identification. the natural incidence of parasitism of adults collected in the period with and without soybean crops varied from 0.0% and 5.0%, and considering different samples, hexacladia smithii ashmead (hymenoptera: encyrtidae) was the only one parasitoid found. during the period of soybean absence was observe the highest incidence of e. heros on dry fallen leaves of mangifera indica l., showing that this environment is an important diapause sites for this pest in this region.
Diapausa e diferentes formas sazonais em Euschistus heros (Fabr.) (Hemiptera: Pentatomidae) no Norte do Paraná
Mour?o, Ana P. M.;Panizzi, Ant?nio R.;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000200002
Abstract: the neotropical brown stink bug, euschistus heros (fabr.), was collected on sunflower [helianthus annuus (l.)], soybean [glycine max (l.) merrill], star bristle [acanthospermum hispidum (dc.)], and under fallen leaves of mango tree [mangifera indica (l.)] and privet (ligustrum lucidum ait.), during one year, to evaluate the diapause incidence and the occurrence of different seasonal morphs. the majority of the insects (ca. 90%) with mature reproductive organs was observed during the summer (december-march), when e. heros was found on soybean or on sunflower; in the beginning of autumn, most insects (87%) showed immature reproductive organs, and they were found on star bristle and under fallen leaves. bugs with mature reproductive organs had more developed shoulders (3.23 and 3.27 mm, for males and females, respectively) than bugs with immature organs (2.91 and 2.89 mm, for males and females, respectively). two distinct body colors, dark brown and reddish brown, were observed. nevertheless, the reddish brown was the predominant color of both mature and immature adults during all year. adults were parasitized by hexacladia smithii (ashmead) (hymenoptera: encyrtidae) and tachinidae mainly trichopoda giacomellii (blanchard) (diptera: tachinidae) (80% and 40% of parasitism in male and female, respectively) during summer (december), when the bugs colonized sunflower. in soybean, 12% of males and 10% of females were parasitized, whereas in fallen leaves, the parasitism rate was 5% in both sexes.these results showed that in autumn/winter (shorter photoperiod) the majority of the insects were inactive under fallen leaves, showing immature reproductive organs and less developed shoulders, indicating that, at this time, these bugs were in diapause.
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